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2024 Vol. 45 Issue 1

2024, Vol. 45, No. 1Catalogue

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Review
Research advances on endocarp development of walnut
WANG Fen, WU Ting, ZHANG Ping, ZHANG Qiang, LIU Li
2024, 45(1): 1-7.   doi: 10.12172/202303010001
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Abstract:
In this article, the main components of lignin, cellulose, brown pigment, and lignin during the development of walnut endocarp, as well as the influencing factors were summarized. Based on the induction, summary, and comparative analysis of relevant literature at home and abroad, the existing research were sorted out. The effects of lignin, cellulose and brown pigment, and the environmental factors of lignin synthesis during the development of walnut endocarp, the cloning and expression analysis of lignin synthesis-related enzymes and related genes during lignin metabolism were reviewed. It is expected that the research results will provide basic reference for the in-depth study of the formation mechanism of walnut endocarp and the formulation of reasonable breeding management measures in production practice to reduce the occurrence of kernel exposure and fruit cracking.
Research Reports
Effects of exogenous gibberellin on growth physiological indicators of Taxus wallichiana
GAO Wenyu, YANG Hong, XING Zhen, LIU Wenjie, LV Qingxin, GU Qi, YU Yingpeng
2024, 45(1): 8-14.   doi: 10.12172/202305130001
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Abstract:
In order to investigate the effects of spraying exogenous gibberellin (GA3) on the growth and physiological status of Taxus wallichiana. 5-year-old potted cuttings of Taxus wallichiana were used as experimental materials, and the leaves were sprayed with gibberellin of 0, 20, 40, 60, 80, and 100 mg·L−1 for 2 months. The plant height and ground diameter were measured regularly, and the contents of chlorophyll, malondialdehyde (MDA), proline (Pro) and superoxide dismutase (SOD) in leaves were measured at the end of the test. The results showed that: (1) With the increase of GA3 concentration, the growth of plant height and ground diameter of Taxus wallichiana showed a trend of first increasing and then decreasing, and the growth effect of 60 mg·L−1 treatment being was the best. (2) With the increase of GA3 concentration, the contents of chlorophyll a, chlorophyll b, and total chlorophyll showed a trend of first increasing and then decreasing, with the highest content of chlorophyll a and total chlorophyll was observed in the 60 mg·L−1 treatment, and the highest content of chlorophyll b was observed in the 40 mg·L−1 treatment, while the chlorophyll a content was much higher than the chlorophyll b content. (3) With the increase of GA3 concentration, the content of MDA increased first and then decreased, and the treatment of 60 mg ·L−1 was the highest, indicating the most severe stress. The contents of Pro and SOD decreased first and then increased, and both of which were the lowest in the treatment of 60 mg·L−1. In summary, the resluts showed that spraying exogenous GA3 could promote plant growth and chlorophyll accumulation during the transitional period from growth to dormancy of Taxus wallichiana. However, excessive concentration could stress the plant growth, leading to the increase of MDA content and the decrease of Pro and SOD contents in leaves, which would create stress and weaken stress resistance.
Research Reports
Temporal and spatial variation characteristics of surface evapotranspiration and drought in Sichuan Province from 2001 to 2020
WANG Xu, QIN Xiangyu, SU Zixin, WANG Xin, QING Lingxuan, XUE Feiyang, YANG Cunjian
2024, 45(1): 15-22.   doi: 10.12172/202306060001
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Abstract:
Based on the data of MODIS16, ET, PET and CLCD remote sensing products in Sichuan Province from 2001 to 2020, combined with water deficit index, coefficient of variation, trend analysis method and Mann-Kendall trend test, the spatio-temporal variation characteristics of ET, PET and CWSI was deeply explored in Sichuan Province. The changes of ET, PET and CWSI were analyzed based on different land use types. The results showed that ET showed no significant increase trend from 2001 to 2020, with an average annual increase of 6.7739 mm. The overall trend of PET generally showed an insignificant decrease trend, with an annual decrease of 5.1192 mm. The overall CWSI showed a significant decrease trend, with an average annual decrease of 0.0045. The average annual ET in Sichuan Province was from 0 to 1390 mm, most of the western plateau areas were high-value areas, while most of the Sichuan basin areas were low-value aeas. The variation trend was between −4 and 4.29 mm·a−1, showing a significant increase trend and low or low volatility. PET value was between 0 and 2550 mm, except for a few areas in central Sichuan Province, which are low-value, other areas are high-value. The variation trend was between −15.14 and 17.95 mm, and the overall trend was insignificant decreasing trend and low or high volatility. The CWSI value ranged from 0.066 to 0.917, with high values in the eastern and western parts of Sichuan Province and low values in the central part of Sichuan Province. The variation trend was between −0.0366 and 0.0208, showing a significant decreasing trend and low volatility.
Research Reports
Urban expansion and vegetation changes in built-up areas in Chengdu-Chongqing area from 2001 to 2020
XUE Feiyang, WANG Xin, QING Lingxuan, SU Zixin, YANG Cunjian
2024, 45(1): 23-32.   doi: 10.12172/202306020002
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Abstract:
Based on DMSP/OLS, NPP/VIRS nighttime lighting data, and SPOT/VEGETATION NDVI data, the spatial development mode and vegetation change characteristics of urban built-up areas in Chengdu-Chongqing area were studied, which provided reference for the optimization of urban layout and the maintenance of regional ecosystem. The boundary of urban built-up area in Chengdu-Chongqing area was extracted by statistical data comparison method, and the urban development was analyzed from the aspects of urban expansion characteristics and speed. Taking NDVI as an indicator of the vegetation status in urban built-up areas, the vegetation changes in Chengdu-Chongqing area from 2001 to 2020 were studied from the aspects of NDVI total, mean, interannual change rate, change percentage, and coefficient of variation. The results showed that the accuracy of the built-up areas extracted using statistical data comparison method was relatively high, and the error rate was less than 2%. The annual average speed of urban expansion was on the rise, and the urban expansion speed from 2015 to 2020 was 12.23 km2·a−1. The total NDVI of urban built-up areas first increased and then decreased with the increase of built-up areas. The vegetation condition improved from 2001 to 2010, but the vegetation began to deteriorate from 2010 to 2020. The vegetation condition in urban built-up areas was generally worse than that in background areas. The vegetation stability in urban built-up areas was poor, and the urban coefficient of variation increased in different degrees over the past 19 years.
Research Reports
Spatial and temporal evolution of vegetation and topographic differentiation in Minjiang River basin based on MODIS-NDVI
WANG Xin, XUE Feiyang, SU Zixin, QING Lingxuan, YANG Cunjian
2024, 45(1): 33-40.   doi: 10.12172/202306020001
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Abstract:
Minjiang River is one of the important branches of the Yangtze River system, which flows through the western Sichuan Plateau and the Sichuan Basin. As one of the important ecological indicators, studying the spatial and temporal variation of vegetation in Minjiang River basin will help to understand the ecological environment of the basin and provide reference for subsequent ecological management. Based on the MODIS-NDVI dataset and DEM data of Minjiang River basin from 2003 to 2021, the spatial and temporal evolution of vegetation cover in the Minjiang River basin and the influence of topographic factors on its change trend by means of spatial analysis techniques, Hurst index, linear trend analysis and coefficient of variation were analyzed. The results showed that: (1) The average NDVI value ranged from 0 to 0.9 during the study period. The NDVI value in the upper and middle reaches of the river basin were higher than that in the lower reaches, and the overall vegetation cover of the Minjiang River basin showed a fluctuating upward trend with a growth rate of 2.4%/10 a. (2) The areas with increasing and decreasing vegetation cover in the Minjiang River basin accounted for 84.49% and 15.51%, respectively. The valley areas of the western Sichuan Plateau and the non-urban areas of the Sichuan basin showed a significant increasing trend. Those with decreasing trends were mainly located in the new urban areas of Chengdu city expanding outward, Meishan city and Deyang city. (3) The areas with high volatility were mainly distributed in the high-elevation mountains of the western Sichuan Plateau and in Chengdu city, while low volatility mainly occured in the relatively low-elevation areas of the western Sichuan Plateau, where the vegetation was more stable. (4) Future changes in vegetation cover showed a continuous decrease mainly in the new urban areas of Chengdu city, which were expanding outward. Those with persistent increases were mainly in the non-urban areas of the Sichuan basin and the river valley areas of the western Sichuan Plateau. (5) Elevation and slope were the main factors affecting vegetation change, and the correlation between slope direction and vegetation change did not show a clear pattern.
Research Reports
Analysis on spatial-temporal changes of NPP and the climate driving factors in Chengdu-Chongqing economic circle
LIANG Shuai, Xin Yu, GU Jirong
2024, 45(1): 41-49.   doi: 10.12172/202304170005
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Abstract:
In order to explore the temporal and spatial changes of NPP and the relationship with climate in Chengdu-Chongqing economic circle, based on the NPP data of MOD17A3 product, the evolution trend of vegetation NPP in 2001-2020 was simulated by one-dimensional linear regression model, and the change characteristics of vegetation NPP were analyzed. Combined with the meteorological data interpolated by ANUSPLIN, the impact of climate change on vegetation NPP changes in the study area was quantitatively analyzed by correlation analysis. The research resluts showed that: (1) The overall NPP of vegetation in the study area showed a slow growth trend, with a growth rate of 7.53 g C·m−2· a−1. Meanwhile, the mean distribution of NPP of vegetation showed a spatial pattern of high around and low in the middle. (2) There was spatial heterogeneity in the effects of climate factors on the changes of vegetation NPP in the study area. The negative correlation between air temperature and NPP was obvious in some areas of Meishan City, Leshan City, Ya’an City, Qianjiang District and Pengshui County of Chongqing City, and the positive correlation was widely distributed in the central and eastern part of Chengdu-Chongqing urban agglomeration. The positive correlation between precipitation and vegetation NPP accounted for 92.46% of the total area. (3) The study area was mainly affected by non-climate factors, accounting for 86.87% of the total area, indicating that human activities had a more and more intense impact on vegetation NPP changes, and the study of human effects should be the focus of ecological restoration in Chengdu-Chongqing urban agglomeration.
Research Reports
Changes of forest ecosystem service values in the process of primary succession in Hailuogou glacier retreat area
QIN Shihao, FU Shun, LUO ji
2024, 45(1): 50-57.   doi: 10.12172/202306260001
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Abstract:
By analyzing the changes of ecosystem service value per unit area during the primary succession of the Hailuogou glacier retreat area, it could provide some help for the policies and guidelines of positive effects of artificial ecosystem management, reconstruction and restoration. Six sample plots (12, 30, 40, 50, 70 and 120 years) were set up in Hailuogou glacier retreat site. According to the Specification for Assessment of Forest Ecosystem Service Functions (LY/T 1721-2008), the ecosystem service values of different sites were calculated in five aspects: nutrient element accumulation, carbon sequestration and oxygen release, soil conservation, water retention and species diversity per unit area. The results were as follows: (1) The ecosystem service values reached the maximum value of 23721.95 Yuan·hm−2·a−1 in sample plot 5 and the minimum value of 7326.49 Yuan·hm−2·a−1 in sample plot 1, and the growth rate of ecosystem service values per unit area showed a process of rapid increase at first and then slow decrease. (2) The maximum growth rate of ecosystem service values per unit area was +8.22% per year from plot 1 to plot 2, and the minimum growth rate was −1.64% per year from plot 2 to plot 3. (3) The ecosystem service functions in different sites were mainly carbon sequestration and oxygen release, water conservation and biodiversity. It was found that the main ecosystem service functions in the Hailuogou glacier retreat were basically the same as those in other forest ecosystems, and the ecosystem service values per unit area varies significantly among different sites during the succession process.
Research Reports
Response of different Hibiscus mutabilis L. varieties to cadmium stress
LI Xiu, CHEN Xi, LI Mengxia, ZENG Xinmei
2024, 45(1): 58-65.   doi: 10.12172/202303300001
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Abstract:
In order to understand the response of different Hibiscus mutabilis L. varieties to cadmium (Cd) stress, the hydroponic experiments were conducted to investigate the growth, tolerance, leaf pigment, Cadmium (Cd) concentration, Cd accumulation, bioconcentration factor and transfer factor of four different Hibiscus mutabilis L. varieties under different Cd concentrations (0, 2.5, 5, 10 mg·L−1). The results showed that with the increase of Cd concentration, the growth of Hibiscus mutabilis L. showed a toxic hormetic effects. Basically, compared with CK (0 mg·L−1), adding Cd (treatments) increased biomass, root length and new branch length for all Hibiscus mutabilis L. varieties under low Cd concentration, but had opposite effects under high Cd concentration. Under Cd treatment, the leaf pigment concentration of all varieties were significantly lower compared with CK, and the leaf pigment concentration of ‘Bairihuacai’ species was the highest. The Cd tolerance index of Hibiscus mutabilis L. was 0.76-1.17, and ‘Bairihuacai’ species had the highest Cd tolerance index (1.00~1.17). The Cd concentration in the root of Hibiscus mutabilis L. (205.01~1089.35 mg·kg−1) was significantly higher than that in shoot (27.70~188.92 mg·kg−1). The Cd concentration in the root of ‘Bairihuacai’ species was the highest than others, and ‘Caixia’ species had the highest Cd concentration in the aboveground part. Cd accumulation in the aboveground part of Hibiscus mutabilis L. was significantly higher than that in the root, which was 0.17~1.01 mg·plant−1 and 0.04~0.32 mg·plant−1 respectively. The enrichment coefficient of Cd in Hibiscus mutabilis L. was 56.83-115.59, and the transport coefficient was from 0.08 to 0.38. Among which ‘Bairihuacai’ species had the highest Cd enrichment ability, and ‘Caixia’ species had the highest Cd transport coefficient. In conclusion, Hibiscus mutabilis L. has strong tolerance and accumulation ability under Cd pollution condition, among which 'Bairihuacai' species had the best tolerance and the strongest Cd accumulation ability among the four species, and had the greatest potential as an ornamental emediation plants for Cd restoration.
Research Reports
Genetic variation analysis of growth characteristics in half-sib progeny of the second generation seed orchard of Chinese fir in Sichuan Province
CHEN Guoquan, ZHU Yuanwei, ZHANG Xiaoguo, LUO Hong, LI Jun, YANG Changtong, ZHU Peng
2024, 45(1): 66-74.   doi: 10.12172/202305110001
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Abstract:
The progeny testing in seed orchards is a necessary way to promote the upgrading of seed orchards. The genetic variation of the 13-year-old growth characteristics of the half-sib progeny of the second generation clonal seed orchard of Chinese fir was analyzed, which provided basic data for the construction of the third generation seed orchard of Chinese fir. The results showed that there were significant differences in the diameter at breast height (DBH), tree height (H), and volume (V) among families, blocks, and their interaction effects. The family heritabilitis of DBH and V were 0.279 and 0.250, which had the value and potential for conducting selection. The coefficient of variation (CV) of DBH showed that growth was still in the process of continuous differentiation, whether between individuals or families. The average values of DBH, height and volume of 51 families were 17.18cm, 12.61m and 0.1592m3, respectively. Comparied with the control, the real gains were 3.56%, 2.66%, and 8.00%, respectively. There were 21 families with a real gain exceeding 10% in volume, among which the family with the largest volume achieved a real gain of 31.43%, which was obvious. According to the coefficient of variation of volume and DBH, the comprehensive goodness analysis showed that 24 families, including T71, T78, T122, T152, T106, T114, and T88, had excellent comprehensive performance and could be used as the main candidates for the construction of third-generation clonal seed orchard.
Research Reports
Effects of different fertilization treatments on vegetative growth of Camellia reticulata trees
XIE Yin, CAO Yongqing, REN Huadong, YU Zuhua, YIN Biqi, DUAN Shengcai, LI Kanqing, LI Lihua, XU Zhiying
2024, 45(1): 75-83.   doi: 10.12172/202305060001
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Abstract:
Taking 5-year-old Camellia reticulata seedlings as objects, effects of different fertilization treatments on their vegetative growth were discussed. A total of 19 treatments with different mineral elements, elements ratio and fertilization amount were designed, and the vegetative indexes including the height, crown area, ground diameter, leaves size of trees, the amount, length, diameter, internode length of spring shoot, and the amount of yellow leaves, autumn shoot, diseased leaves and shoots were measured. The growth rate and disease incidence were calculated, and the effects of different treatments were comprehensively and quantitatively scored. The result showed that single application of 50 g nitrogen fertilizer per square meter crown area could promoted the tree growth effectively, while adverse effects were appeared under the treatment of 100 g and 150 g nitrogen application per square meter crown area. Under the condition of nitrogen deficiency, the application of phosphorus and potassium fertilizers could not promote tree growth. With the application of compound fertilizer containing 15% nitrogen, phosphorus and potassium respectively, Camellia reticulata grew normally in the early stage, but leaves became yellow gradually after autumn. The application of 50 g compound fertilizer with the ratio of nitrogen, phosphorus and potassium of 9∶1∶4 per square meter crown area had the best promotion effect on the growth of Camellia reticulata, and the nitrogen poisoning reaction occurs when the application amount increased to 150 g. In addition, there was no dramatically effect with magnesium application treatment. In conclusion, in March and July, 50 g·m−2 compound fertilizer with nitrogen, phosphorus and potassium ratio of 9∶1∶4 was the best, followed by the application of compound fertilizer with each 15% content of nitrogen, phosphorus and potassium respectively.
Research Reports
Research on average height and average DBH model of dominant trees in forest stands based on Mixed Effect Model
XIE Shikui
2024, 45(1): 84-90.   doi: 10.12172/202303240001
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Abstract:
The Mixed Effect Model is gradually being applied in the forestry field, which can not only describe the overall change law of data, but also reflect the changes between data, making the estimation results more accurate. Calculating tree height by diameter at breast height provides convenience for forestry investigation to a certain extent. Taking 123 sample plots in Huili City as the research object, the mixed effect model of average height and average DBH of dominant trees in forest stands was constructed, and the correlation between average height and average diameter of dominant trees in forest stands was analyzed. The research results showed that: (1) The correlation between average height and average DBH of dominant trees in forest stands was extremely significant. (2) The fitting effect of the power function model was the best both among individual trees on the whole. (3) The Mixed Effect Model could not only reflect the overall change trend of the average height of dominant trees in forest stands on the average DBH, but also reflect the impact of different tree species. The performance of AIC and BIC was better, and the model fitting effect was better.
Research Reports
Research on spatial distribution characteristics and influencing factors of tourism resources in Sichuan Province based on POI data
LIU Yeshuang, FAN Ningning, LUO Wei
2024, 45(1): 91-99.   doi: 10.12172/202304130001
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Abstract:
Based on GIS spatial analysis technology, the geographical information data such as tourism resources POI in Sichuan Province were takend as the research object, and the spatial distribution characteristics of various tourism resources were identified by spatial analysis methods such as kernel density algorithm, standard deviation ellipse, spatial autocorrelation, and the influencing factors of the formation of distribution patterns were explored from two major factors of nature and humanity. The results showed that: (1) The spatial agglomeration distribution characteristics of various tourism resources in Sichuan Province were obvious and showed a hierarchical trend of decreasing from the center to the surrounding areas, with an overall distribution pattern of more in the east and less in the west, mainly distributed in Chengdu City, Deyang City, and Ya'an City. (2) The spatial distribution direction of various types of tourism resources was consistent with the distribution characteristics of scenic spots. The directionality and centripetal orientation of modern humanistic tourism resources were not obvious, while the directionality and centripetal orientation of the other four types of tourism resources had varying degrees of agglomeration characteristics. (3) There were significant spatial differences in the distribution of cold and hot spots in various cities' tourism resources. The distribution of biological landscape tourism resources was relatively uniform, and the geographical landscape tourism resources were the most abundant in the hot spots within the city. The cold and hot spots of water scenery and modern cultural landscape tourism resources had similarities in regional distribution characteristics. (4) This paper analyzed the influencing factors from two aspects: natural conditions and socio-economic conditions. Among them, topography and hydrology were the internal decisive forces affecting the distribution of various tourist attraction in Sichuan Province, while socio-economic level, traffic conditions and population were the important external forces influencing the development and construction of tourist attractions.
Brief Reports
Investigation on bamboo plant resources in Longqishan Nature Reserve of Fujian Province
GUO Huizhu, CAI Changfu, GUO Yisong, ZHANG Yi, CAI Bangping
2024, 45(1): 100-104.   doi: 10.12172/202304170004
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Abstract:
Based on field investigation, specimen collection and literature review, the diversity and distribution of bamboo plant resources in Longqi Mountain Nature Reserve of Fujian Province were investigated and analyzed. The results showed that there were 7 genera and 20 species (including forma) of bamboo plants in the reserve, including two new distribution species. Natural distribution analysis showed that amphipodium and monopodium bamboo species were the dominant groups in natural distribution.
Brief Reports
Effects of bamboo symbiotic microorganism system on severely degraded grassland in Hongyuan County
XIAO Ximeng, YANG Zhuang, LIAO Hong, LONG Wencong, LIU Junyi, YANG Yaojun
2024, 45(1): 105-110.   doi: 10.12172/202304060002
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Abstract:
Grassland degradation had a serious impact on local ecological and economic development. In order to alleviate the influence of degraded grassland on vegetation growth and improve the soil environment of degraded grassland, a bamboo fungus symbiotic system composed of high water absorbing bamboo fibers and bamboo fiber symbiotic bacteria was used to treat severely degraded grassland (the total coverage decreased by more than 30% and the total grass yield decreased by more than 50%). The effects of the system were as follows: (1) Compared with the control group, the monthly average soil moisture in the test group was 24.74% higher, and the monthly average temperature was 3.4% lower. The soil moisture from July to November was significantly higher than that in the control group. (2) The number of bacteria, fungi and actinomycetes in the test group was higher than that in the control group, which were 27.48%, 107.76% and 187.76% respectively. (3) The contents of ammonium nitrogen, available phosphorus and organic matter in soil were higher than those in control group, which were 60.06%, 41.05% and 10.47% respectively. (4) The number of soil microorganisms was positively correlated with soil nutrient content, fungi was significantly positively correlated with available phosphorus, and actinomycetes was extremely significantly positively correlated with available phosphorus. (5) The leaf length, width, total phosphorus and total potassium contents of chicory general leaves in the test group were significantly higher than those in the control group.
Brief Reports
Comparison of water body extraction methods based on Sentinel-1 data, combined with Sentinel-2 data and Landsat8 images: taking Luban reservoir as an example
SU Zixin, QING Lingxuan, WANG Xin, XUE Feiyang, WANG Xu, QIN Xiangyu, YANG Cunjian
2024, 45(1): 111-114.   doi: 10.12172/202306070001
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Abstract:
Base on sentinel-1 data, combined with sentinel-2 data and Landsat8 data, the annual changes of water bodies in Luban reservoir from 2017 to 2021 were extracted, the extracted water body area analysis was analyzed, and the difference of water bodies extracted by the two images of Luban reservoir were compared. The water body area of Luban reservoir in this study area was obtained through the calculation and analysis of the water body index. It was better to extract water from sentinel-2 image data than Landsat8 data. The overall classification accuracy of sentinel-2 image was 0.993 and the kappa coefficient was 0.991, while the overall accuracy of Landsat8 was 0.989 and the kappa coefficient was 0.986. Sentinel-2 data is more suitable for water body extraction in Luban reservoir, a large and medium-sized water body.
Brief Reports
Physical and mechanical properties of Dalbergia fusca wood
TIAN Mi, DONG Xiaona, ZENG Xiangquan, CHEN Feifei
2024, 45(1): 115-119.   doi: 10.12172/202304170003
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Abstract:
In order to develop and utilize Dalbergia fusca wood reasonably, the main physical and mechanical properties of the wood were measured and analyzed. The results showed that Dalbergia fusca wood was a high-density wood with small shrinkage coefficient of the total dry volume. The compressive strength, bending strength and impact toughness were 60.13 Mpa, 126.4 Mpa and 80.8 2 kJ·m−2 respectively, and the corresponding strength grade were grade four, four and second, respectively. The hardness values of end face, chord face and radial face were 105.38 Mpa, 85.12 Mpa, and 87.15 Mpa, respectively, and the hardness of end face and chord face belong to very hard level, and was high-density wood. The comprehensive strength of wood was 186.53 Mpa, belonging to high-strength species. The comprehensive quality coefficient of wood was 277.83 MPa, belonging to high-quality wood.
Brief Reports
Measurement and analysis of color difference of excellent ornamental Bletilla flowers in Southwest China
LI Wenjun, JIANG Liqiong, HUAN Jie, GAO Suping, LEI Ting, XIAO Qiangang, SHEN Ping, YANG Hongyan, HE Zhoujian
2024, 45(1): 120-125.   doi: 10.12172/202305300002
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Abstract:
The color difference of excellent ornamental Bletilla flowers in southwest region was measured and analyzed, and its correlation with growth characteristics was explored. The germplasm resources of Bletilla striata, Bletilla ochracea, Bletilla formosana in southwest region were collected, and their apparent traits were measured. The petal color was measured under standard light source D65, and classified by CIELab color system. The results showed that the flower colors were divided into 8 color systems: purple, deep purple, pink purple, light purple, pink, light orange, light yellow, and yellow. There was a significant correlation between the color difference of flower color and flowering period, plant height, and flower stem height. The establishment of a color difference evaluation model could provide a reference basis for the breeding of improved varieties and parent selection of the ornamental Bletilla.
Brief Reports
Function identification and analysis of “production, living and ecological spaces” in hilly areas: a case study of Renshou County
ZHONG Shiyi, YANG Qingjuan
2024, 45(1): 126-132.   doi: 10.12172/202310140001
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Abstract:
The identification and analysis of “production, living and ecological spaces” is an important part of the improvement of human environment and optimization of land space development nowadays. Due to the limitation of physical and geographical conditions, the incremental space for construction and development in hilly areas was limited, so the efficient use of land resources and the coordination and integration of “production, living and ecological spaces” need urgent attention. Based on the spatial identification and analysis of “production, living and ecological spaces”, this paper aimed to reflect the remaining problems of regional spatial layout in hilly areas under the national development policy and enhanced land use efficiency. Taking Renshou County as an example, the spatial functional classification system of “production, living and ecological spaces” was constructed, and then the distribution of land for “production, living and ecological spaces” in the county in 2020 was analyzed by adopting the methods of spatial Lorenz curve, Gini coefficient, degree of equilibrium, and degree of dominance. The conclusion of the study showed that the spatial distribution of main production space in Renshou County was absolutely average, and the distribution of main ecological space was relatively average. The distribution of balanced space was relatively reasonable, while the distribution of main living space in various townships of the county was disparate. There was a certain correlation between “production, living and ecological spaces” land use pattern and topographic factors. Finally, corresponding countermeasures and suggestions were put forward from the perspective of layout optimization of various types of “production, living and ecological spaces”.
Brief Reports
Machilus thunbergii, a new record species of Lauraceae in Sichuan Province
GAO Gang, CAI Yiping, XIE Chunyang, SHOU MUxiaoying, CHEN Xuyan
2024, 45(1): 133-134.   doi: 10.12172/202305050001
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Abstract:
Machilus thunbergii Sieb. et Zucc., a new record of Lauraceae was reported as Sichuan Province. The voucher specimens were deposited in the Herbarium of Yibin University (KQ-1-012). This discovery broadenedthe the distribution area of the species and further enriched the species diversity of Lauraceae in Sichuan Province.
Brief Reports
Four new records of Lysimachia in Primulaceae from Sichuan Province
HUANG Qin, ZHU Zhaoxu, MAO Yingjuan, HE Song, HE Jianglin, WANG Xin
2024, 45(1): 135-138.   doi: 10.12172/202308280002
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Abstract:
Based on field investigation, specimen identification and literature review, four new record groups of the genus Lysimachia (Primulaceae) in Sichuan Province were found, including Lysimachia chapaensis Merrill, L. fordiana Oliver, L. glaucina Franchet and L. lichiangensis Forrest. The collection information of the type specimens, main identification characteristics, and the specific distribution locations of the four records species were briefly introduced. The voucher specimens were deposited in the Herbarium of Chengdu Institute of Biology (CDBI).

Journal Title: Journal of Sichuan Forestry Science and Technology

Editor-in-Chief: Mu Changlong

Date Of Publication: May 1979

Administered By: Forestry and Grassland Administration of Sichuan Province

Sponsored By: Sichuan Society of Forestry
Sichuan Academy of Forestry

Frequency: Bimonthly

Tel: 028-83220733

E - mail: scslxh2004@163.com

CN 51-1217/S

ISSN 1003-5508

Journal of Sichuan Forestry Science and Technology Flash