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2018 Vol. 39 Issue 4

2018 Vol. 39, No. 4

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The Resere of Carbon,Nitrogen,Phosphorus and Potassium and Their Distribution Features in Young and Middle-aged Cupressus funebris Forests in the Wuling Mountain Area of Chongqing
WANG Yi-hao, CUI Yun-feng, XUE Lan-lan
2018, 39(4): 1-7,30. doi: 10.16779/j.cnki.1003-5508.2018.04.001
Abstract:
The reserve of carbon(C),nitrogen(N),phosphorus(P)and potassium(K)and their distribution features were studied in young and middle-aged Cupressus funebris forests in the Wuling Mountain Area of Chongqing.The results showed that the contents of C,N,P and K in organs were not significantly different between young and middle-aged C.funebris forests.The contents of C,N and P were the highest in leaves for both forests,C and N content was the smallest in trunks.The trunk was the main organ for the material storage of tree layer in C.funebris forests.Compared with young forests,P and K storages in middle-aged C.funebris forest were significantly higher,but the difference of material storage in other organs between them was not significant.Similarly,the difference of material storages in litter layer and soil layer between young forosts were not significant generally,but material storage in each soil layer of middle-aged C.funebris forests was higher than that of young forests.C,N,P and K storage in young forests were 144.5997 t·hm-2,7.0839 t·hm-2,1.2261 t·hm-2 and 46.5130 t·hm-2,and those in middle-aged forests were 160.5415 t·hm-2,10.0162 t·hm-2,3.0957 t·hm-2 and 49.0526 t·hm-2 respectively.The storage distribution paltern was as follows soil layer>tree layer>and litter layer in descending order.Soil layer was still the main reservoir for material storage in young and middle-aged C.funebris forests (the average proportion was 87.23% and 91.92% respectively).In general,the material storage function of middle-aged C.funebris forests was stronger than that of young forests in the Wuling Mountain Area.
A Study of Individual-tree Growth Models in Natural and Artificial Forests of Alnus cremastogyne
WU Xiao-min, XU Chun, YANG Han-bo, CHEN Zhi, GUO Hong-ying, HUANG Zhen, WANG Ze-liang
2018, 39(4): 8-11,44. doi: 10.16779/j.cnki.1003-5508.2018.04.002
Abstract:
The rules of growth and development was calculated for natural and artificial forests of Alnus cremastogyne,which would lead to better management of forests.Based on the measured data of height and DBH,individual tree height-diameter models were developed for A.cremastogyne by analyzing the existing nine height-diameter models.The results showed that the values of R2,Radj2,RMSE,ERMSE,ME,and MAE of the optimal height-diameter model were 0.79403,0.79217,0.886,0.045,0.00021,and 2.64125,respectively.The optimal growth model argument for individual trees of A.cremastogyne was DBH,the growth model was H=1.3+27.176×(D/(1+D))11.856.The height-diameter model was biologically reliable for predicting the growth of A.cremastogyne in Sichuan province.
Advances in Researches on the Drought Resistance of Walnuts
WANG Han-ru, LI Pi-jun, LIU Hua, XING Wen-xi, ZHENG Chong-wen
2018, 39(4): 12-16. doi: 10.16779/j.cnki.1003-5508.2018.04.003
Abstract:
The walnut was one of the world's famous dried fruits.also a hardwood species with high quality.It was mainly distributed in arid,semi-arid,humid and semi-humid areas,and affected by different degrees of drought.Drought,as a water stress,impacted on plants mainly in the growth,development and physiological metabolic process.Native and foreign researches were systematically reviewed in the changes of walnut morphology,tissue water status,plasma membrane system,osmotic adjustment substances and protective enzyme system under drought conditions.In order to provide a theoretical basis for screening and breeding of drought-resistant and high-yield varieties of walnuts,and the sustainable development of walnut industry.Drought was an adversity that plants often suffered,the world's arid and semi-arid regions accounted for 43% of the world's total area,and sometimes there would be a certain degree of summer drought in the humid and semi humid areas.The impact of drought on economic forests was very large,especially on the growth,yield and quality of nuts.In order to acquaint the different varieties of walnut drought resistance,it was necessary to understand the physiological and biochemical response of the walnuts in drought conditions,and to explore the mechanism.It could provide a theoretical basis for sustainable development of walnut industry to screen and breed drought-resistant high-yield varieties of the walnut.
Research Status and Prospect of Post-earthquake Ecological Restoration in China
GAN Long-mei, LIU Yi, QIN Zhi-gang, PENG Jian, XIONG Ding-wei, GUO Cong, SHI Liang
2018, 39(4): 17-21. doi: 10.16779/j.cnki.1003-5508.2018.04.004
Abstract:
In recent years,frequent occurrences of strong earthquakes have greatly disturbed the ecosystem in our country.In this paper,a description was given of the research status in four aspects for post-earthquake ecological restoration in China,including ecological restoration methods and technologies,plant selection and allocation,ecological restoration modes,and ecological restoration effects.The main problems were pointed out.For the future research on post-earthquake ecological restoration,five key points were put forward,namely,(1) Deepening the research of basic theory; (2) Establishing a system of ecological restoration model; (3) Attaching importance to the study of approx-natural recovery; (4) Identifying long-term restoration targets and establishing long-term repair mechanism; (5) Perfecting ecological restoration evaluation system.
Selection of Rhizosphere Phosphate-solubilizing Bacteria for Juglans regia
LI Shi-juan, SONG Zu-wen, WANG Li, HUANG Zhong-hua, SHENG Yu-zhen, JIN Kai-ming, ZHANG Ling, XU Lei
2018, 39(4): 22-25,53. doi: 10.16779/j.cnki.1003-5508.2018.04.005
Abstract:
It aimed to gain highly efficient phosphate-solubilizing microorganisms.Phosphate-solubilizing bacteria were isolated in advantage of Pikovskava phosphate dissolving medium.Liquid fermentation experiments showed the phosphate-solubilizing activity,molecular biological methods identified the microbial functional community with higher activity.By single factor test,the vitality of different strains were compared under different formulas and the fermentation conditions of culture medium.Bacillus sp.was the phosphate-solubilizing bacterium with higher efficiency.The optimum medium was as follows:suitable initial pH of 5~9,optimum temperature range of 16℃~40℃,ammonium sulphate,ammonium chloride and ammonium oxalate,peptone for suitable nitrogen source,ammonium oxalate,sucrose,glycerol for suitable carbon source.High concentration of Fe3+ and Mn2+ had a certain role in promoting its vitality,but Cu2+,Ni2+ and Zn2+ would hold the phosphate solubilizing.In different formulations and fermentation conditions,Its phosphate solubilizing ability was better than that of microbial fertilizer 2.In different fermentation conditions,the stability of phosphate solubilizing ability was better than that of microbial fertilizer 1.It would give a certain market potential for the phosphate-solubilizing bacteria added to the fertilizer.
Effects of Seed Priming on Lycium barbarum Seed Germination Under Salt Stress
ZHAN Zhen-nan, WANG Wen-juan
2018, 39(4): 26-30. doi: 10.16779/j.cnki.1003-5508.2018.04.006
Abstract:
Lycium barbarum was a kind of representative perennial shrub with drought and salinity tolerance,and it often grew in deserts of China's northwest.Seeds of NingQi No.1 were primed with 100 mmol·L-1 NaCl.By petri dish techniques,the primed seeds under H2O(control) were subjected to salt stressed of 6 NaCl concentrations (20 mmol·L-1、40 mmol·L-1、60 mmol·L-1、80 mmol·L-1、100 mmol·L-1、120 mmol·L-1).The effects of the seed priming and salt stress on seed germination were then investigated.The results showed that with or without priming,germination speed of NingQi No.1 seeds slowed down significantly.The germination percentage,germination energy and germination index all declined obviously with increased NaCl concentration,and the germination process showed a significant delay.As compared with unprimed seeds under the same NaCl concentration,primed seeds increased germination speed and shortened the germination process in different extent.The germination energy and germination index of the primed seed were significantly higher than those of unprimed seeds.The results suggested that L.barbarum seed priming shortened the germination process under salt stress,improved the uniformity of seed germination,but the impact on the final germination rate was not significant.
Effects of Different Matrix Formulations on the Seedling Growth of Horsfieldia tetratepala
ZHONG Ping, XU Yu-mei, YANG De-jun, CHEN Yong, LIU Ji-mei
2018, 39(4): 31-33. doi: 10.16779/j.cnki.1003-5508.2018.04.007
Abstract:
Effects of 6 kinds of different substrates were studied on Horsfieldia tetratepala seedling growth (height and diameter) by variance analysis and LSD multiple comparison analysis method.Results showed that there were extremely significant differences in height and diameter of container seedlings culvated in 6 kinds of substrates.The best Matrix formulation was composed of bagasse,sheep manure and forest soil by a ratio of 1:1:1,which could promote seedling height and diameter growth.
A Study of the Relationship Between the Crown Width and Diameter Growth of Betula alnoides
XU Lin-hong, LIU Ji-mei, YANG De-jun
2018, 39(4): 34-36. doi: 10.16779/j.cnki.1003-5508.2018.04.008
Abstract:
The relationship between DBH and crown width were investigated for independent and well-growing trees without disturbance in the natural stand of Betula alnoides in Xishuangbanna.It was found that the crown diameter ratio was about 22.4~71.3 times (the ratio of crown diameter to DBH) before DBH reached about 45 cm~50 cm.With the increase of DBH,the number of stands should be reduced accordingly.When the DBH reached above 45~50cm,the crown diameter ratio was basically stable,and the crown diameter ratio was about 19.1~22.6 times.
A Study of Inducing 2n Pollen of Populus deltoid by Colchicines
ZHAO Xin-wen
2018, 39(4): 37-40. doi: 10.16779/j.cnki.1003-5508.2018.04.009
Abstract:
In order to get the triploids of P.deltoid,the technique was researched to induce 2n pollen of P.deltoid by colchicines by two-factor randomized block design.The results indicated that(1)a certain proportion of 2n pollen grains could be gotten from the male buds induced by cochicine solution with the concentration of 0.3%,0.5% and 0.8%,under the condition of water culture for 3,4 and 5 days.(2)the proportion of 2n pollen grains could be the highest when the male buds were treated by the cochicine solution of 0.5% under the condition of water culture for 3 days,the percentage of A4(d≧50) could be up to 1.4%,the percentage of 2n pollen (d≧37.5) could be up to 23.4%.
Effects of Different Cultural Environment on the Growth and Chemical Compositions of Dendrobium nobile
LI Zai-jun, GONG Yi-gang, LI Yue-wen, DU Hong, ZENG Xiao-ying
2018, 39(4): 41-44. doi: 10.16779/j.cnki.1003-5508.2018.04.010
Abstract:
The effects of different cultural environment were studied on the growth and chemical compositions of Dendrobium nobile on the basis of specific Climatic conditions of Chongqing.The results showed that D.nobile cultured in natural forest were better,which was nestled up to trunk by the rope of rice straw and nylon cable ties.There were significant differences in active component and water content under different culturing conditions of greenhouse,natural forests and plantation.The active component content of D.nobile cultured in forests was more than that in green house.Especially the content of total polysaccharides was higher than that in D.nobile cultured in Chishui of Guizhou Province.
Growth Analysis of Half Sib Progenies in Clonal Seed Orchard of Second Generation for Cunninghamia lanceolata in Hongya,Sichuan
XIAN Wei, WU Kai-zhi, CHEN Bao-jun, CHEN Guo-quan
2018, 39(4): 45-48. doi: 10.16779/j.cnki.1003-5508.2018.04.011
Abstract:
Investigation and analysis were made of semi-sib progenies for forests of ten-year-old Chinese fir in the seed orchard of Bamianshan State-owned Forest Farm in Hongya County.Results showed that there were significant differences in breast diameter,tree height and volume between 51 families.The real gain was significant,with a DBH gain of 6.3%,a tree height gain of 3.6%,and a volume gain of 16.7%.The maximum of DBH reached 23.7 cm in No.42 family.The highest value of tree height appeared in No.31 family,reaching 14.8 m.A comprehensive analysis showed that there were good volume gain and genetic stability in No.4,No.44,No.10,No.34,No.21,No.8,No.11,No.43,No.22,No.42,No.28,No.19,No.7 and No.47.
A Study of the Cutting Rooting of Dalbergia sissoo in Dry-hot Valleys
XIE Da-jun, FENG Zhong-wu, YANG Gang, WEN Yi, HUO Zhi-long, LI Tao, LUO Ya, YUAN Xiao-ping
2018, 39(4): 49-53. doi: 10.16779/j.cnki.1003-5508.2018.04.012
Abstract:
Comparative studies were made of cutting experiments of Dalbergia sissoo treated by different plant-growth regulations including IBA,NAA,IAA,6-BA in dry-hot valleys of Panzhihua.The results showed that visible callus occurred under all the above treatments.IBA could significantly improve the rooting rate of D.sissoo.The rooting ratios of cuttings were up to 56% and 66% respectively by treatment of IBA 100 mg·L-2 and IBA 200 mg·L-2,better than other IBA treatments,the rooting ratios of cuttings were 30% and 18% with IBA 400 mg·L-2 and IBA 800 mg·L-2 treatments.Obviously,the high concentration of IBA could inhibit the growth of root tissue cultures.The highest rooting ratio reached 44% by NAA 100 mg·L-2 treatment,but rooting ratios were 20% to 34% by all the treatments of IAA.There was no rooting occurred under all the 6BA treatments and 25 mg·L-2 NAA,even lower than that of control group,which could be influenced by other uncontrollable factors for further research.
Comparison of Different Grafting Methods for Walnuts in the Mountain Area of Northern Sichuan
PU Yuan-zhong, XU Jia
2018, 39(4): 54-56,63. doi: 10.16779/j.cnki.1003-5508.2018.04.013
Abstract:
The grafting survival rate of the walnut can directly influence the success or failure of its species improvement.This paper has done an investigating and analysis work on the results of four grafting methods of walnuts in Jiange county.And conclusions have been drawn on how to make rational use of different walnut grafting methods,in order to better guide the Sichuan walnut species improvement work.
Parnassia gansuensis Ku,A Newly Recorded Species of Parnassia (Saxifragaceae) in Sichuan Province
WANG Jia-cai, YU Qian-nan, HU JUN
2018, 39(4): 57-58,68. doi: 10.16779/j.cnki.1003-5508.2018.04.014
Abstract:
In this study,Parnassia gansuensis Ku(Saxifragaceae) was reported as a new record species in Sichuan,which was distributed in Hongya County,the southern end of Qionglai mountains.This finding enriched the biodiversity data of Sichuan,and provided new data for the connection between the rainy zone of west China and the Qin-Ba Mountain flora.
Effects of Human Disturbance on Community Structure and Species Diversity of Pinus massoniana Planatation Forest in the Lotus Mountain
HE Hai-yang, LONG Kai-xuan, TANG Yong-bin
2018, 39(4): 59-63. doi: 10.16779/j.cnki.1003-5508.2018.04.015
Abstract:
Taking the Lianhua Mountain in Ya'an as an area,the effect of human disturbance was investigated on community structure and species diversity of Pinus massoniana planatation forest by typical plots methods.The results showed that a total of 127 vascular plant species were recorded,belonging to 76 families and 94 genera.The sum was the lowest in diameter class and height class of tree layer under slight human disturbance.With intensifying disturbance,the diversity indices were on the decrease in tree,shrub and herb layers.And the species diversity was the highest in shrub layer.Therefore,it was suggested that the intense human disturbance would lower the level of the community structure and species diversity of P.massoniana planatation forest.Measures should be taken to protect the forest.
Winter Habitat Selection by Musk Deers in Jiulong Mountain Nature Reserve
ZHANG Dong-dong, ZHANG Qiu-xia
2018, 39(4): 64-68. doi: 10.16779/j.cnki.1003-5508.2018.04.016
Abstract:
The research was conducted on winter habitat selection of musk deers in Jiulong Mountain Natuer Reserve,aiming to provide basis data for the recovery of populations.From November 2016 to January 2017,The method was used by setting the line randomly and putting on the points mechanically in Jiulong Mountain Nature Reserve.There were 52 quadrats used by musk deers and 78 control quadrats for the investigation.Firstly,there were four nominal variables of forest typs,slope direction,slope position,steep rocky slopes by using the method of Baileys confidence interval analysis.Then there were nine quantitative variables by using single sample Kolmogorov-Smimov tests analysis,including altitude,sheltering class,canopy,food abundance,thickets coverage,slope gradient,human disturbance,snow depth,fallen trees.Through the principal component analysis,13 factors were analyzed comprehensively by musk deer winter habitat selection.Baileys confidence interval analysis indicated that steep rocky slopes,sunny slope,middle slope and mixed forest were suitable habitats for musk deers in winter.
A Study of the Fragility of Cultivated Land in Deyang Based on Ecological Footprint
CAO Wen-ya
2018, 39(4): 69-72. doi: 10.16779/j.cnki.1003-5508.2018.04.017
Abstract:
The arable land was the basic condition and material foundation of the development of human society,and the study of the fragility of arable land could be an important means to keep the cultivated land sustainable.By introducing the ecological footprint model,an analysis was made of the changes of ecological footprints and frangibility indexes of the cultivated land in recent ten years,and the ecological situation of the arable land was obtained in recent ten years.The results showed that ① ecological footprints showed a slow downward trend.②The ecological carrying capacity was decreasing,and the descending amplitude was large.③ The ecological deficit was getting serious,which had a great correlation with the decline of ecological carrying capacity.④ The possibility of ecological crisis was increasing,the arable land presented a fragile state.A reference could be provided for the sustainable development of local arable land.
Automatic Extraction of Burned Area Based on QUEST Decision Tree
HUO Peng, YUE Cai-rong
2018, 39(4): 73-78. doi: 10.16779/j.cnki.1003-5508.2018.04.018
Abstract:
Kunming was taken as the study area to study the feasibility of forest burned area extraction in large-scale range.The vegetation,water,burned site index and texture features were extracted from Landsat TM images in 2005 and 2006,then the best characteristics bands were chosen,which adapted for the large-scale range;Decision trees were determined using the feature-fused image,and fire burned information were automatically extracted in large-scale range.The research showed that the classification accuracy of the QUEST decision tree reached 84.5%,which was better than CRUISE 2D algorithm and maximum likelihood classification;The decision tree classification based on the QUEST algorithm was used to extract 97% of 3·29" burned area,but it was not ideal on large-scale.The smaller patches need to be manually removed;Finally,the "3·02" burned area in 2015 verified that the QUEST decision tree method had certain universality.This model had important application value for the statistics of forest burned areas in large scale.
Analysis of the Forest Pest Investigation in Emeishan City
KONG Jian, RAN Xiao-xiao
2018, 39(4): 79-82. doi: 10.16779/j.cnki.1003-5508.2018.04.019
Abstract:
An investigation of forest pests were conducted in Emeishan City from April 2016 to May 2017. The result showed that there are 202 species of pest, including 117 insects, 79 diseases, 4 pest plants,1 species of mouse and 1 species of other forest pest. The species, hosts and distribution of forest pests in were basically identified in Emeishan City, which could provide comprehensive, accurate and objective basic information for forestry pest monitoring, early warning, quarantine, disaster prevention and mitigation and emergency relief work.
Investigation on Harmful Organisms and preventive Suggestions for Walnuts in Yanting County
PAN Yong
2018, 39(4): 83-86. doi: 10.16779/j.cnki.1003-5508.2018.04.020
Abstract:
Systematic investigations were made on the distribution range and damage degree of harmful species for walnuts by sampling survey method and fixed-point investigation in Yangting county,during 2017.The results showed that 5 species of diseases,13 species of pest,2 species of weeds were harmful to walnuts,and the main harmful species were Trijuglans hetaohei Yang,Alcidodes juglans Chao,Batocera lineolata,Xanthomonas jualandis and Marssonina juglandis.In this paper,an analysis was made of damage characteristics of harmful species,and the integrated control measures were put forward by strengthened investigation and forecast.
The Application of Multimedia Expert System against Landscape Plant Diseases and Pests in New-media Platform——A Case Study of Wechat Media Platform
QIAO Lin, LIANG Jia, XU Jian-rong, PAN Xin
2018, 39(4): 87-91. doi: 10.16779/j.cnki.1003-5508.2018.04.021
Abstract:
With the development of economic society,the diagnosis and control of landscape plant diseases and pests had become more and more diversified.However,the ways that people could gain information turned out to be extremely few in the marketplace,and it proved to be a very tedious process.Based on ‘My sql’ server database,the system collected not only plentiful expert knowledge in the field of landscape plant diseases and pests,but also abundant mature scientific achievements specially aiming to biological diseases and pests.On the basis of WeChat usage and the openness of WeChat media platform,database technology was used to establish the knowledgeable,scientific,authoritative and interactive platform with main function of diagnosing landscape plant diseases and pests.It would be the efficient practice related to the expert system in new-media platform.And this program had laid a solid foundation for the research of plant diseases and pests and sustainable development of an ecological system.The system combined a layer of user operation(Mini-program on WeChat)and a logical server,with a database of plant diseases and pests,which included hundreds of typical infectious landscape plant diseases and pests.And this system could provide the service for diagnosis,recognition,remedy about landscape plant diseases and pests as well as suggestions concerning controlling them through auxiliary function.It would have considerable economic benefits and a promising future.
Effects of Different Land Types on the Quality of Plum Fruits in Wenchuan County
WU Shi-lei, YANG Zhi-wu, CHEN De-chao, JIN Guo-ming, LI Wenjun
2018, 39(4): 92-94. doi: 10.16779/j.cnki.1003-5508.2018.04.022
Abstract:
In this experiment,the effects of different site types were analyzed on the quality of plum fruits which were from Wolong town of Wenchuan County,aiming to provide some theoretical basis for plum cultivation in different site types in Tibetan Plateau.
A Survey of Small Non-flying Mammals in Shenguozhuang Nature Reserve,Sichuan Province
ZHAO Wen-de, LIU Yang, LUO Jian
2018, 39(4): 95-97. doi: 10.16779/j.cnki.1003-5508.2018.04.023
Abstract:
In order to investigate biodiversity and distribution of small Non-flying mammals in Sichuan Shenguozhang Provincial Nature Reserve,a survey was conducted by snap traps and pitfall traps in July,2008 and April in 2018.The results indicated that there were 40 species of small mammals,representing 28 genera,11 families and 3 orders.The abundance of insectivore showed favorable ecological environment in this area.
GIS-based Analysis on Giant Panda Habitat Characteristics in National Giant Panda Park of Sichuan Province
LIANG Yu-xi, WANG Ge, WANG Hong-rong
2018, 39(4): 98-101,114. doi: 10.16779/j.cnki.1003-5508.2018.04.024
Abstract:
Based on GIS,Giant Panda Habitat Characteristics were analyzed with the terrain factors (altitude,slope),biological factors (vegetation type,vegetation cover,bamboo),water distribution and human disturbance (road,mining,farmland),in the national park of Sichuan Province.The results showed that the main habitats of giant pandas in the national park were concentrated in the mixed forest of broadleaf-conifer and Evergreen deciduous trees,with an altitude of 1 800 m~3 400 m and crown density of 0.2~0.7,where edible bamboos grew within 1 000 m from the water,and within a range of 1 000 m~5 000 m from residential areas.The impact of mining and road density on panda traces was obvious.Based on the analysis of habitat characteristics for giant pandas,basic reference could be provided to the habitat restoration and corridor building.
Bionomics of Leptocybe invasa Fisher & La Salle
XIAO Yin-bo, SONG Zu-wen, ZENG Quan, GU Jian-tao, ZHOU Jian-hua, JIA Yu-zhen, YANG Yuan-liang, YANG Shuang-yu
2018, 39(4): 102-105. doi: 10.16779/j.cnki.1003-5508.2018.04.025
Abstract:
According to the observations both outside and in lab,Leptocybe invasa had 2 or 3 generations a year in Chengdu area and the generations were overlapped.The larvas overwintered in the galls.The adults of the overwintering generation began to emerge in last ten days of May.And the adults would be seen until the first ten days of October.About 83.58% of the adults flew out of the eclosion holes between 08:00 and 14:00.The adults preferred to move than fly,with phototaxis and upward-taxis.
A Study of Natural Cupressus chengiana Forest Growth Distribution in the Upper Reaches of the Dadu River
WANG Bo, LIU Kai, ZHU Zi-zheng, LIN Yong, WANG Shou-qiang
2018, 39(4): 106-111. doi: 10.16779/j.cnki.1003-5508.2018.04.026
Abstract:
In order to understand the growth and distribution of the natural Cupressus chengiana forest in the upper reaches of Dadu River,the cypress forest were chosen as the object in Maerkang and Jinchuan counties.Taking high definition remote sensing image as the bottom map,the ground survey and ARCGIS vectorization technology were used to investigate the habitat factors of agrotype,slope,slope direction,elevation accessibility and DBH,tree height in different habitats.The results showed that 1) 85.64% of the agrotype was bare rock and highly gravel stone.Small,medium and large diameter groups were mainly distributed on gravel stone,bare rock and soil.2) The trees could grow on different slopes,and the area of north,northwest and west occupied 68.04% of the total area.These three slope directions were the concentrated distribution areas of cypress,with large area,high height and small diameter tree species.3) The trees mostly grew on steep slopes,60.33% of which were above 36°.Different diameter groups and tree height were concentrated on steep slopes,and dangerous slopes.4) The trees mainly grew at the altitude of 2 301 m~2 500 m,and the distribution area accounted for 81.01% of the total area.Along with the growth of trees,the altitude distribution of cypress was decreasing.5) Due to the influence of river partition and steep slope,the accessibility of trees was pretty low,and 83.27% of the area was unreachable.
Primary Report on Selection of Prunnus mume ‘Damei 1’
WANG Si-lu, LUO Jian-xun, GAO Jie
2018, 39(4): 112-114. doi: 10.16779/j.cnki.1003-5508.2018.04.027
Abstract:
Superior trees of Prunnus mume were selected in the distribution areas since 2001.On the basis of selection standard of superior P.mume trees,205 superior trees were selected primarily,and the one tree was selected finally and recognized as fine variety termed as ‘Damei 1’ by Sichuan Forest Variety Approval Committee certification in march 2017.The pulp rate of ‘Damei 1’ was 85.5% and the content of citric acid was 23.2%,which was one of best P.mume variety in Sichuan.
Strategies of Ecological Poverty Alleviation in Dafengding National Nature Reserve Community of Mabian,Sichuan
FU Li-qiang, LIYAN Wuye, CHENG Kun
2018, 39(4): 115-120. doi: 10.16779/j.cnki.1003-5508.2018.04.028
Abstract:
Ecological poverty alleviation could be an effective way to achieve the win-win situation of ecological protection and poverty alleviation in poverty areas,and it played an important role in the community poverty alleviation work of nature reserves.Dafengding National Nature Reserve was located in impoverished mountainous area of Yi minority,and some people were still in poverty because of slow economic development,and the poverty problem was intractable in surrounding communities.In this paper,an analysis were made of many types of ecological poverty alleviation models and project cases from China and abroad in recent years,then ecological projects were discussed for poverty alleviation of each mode suitable to be carried out in surrounding communities of nature reserves.
Current Status and Countermeasures of Forest Insurance Development in Sichuan
SHEN Dan-zhou
2018, 39(4): 121-125. doi: 10.16779/j.cnki.1003-5508.2018.04.029
Abstract:
Forest insurance hads been an important part of agriculture insurance system.It can help to resist risks and offer an insurance cover for the sustainable development of forestry.Based on the status of forestry insurance in Sichuan,in this paper,the major problems were analyzed,and some suggestions were put forward on how to develop forest insurance.