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华山松人工林林下植物多样性和土壤养分对间伐的短期响应

Short-term Responses of Understory Plant Diversity and Soil nutrients to Thinning in Huashan Pine Plantation

  • 摘要: 以川西南10a华山松人工林为研究对象,探究不同间伐——间伐保留量1800株/hm2(轻度间伐,M1)、1350株/hm2(中度间伐,M2)、900株/hm2(重度间伐,M3)三种间伐强度技术措施下,3年后对林下植物多样性和土壤养分的影响,为本区人工林森林质量精准提升提供理论依据。结果表明:(1)间伐强度越大,林下植物种类及数量越多,喜光植物是间伐后进入样地的先锋植物;(2)林下植物多样性指数随着间伐强度的增加而增大,所有间伐强度的Pielou指数、Margalef指数、Shannon-Wiener指数和Simpson指数与对照均存在显著差异(P<0.05);不同处理之间,间伐强度M1和M3的Margalef指数和Shannon-Wiener,均存在显著差异(P<0.05);(3)所有间伐处理的林下植被盖度与对照均存在显著差异(P<0.05),不同处理之间,间伐强度M1和M3的林下植物盖度存在显著差异 (P<0.05);(4)土壤有机质含量在所有间伐与对照之间存在显著差异(P<0.05),且间伐强度M3与M1、M2之间差异显著(P<0.05),土壤有机质含量与植物的多样性指数呈显著正相关(P<0.05)。研究表明,从短期影响效果看,间伐强度选取保留量900—1350株/hm2 有利于林下植物多样性和土壤养分的提高。

     

    Abstract: In order to providing a theoretical basis for precision improvement of artificial forest quality, a 10-year-old Pinus armandii plantation in western Sichuan was chosen as the research object, to explore the effects of different thinning intensities (thinning retention of 1800, 1350, and 900 trees per hectare) on the species composition, bio-diversity, and vegetation structure of understory plants, and soil nutrients three years after thinning in this area. The results showed that: (1) The thinning technique was useful for understory plant diversity There are more types and quantities of understory plants with the greater the intensity of thinning.Pioneer plants are light loving plants; (2) The diversity index of understory plants increased with the increase of thinning intensity. Pielou index, Margalef index, Shannon-Wiener index, and Simpson index all showed significant differences between thinning intensities and CK (P<0.05). Margalef index and Shannon Wiener index are significant differences in M1, M3 (P<0.05); (3) The cover of understory plants showed significant differences between the thinning treatments and CK (P<0.05), and there was also significant difference between M1 and M3. (4) There was significant difference in soil organic matter content between thinnings and control (P<0.05), and showing a significant difference in M3 thinning intensity and M1& M2 (P<0.05). Soil organic matter content was also significantly positively correlated with plant diversity indexs (P<0.05). The results of short term study indicates that a reserve intensity of 900-1350 trees per hectare is favorable from the enhancing the understory plants diversity and soil nutrient of Huashan pine plantation.

     

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