Liu Si-Ze, Yin Hai-Feng, Shen Yi, Kang Wen-Si, Luo Yan, Fan Chuan, Li Xian-Wei
College of Fore-stry/Key Laboratory of State Forestry Administration for Forest Resources Conservation and Ecological Security in Upper Reaches of Yangtze River, Sichuan Agricultural University, Chengdu 611130, China.
Sichuan Province Key Laboratory of Forestry Ecological Engineering in Upper Reaches of Yangtze River, Chengdu 611130, China.
Ying Yong Sheng Tai Xue Bao. 2020 Sep 15;31(9):2866-2874. doi: 10.13287/j.1001-9332.202009.009.
Species composition and diversity of undergrowth vegetation community under different thinning intensities (0, 10%, 20%, 30%, 40%, 50%) were examined at the initial stage of thinning in 29-year-old plantation in the low mountain region of eastern Sichuan. The results show that all the thinning treatments could reduce the absolute dominance of and . The dominant species composition of shrubs in each treatment was different. There were more extensive species in the medium thinning intensity (20%, 30% and 40%) treatments than other treatments. The diversity indices increased first and then decreased with increasing thinning intensity. The variation degree of herbs was stronger than shrubs. The diversity indices of herbs were positively correlated with soil water content. The explanation amount of thinning intensity and soil physicochemical properties to community differentiation was 81%. The vegetation communities in the medium thinning intensity forests showed positive correlation with all the factors except total phosphorus. At the initial stage of thinning, herbaceous communities were more sensitive to disturbance than shrub communities. The 40% thinning intensity treatment was more closely related to soil environmental factors, with high stability and the most abundant species, which would be the best thinning measure under the experimental condition.
在川东低山地区29年生人工林中，于间伐初期对不同间伐强度（0、10%、20%、30%、40%、50%）林下植被群落的物种组成和多样性进行了调查。结果表明，所有间伐处理均能降低[具体物种1]和[具体物种2]的绝对优势度。各处理中灌木的优势种组成不同。中等间伐强度（20%、30%和40%）处理中的物种比其他处理更为广泛。多样性指数随间伐强度增加先升高后降低。草本植物的变化程度强于灌木。草本植物的多样性指数与土壤含水量呈正相关。间伐强度和土壤理化性质对群落分化的解释量为81%。中等间伐强度森林中的植被群落与除全磷外的所有因子呈正相关。在间伐初期，草本群落比灌木群落对干扰更敏感。40%间伐强度处理与土壤环境因子关系更为密切，稳定性高且物种最为丰富，是试验条件下最佳的间伐措施。
