林分密度对西孟杨人工林林下植被和土壤性质的影响[j]。

Q3 Environmental Science
Xian Huang, Xin-Xiao Yu, Guo-Dong Jia, Xiao-Min Chang, Li-Bo Sun
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引用次数: 0

摘要

为了了解不同林分密度(450、600、750、950、1100棵·hm-2)下28年小白杨人工林0-20和20-40 cm土层的林下植被的理化性质,研究了林分密度对林下植物物种多样性和土壤理化性质的影响。结果表明:林下几乎没有灌木;林下植被共发现草本植物18科30属38种。草本植物以苏柏科、豆科、禾本科、芸苔科和菊科为主。随着林分密度的增加,草本植物群落Margalef丰富度指数(DM)、Simpson优势度指数(DS)、Shannon多样性指数(H)和Pielou均匀度指数(E)均呈现先上升后下降的趋势,在林分密度为600棵·hm-2时达到最大值。随着林分密度的增加,两层土壤养分总体呈先增加后降低的趋势,最大值均出现在600棵·hm-2时。土壤全氮、全磷、碱解氮、速效磷、速效钾含量与林下草本物种多样性指数呈正相关。在0 ~ 20 cm土层,土壤全氮和速效磷含量与DM、DS、H、e呈极显著正相关,全磷含量与DS、H呈极显著正相关,碱解氮与DS呈极显著正相关。在20 ~ 40 cm土层,土壤容重与DM、DS、H、e呈显著负相关,土壤全磷含量与DM、DS、H、e呈显著正相关,土壤速效钾与DM、H呈显著正相关,600棵·hm-2的林分密度是该地区柽柳人工林的最佳林分密度,可提高林下草本物种多样性。为林下植被提供良好的生长空间,提高土壤肥力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
[Effects of stand density on understory vegetation and soil properties in Populus simonii plantations].

We investigated the understory vegetation, determined the physicochemical properties at 0-20 and 20-40 cm soil layers in 28-year-old Populus simonii plantations under different stand densities (450, 600, 750, 950, 1100 trees·hm-2) in Zhangbei County, Zhangjiakou City, Hebei Province, aiming to understand the effects of stand density on species diversity of understory plants and soil physicochemical properties. The results showed that there were almost no shrubs in the understory. A total of 38 species, 30 genera, 18 families of herbaceous plants were observed in the understory vegetation. The dominate herbaceous plants were from the Cyperaceae, Fabaceae, Gramineae, Brassicaceae, and Compositae. When the stand density of P. simonii increased, Margalef richness index (DM), Simpson dominance index (DS), Shannon diversity index (H), and Pielou evenness index (E) of the herbaceous plant communities rose first but then declined, and peaked at the stand density of 600 trees·hm-2. The overall trend of soil nutrients in the two soil layers increased first and then decreased with increasing stand density, and the maximum value all appeared at 600 trees·hm-2. The contents of soil total nitrogen, total phosphorus, alkali-hydrolyzable nitrogen, available phosphorus, and available potassium positively correlated with understory herbaceous species diversity index. In the 0-20 cm soil layer, soil total nitrogen and available phosphorus contents were significantly positively correlated with DM, DS, H and E. Soil total phosphorus content had significant positive correlation with DS and H. There was a significant positive correlation between alkali-hydrolyzable nitrogen and DS. In the 20-40 cm soil layer, soil bulk density had a significant negative correlation with DM, DS, H, and E. Soil total phosphorus content had a significant positive correlation with DM, DS, H, and E. There was a significant positive correlation between soil available potassium and DM and H. The stand density of 600 trees·hm-2 was the optimal one for P. simonii plantations in this region, which could improve understory herbaceous species diversity, provide good growth space for understory vegetation, and enhance soil fertility.

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应用生态学报
应用生态学报 Environmental Science-Ecology
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2.50
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