黄土丘陵区典型群落特征及其与环境因子的关系

研究了安塞县黄土丘陵区4种典型群落分布、物种多样性、生物量变化与环境因子的关系。结果表明,所选群落的盖度和地上、地下生物量随退耕年限增加而明显增加,土壤水分、粘粒含量也有增加趋势;典范对应、多元回归和通径分析表明,群落的分布及变化受环境因子综合影响,土壤有机质、恢复年限、粘粒含量、坡向、海拔、硝态氮含量等是影响退耕地典型群落特征及分布的主要因子;土壤全磷含量对生态优势度,有机质、全氮含量分别对地上、地下生物量有最大正效应。本研究为黄土丘陵半干旱区退耕地植被恢复重建提供了理论依据。

In order to provide scientific basis for vegetation restoration and reconstruction of removal lands in hilly-gully region,based on the data of Ansai in the typical semiarid loess hilly-gully region,we studied the effects of environmental factors on the community distribution,species diversity and biomass in four typical communities.The results showed that coverage,aboveground biomass and underground biomass increased a lot with the increase of abandoned time,soil water content and clay particle content had ...