摘要
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 the same trend. Ordination technique of canonical correspondence analysis （CCA） was used to examine the relationship between the communities and environmental factors. Results showed that environmental factors compositively affected the distribution and variety of communities, among which organic matter, abandonment ages, clay particle content, aspect, altitude, nitrate nitrogen had main effects on the change of typical communities of abando- ning land at the level of p 〈 0.01. Multi-analysis and pathway analysis indicated that total phosphorus had the largest direct positive effect on the ecological dominance of communities; total nitrogen and organic matter respectively had the largest direct positive effect on underground biomass and aboveground biomass .
出处
《水土保持学报》
CSCD
北大核心
2008年第3期64-69,共6页
Journal of Soil and Water Conservation
基金
中国科学院西部行动计划项目(KZCX2-XB2-05-02-03)
国家科技支撑重点项目(2006BAD09B03)
关键词
物种多样性
环境因子
典范对应分析
黄土丘陵区
species diversity
environmental factors
canonical correspondence analysis
loess hilly region
作者简介
武春华（1981-），女，在读硕士，从事生态学研究。E--mail：wuchunhua05@mails．gucas．ac．cn
通讯作者E-mail：ymchen@ms．iswc．ac．cn
