黄土丘陵沟壑区不同立地条件草本群落物种多样性与生物量研究  

Species Diversity and Biomass of Herbosa at Different Site Conditions in the Hilly-gullied Loess Plateau

作　　者：寇萌[1] 焦菊英[2,3] 杜华栋[3] 王志杰[3] 王巧利[4] 苏嫄[4] 

机构地区：[1]西北农林科技大学林学院,陕西杨陵712100 [2]西北农林科技大学水土保持研究所,陕西杨陵712100 [3]中国科学院水利部水土保持研究所,陕西杨陵712100 [4]西北农林科技大学资源环境学院,陕西杨陵712100

出　　处：《西北林学院学报》2013年第1期12-18,共7页Journal of Northwest Forestry University

基　　金：国家自然科学基金重点项目(41030532);中国科学院重要方向项目(KZCX2-EW-406)

摘　　要：以黄土丘陵沟壑区张家河、麻地沟流域草本群落为研究对象,分析物种多样性、地上生物量、枯落物量随立地条件的变化趋势及三者间的相互关系。结果表明,物种数表现为阴梁峁坡>阴沟坡>峁顶>阳梁峁坡>阳沟坡,Margalef指数表现为阴梁峁坡>阴沟坡>阳沟坡>阳梁峁坡>峁顶,物种数和Margalef指数在不同立地条件下有极显著或显著差异;Shannon-Wiener指数与Pielou指数在阳坡由坡下到坡上呈减少趋势,在阴坡由坡下到坡上呈增加趋势,但差异不显著;地上生物量表现为阳沟坡>阴沟坡>阳梁峁坡>阴梁峁坡>峁顶,不同立地条件的差异不显著;枯落物量表现为阳沟坡>阳梁峁坡>峁顶>阴梁峁坡>阴沟坡,阳沟坡分别与阴梁峁坡、阴沟坡差异显著;由于多种因素的综合作用,物种多样性指数、地上生物量、枯落物量相互之间的相关性并未达到显著水平。Taking the herbosa occurring in different site conditions in Zhangjiahe and Madigou watersheds located on the hilly gullied Loess Plateau in northern Shaanxi as research objects, species diversity, above- ground biomass and litter amount under different site conditions, as well as their relationships were ana- lyzed. The results showed that the number of species was in the order of shady ridge slope〉shady gully slope〉ridge top.sunny ridge slope〉sunny gully slope,Margalef index was in the order of shady ridge slope〉shady gully slope〉sunny gully slope〉sunny ridge slope〉ridge top,and extremely significant or significant differences were found among them. In the sunny slop, Shannon-Wiener index and Pielou index decreased fro they were no m gully slope to ridge slope, while increased from gully slope to ridge slope in shady slope, but t significantly different. Above ground biomass was in the order of sunny gully slope〉shadygully slope〉sunny ridge slope〉shady ridge slope）ridge top,and the differences were not significant. Lit- ter amount was in the order of sunny gully slope〉sunny ridge slope〉ridge top.shady ridge slope〉shady gully slope, but only reached significantly different level between sunny gully slope and shady ridge slope, and shady gully slope. As a result of the comprehensive function of many factors, the relationships among species diversity index,above-ground biomass and litter amount were not significantly different.

关 键 词：黄土丘陵沟壑区 立地条件 草本群落 物种多样性 生物量 

分 类 号：Q948.15[生物学—植物学]