摘要
通过野外调查与室内分析,探讨了不同退化程度的大针茅草原植物群落特征及物种多样性。结果表明:随着退化程度的增加,大针茅草原植物群落结构、生产力和多样性的表现并不同步;各样地重要值在所有物种中呈分散趋势,均以多年生植物为主,但多年生植物的重要值呈减少趋势,一年生植物和小半灌木重要值呈增加趋势;群落地上生物量、群落高度及凋落物含量显著降低,而群落密度呈相反的趋势。群落盖度和地下生物量在轻度退化样地最高,地下生物量由浅到深呈"T"形分布;Margalef指数在中度退化样地最大,Shannon-Wiener指数、Simpson指数、Pielou指数都随退化程度的增大呈逐渐增大趋势。
The community structure and plant species diversity of Stipa grandis steppe in different degradation degrees were studied through field investigation and data analysis. The results showed that the community structure,productivity and diversity performance were not synchronous with the increasing of degradation degree. Importance values in all species showed a trend of dispersion. Various plots were dominated by perennial plants.The importance values of perennial plants exhibited an decreasing tendency,and annuals plants and shrub importance values exhibited an increasing tendency. Plant community aboveground biomass,community height and litter were significantly reduced,while community intensity showed the opposite trend. Community coverage and underground biomass in the lightly degraded plot were the highest. Underground biomass distribution from surface soil layer to deep layer was ＂ T＂ shaped. Margalef index in the moderate degraded plot was the largest. With the increasing of degradation degree,Shannon- Wiener index,Simpson index and Pielou index all showed increasing trend.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2016年第3期106-111,共6页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(41301302
41361012)资助
关键词
大针茅草原
退化程度
植被特征
物种多样性
锡林河流域
Stipa grandis steppe
degradation degree
vegetation characteristics
species diversity
Xilin river basin
