荒漠草原物种多样性与植物群落地上现存量的关系
摘要： 探究不同放牧强度下物种多样性与植物群落地上现存量的关系可以反映出植物群落稳定性的变化，进一步反映出放牧管理的合理性。为此本研究以短花针茅(Stipa breviflora)荒漠草原为研究对象，结合放牧强度和年际间降雨量变化，探讨物种多样性与植物群落地上现存量的关系，得到的初步结论如下：伴随放牧强度增大和年度降水量减少，植物群落地上现存量、物种丰富度指数下降，优势度指数上升。在物种多样性与植物群落地上现存量的关系中，CK(对照)与LG(轻度放牧)存在类似的影响过程，MG(中度放牧)与HG(重度放牧)存在类似的影响过程，且在LG和MG区之间存在阈值效应。在不同物种多样性指数和植物群落地上现存量的关系中，首先会受到丰富度指数的影响，其次是多样性指数、均匀性指数和优势度指数。
关键词: 荒漠草原, 短花针茅, 物种多样性, 植物群落地上现存量, CCR模型
Abstract: Exploring the relationship between species diversity and aboveground standing crop of plant communities under different grazing intensities can reflect the changes in plant community stability and further reflect the rationality of grazing management. Therefore,this study took Stipa breviflora desert steppe as the research object,combined with grazing intensity and interannual precipitation changes,to explore the relationship between species diversity and aboveground standing crop of plant communities. The preliminary conclusions are as follows. With the increase of grazing intensity and the decrease of annual rainfall,the aboveground standing crop of plant community and species richness index decreased,and the dominance index increased. In the relationship between species diversity and aboveground standing crop of plant community,CK (Control) and LG (light grazing) have similar influence processes,MG (Moderate grazing) and HG (Heavy grazing) have similar influence processes,and there is a threshold effect between LG and MG areas. In the relationship between different species diversity indexes and aboveground standing crop of plant community,it is first affected by richness index,followed by diversity index and dominance index.
Key words: Desert steppe, Stipa breviflora, Species diversity, Standing crop of plant community, CCR model
中图分类号:
S812
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