摘要
采用地统计学方法,以荒漠草原自由放牧草地3种典型"覆沙—侵蚀"微地形地貌为对象,研究不同微地形地貌区域草地植物多样性分布格局对土壤养分、地表枯落物和羊粪量、地表微高程等环境因子的响应。结果表明:微地形坡面面积比例>70%,地表微高程变化属中等变异强度(CV<1),表层土壤粗沙粒含量为80%,植被盖度为20%时,地表枯落物、土壤全磷和全氮、地表微高程深刻影响着植物多样性空间异质性分布格局。微地形坡面面积比例为50%,地表微高程变化属强度变异(CV>1),表层土壤粗沙粒含量为70%,植被盖度40%时,土壤全磷、地表微高程显著影响植物多样性分布格局特征。荒漠草原风蚀作用形成的"覆沙—侵蚀"微地形地貌引起各非生物要素在空间上的重新分配作用,显著影响植物群落多样性的空间异质性特征。不同微地形地貌特征约束条件下,植物多样性分布格局是各非生物要素共同作用的结果,但对不同环境要素的响应程度存在较大差异,这种差异性很可能与放牧干扰强度存在密切相关性。
A geostatistical methods was used to test the resloonse of spatial pattern of plant diversity to environmental factors in the scale of micro landform in desert steppe. The results showed that litter biomass, soil total phosphorus and micro elevation had significant effect on the spatial pattern of plant diversity when the slope area ratio was greater than 70%, the variation of micro elevation in the ground surface was moderate （CV〈1）, the coarse sediment particle content of soil surface was about 80% and the vegetation coverage was about 20%. However, the spatial pattern of plant diversity was influenced greatly by soil total phosphorus and micro-elevation when the slope area ratio was about 50%, the variation of micro-elevation in the ground surface was significant, the coarse sediment particle content of soil surface was about 70% and the vegetation coverage was about 40%. The spatial pattern of plant diversity was a result of a combination of different factors. But the response degree of spatial pattern of plant diversity to different environmental factors greatly differed under different micro-landform area, which may be correlated to the grazing disturbance intensity in desert steppe.
出处
《水土保持学报》
CSCD
北大核心
2016年第4期274-280,328,共8页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(41461046)
国家重点基础研究发展计划前期专项(2012CB723206)
关键词
荒漠草原
地统计学
空间异质性
植物多样性
desert steppe
geostatistics
spatial heterogeneity
plant diversity
