荒漠草原植物多样性分布格局对微地形尺度环境变化的响应

发布时间：2018-05-15 08:22

  本文选题：荒漠草原 + 地统计学　； 参考：《水土保持学报》2016年04期

【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(CV1),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(CV1),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。
[Abstract]:By using geostatistics method, three typical "sand cover and erosion" microtopography and landform of desert steppe free grazing grassland were used to study the distribution pattern of grassland plant diversity on soil nutrients in different microtopography and geomorphology areas. Response of environmental factors such as litter and sheep feces, surface microelevation and so on. The results showed that the ratio of surface area to slope area was 70%, the variation of surface elevation was of moderate variation intensity, the content of coarse sand in surface soil was 80, the vegetation coverage was 20, the litter, total phosphorus and total nitrogen of soil were observed. The spatial heterogeneity distribution pattern of plant diversity is deeply influenced by surface microelevation. The slope area ratio of microtopography is 50, the variation of surface elevation belongs to intensity variation (CV1), the content of coarse sand in surface soil is 70. When vegetation coverage is 40, total phosphorus in soil and surface microelevation significantly affect the distribution pattern of plant diversity. Wind erosion of desert steppe resulted in the spatial redistribution of various abiotic elements due to the formation of "covered sand and erosion" microtopography, which significantly affected the spatial heterogeneity of plant community diversity. Under the constraints of different microtopography and geomorphology characteristics, the distribution pattern of plant diversity is the result of the interaction of various abiotic elements, but the degree of response to different environmental elements is quite different. This difference is likely to be closely related to grazing disturbance intensity.
【作者单位】： 宁夏大学农学院;宁夏大学西北土地退化与生态恢复国家重点实验室培育基地/西北退化生态系统恢复与重建教育部重点实验室;
【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)
【分类号】：S812
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本文编号：1891701