荒漠草原2种群落灌丛堆土壤水分的空间特征

发布时间：2018-04-10 05:33

本文选题：荒漠草原　切入点：植被群落　出处：《西南农业学报》2017年04期

【摘要】：【目的】为阐明植被群落与土壤水分空间异质性的关系。【方法】以荒漠草原2种灌丛堆为对象,运用地统计学方法研究了不同灌丛堆(白刺、沙蒿)3种生境(冠下、冠缘、空地)及不同土层土壤水分的空间异质性(c.v.)。【结果】结果表明:土壤水分的空间异质性明显,不同群落类型土壤含水量之间的差异表现为不同群落类型之间大于同一群落不同生境大于同一群落同一生境不同土层,其含水量最大差异分别为162.28%、74.66%、97.44%,在空地20~40 cm土层中,沙蒿沙堆土壤含水量达到白刺的2.62倍;在同一群落之间土壤含水量和水分空间异质性表现为空地冠缘冠下;在同一群落同生境中随着土层深度的增加,土壤水分含量增加,变化明显,异质性增大。【结论】荒漠草原自然形成的沙堆微地形地貌引起各非生物要素在空间上的重新分配作用,显著影响土壤水分空间异质性特征。
[Abstract]:[Objective] to elucidate the relationship between vegetation and soil moisture spatial heterogeneity. [method] with desert grassland 2 Boscage as the object, studies the different Boscage by the methods of geostatistics (Nitraria, Artemisia) in 3 habitats (crown, crown margin, space) spatial heterogeneity and different soil moisture the (C.V.). [result] the results showed that the spatial heterogeneity of soil moisture is obvious, the difference of soil moisture between different community types among different community types than the same communities in different habitats in the same community than the same habitat in different soil layers, the maximum moisture content differences were 162.28%, 74.66%, 97.44%, in open 20~40 cm soil layer, Artemisia sand soil moisture reached 2.62 times of Nitraria; in the same community between soil moisture and water spatial heterogeneity of space under the crown crown margin; in the same community in the same habitat with soil depth The soil moisture content increased significantly, and the heterogeneity increased. [Conclusion] the redistribution of abiotic factors in the deserts in the desert steppe resulted in the spatial heterogeneity of soil water.

【作者单位】：宁夏大学西北退化生态系统恢复与重建教育部重点实验室;宁夏大学西北土地退化与生态恢复省部共建国家重点实验室培育基地;宁夏大学西部生态与生物资源开发联合研究中心;宁夏大学科学技术处;
【基金】：国家自然科学基金项目(31460123,41101301,31260581) 教育部科学技术研究项目(413060)
【分类号】：S812

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