摘要
对面积约0.15km2的古尔班通古特沙漠南缘土壤风蚀强度与其抑制因子进行取样检测,应用地统计学方法对取得数据进行了半方差函数分析。结果表明:该研究区土壤风蚀强度与其抑制因子(植被盖度、土壤含水量)的实测数据均服从正态分布,其中植被盖度变异函数曲线的理论模型符合指数模型,而土壤含水量和土壤风蚀强度指数变异函数曲线的理论模型符合球状模型。通过对2009年5月监测资料的分析,得出试验区植被盖度、土壤含水量、土壤风蚀强度指数在空间上存在显著的变异性,土壤风蚀强度与其抑制因子之间存在着较强的负相关性,即土壤风蚀强度指数随着植被盖度和土壤含水量的增大(或减小)有减小(或增大)的趋势,因此土壤风蚀强度对植被盖度和土壤含水量具有较强的空间依赖性。在风力空间差异不大的小尺度范围内,干旱区土壤风蚀强度的大小主要取决于植被盖度和土壤含水量的大小。植被盖度与土壤湿度则是抑制土壤风蚀的主要因子,也是保持古尔班通古特沙漠南缘沙面稳定的主导因子。
Sampling and testing were conducted on the sandy soil erosion intense and its inhibiting factors in the 3 408km2 of south Kurbantonggut desert,and semi-variograms function analysis was made afterwards on the data obtained by the application of geo-statistics.Results showed the data of the sandy soil erosion intense and its inhibiting factors for actual measurement submitted to the normal distribution.The variance curves of the soil water content and the sandy soil erosion displayed a spherical model,while the curve of the vegetation coverage exhibits an exponential in the area.Analysis of monitoring data from 2009indicated that the vegetation coverage,soil water contents,and sandy soil erosion varied spatially in this area.The sandy soil erosion intense decreased（or increased）in the spatial scale,while that the vegetation coverage and the soil water contents increased（or decreased）,the sandy soil erosion intense highly depended on the vegetation coverage and the soil water contents.Therefore,the vegetation coverage and the soil water contents are the key factors inhibiting sandy soil erosion intense,they are also the critical factors preserving stability of south Kurbantonggut desert.
出处
《水土保持研究》
CSCD
北大核心
2010年第4期24-28,33,共6页
Research of Soil and Water Conservation
基金
国家自然科学基金(40601019)
关键词
古尔班通古特沙漠南缘
土壤风蚀强度
抑制因子
空间变异
South Kurbantonggut Desert
sandy soil erosion intense
inhibiting factors
spatial variation
