民勤绿洲荒漠带土壤水分的空间分异研究

摘要/Abstract

摘要： 通过野外试验和室内分析,对民勤绿洲荒漠带土壤水分的空间分异进行了研究。结果表明,在水平方向上,土壤水分的平均最大值基本出现在绿洲区,最小值出现在绿洲荒漠过渡带。在绿洲区,土壤含水量由表层向下逐渐递增；过渡带土壤含水量呈现出表层和底层低,中间层高的特点；荒漠区土壤含水量呈现出表层和底层高,中层低的特点。土壤水分特性的变异系数最大的是过渡带,最小的是绿洲。土壤水分含量各层最佳拟合模型不尽相同。水分含量的自相关性不强,受随机因素的影响较大。

关键词: 土壤水分, 空间分异, 地统计学, 民勤

Abstract: Based on field tests and laboratory analysis, spatial heterogeneity of soil water contents in oasis-desert belt of Minqin was studied. Results show that the maximum value of soil water contents is located in oasis, and the minimum values is shown up in oasis-desert transitional belt. The soil water contents increase gradually from the surface layer to bottom layer of the soil in oasis. The soil water contents are low at surface soil layer and bottom soil layer in oasis-desert transitional belt, but it is high at middle soil layers. Vertical variation of soil water contents in desert is just opposite to that in oasis-desert transitional belt. The greatest variation coefficient of soil water contents occurs in oasis-desert transitional belt, and the smallest variation coefficient of soil water contents appear at oasis. The optical simulation models of soil water contents in different layers are not completely identical. The soil water contents has not strong spatial autocorrelation, and they are largely affected by random factors.

Key words: soil water content, spatial heterogeneity, geostatistics, Minqin

中图分类号:

S152.7

张凯;;冯起;吕永清;张勃;司建华. 民勤绿洲荒漠带土壤水分的空间分异研究[J]. 中国沙漠, 2011, 31(5): 1149-1155.

ZHANG Kai;;FENG Qi;L Yong-qing;ZHANG Bo;SI Jian-hua. Study on Spatial Heterogeneity of Soil Water Contents in Oasis-desert Belt of Minqin[J]. JOURNAL OF DESERT RESEARCH, 2011, 31(5): 1149-1155.

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