摘要
本文选取了干旱区有代表性的污水灌溉地区-乌鲁木齐市雅玛里克山，结合GIS，采用地统计学方法研究了污水灌溉区域土壤中的pH、有机质、CEC、总盐、全N、全P、全K7种土壤肥力指标的空间变异陛，并采用普通克立格法绘制了各种土壤肥力要素含量的空间分布格局图。结果表明：有机质、总盐、全N、全K的理论模型为指数模型；CEC、全P的理论模型为高斯模型；pH的理论模型为球状模型；pH、有机质、总盐、全N、全K的块金值与基台值之比都在25％以下，说明空间自相关作用强，其含量分布受结构性因素控制；CEC、全P的块金值与基台值之比在25％～75％之间，为中等强度的空间相关性，其分布是由结构性因素和随机性因素共同作用的结果。土壤肥力的相关距变化范围为246．0～2100．0m。
In this paper, the representative wastewater irrigated region in arid area of Yamalic Mountain in Urumqi was selected to investigate the spatial variability of soil fertility by applying Geostatistics combined with GIS. Seven soil fertility elements in wastewater irrigated region were measured including pH, organic composition, CEC, total salt, total nitrogen, total phosphor and total kalium. The distribution patterns of different soil fertility parameters are obtained through a normal Kriging method. The results showed that theoretical semivariogram models of organic composition, total salt, total nitrogen and total kalium were best described with an Exponential model. CEC and total phosphor were best described with a Gaussian model while pH was best described with a Spherical model. The ratios of nugget to sill of pH, organic composition, total salt, total nitrogen and total kalium were under 25%, which indicated that the spatial correlations were all strongly spatially dependent and the spatial varia- bility was primarily controlled by structural factors of parent material. CEC and total phosphor were moderately spatially dependent because the ratio of nugget to sill was 25% - 75%. Both structural factors and the random factors equally affected the spatial variability of them. The range of correlation distance in all soil fertility was 246.0 ～2100.0m.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2008年第8期185-191,共7页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(批准号:40671195和90502008)
科学技术部重点国际合作项目(批准号:2002CB714004)资助
关键词
污水灌溉
土壤肥力
地统计学
空间变异
克立格插值
wastewater irrigation
soil fertility
Geostatistices
spatial variation of soil
Kriging method
