摘要
利用地统计学和地理信息系统相结合的方法研究了沈阳市郊耕地1991个样本0～20cm耕层土壤交换性铁含量的空间异质性特征,绘制了交换性铁含量的空间分布图。结果表明:土壤交换性铁含量基本符合正态分布,变异函数的最佳理论模型为球状模型,交换性铁含量具有中等的空间相关性(C0与C0+C比值为41.3%,空间自相关距离为34.9km),Kriging内插图显示出交换性铁具有较强的空间异质性,其空间异质性主要受成土母质、成土过程和土壤类型等结构性因子的影响。
The spatial heterogeneity of exchangeable iron content of 1991 samples in 0～20 cm horizon in cultivated soils of Shenyang suburbs, Liaoning province was investigated, and its map was made by the methods of geostatistics combined with geographic information system. Data of exchangeable iron fitted normal distribution, and its semivariogram fitted a spherical model. Semivariograms indicated that the spatial dependence of exchangeable iron content was mediate with the ratio of nugget to sill of 41.3%, and spatial dependence range of 34.9 km. The strongly spatial heterogeneity of exchangeable iron, showed by a Kriged interpolated map, was fundamentally influenced by structural factors such as parent material, soil formation process and soil type.
出处
《水土保持学报》
CSCD
北大核心
2003年第1期119-121,共3页
Journal of Soil and Water Conservation
基金
国家"863"计划重大课题(2001AA246021)
中国科学院沈阳生态实验站开放站基金课题资助(K09SDSYZ0204)
