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土壤 (0～ 2 0cm)交换性钙含量的空间异质性特征 ,绘制了交换性钙含量的空间分布图。结果表明 ,土壤交换性钙含量经对数转换后基本符合正态分布 ,变异函数的最佳理论模型为球状模型 ,交换性钙含量具有很强的空间相关性 ,空间自相关距离为 15 8km 。
The spatial heterogeneity of exchangeable calcium content in 0～20?cm horizon in cultivated soils of Shenyang suburbs, Liaoning of China, was investigated, and its map was made by the methods of geostatistics and geographic information system. Data of exchangeable Ca fitted normal distribution after log transformation, and semivariogram fitted a spherical model. Semivariograms indicated that exchangeable Ca content was strongly spatially dependent on the ratio of nugget to sill of 11.7%, its spatially dependent range was 15 8?km, and its spatial heterogeneity was fundamentally affected by structural factors such as parent materials and soil types.
出处
《生态学杂志》
CAS
CSCD
北大核心
2003年第4期6-9,共4页
Chinese Journal of Ecology
基金
国家高技术研究发展计划重大项目 ( 2 0 0 1AA2 460 2 1)
中国科学院沈阳生态实验站基金资助项目 (K0 9SDSYZ0 2 0 4)
关键词
交换性Ca
土壤
空间异质性
地统计学
GIS
exchangeable calcium, soil, spatial heterogeneity, geostatisics, GIS.
