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(0～20cm)交换性镁含量的空间变异性特征 ,绘制了交换性镁含量的空间分布图。结果表明 :土壤交换性镁含量符合正态分布 ,变异函数的最佳理论模型为球状模型 ,交换性镁含量具有中等的空间相关性(C0 与C0+C比值为55.0 %) ,但空间自相关距离较大(73.1km) ,影响其空间变异的结构性因子主要是成土母质、河流走向以及土壤类型。
The spatial variability of exchangeable magnesium content in0-20cm horizon in cultivated soils of Shenyang suburbs,Liaonˉing,China,was investigated,and its distribution map was drawn by the methods of geostatistics combined with geographic information system.Data of exchangeable Mg fitted normal distribution,and semivariogram fitted a spherical model.The semivariogram indicated that exchangeable Mg content was mediately spatially dependent with the ratio of nugget to sill of55.0%,its spatially dependent range was73.1km,and structural factors that affected its spatial variability were parent materials,river location and soil types.
出处
《沈阳农业大学学报》
CAS
CSCD
2003年第3期181-184,共4页
Journal of Shenyang Agricultural University
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(K09SDSYZ0204)资助
