摘要
针对目前绿洲内部土壤盐渍化问题,以三工河流域绿洲为研究区,运用遥感、GIS和地统计学相结合的方法研究了0～20cm土层盐分含量的空间异质特征,结果表明:流域尺度上土壤含盐量的理论变异函数拟合符合指数模型,F检验达到极显著水平,在1.5～15km的中尺度上具有强的空间变异性和自相关性,Kriging插值及其与同期的景观类型图叠加运算表明,整个绿洲区南部老绿洲土壤盐化面积及作用小于北部新绿洲,耕地景观类型的盐化作用及其面积强于其他景观类型,新绿洲盐化面积高于老绿洲,新绿洲耕地中有38.81%土地面积受盐害作用,而老绿洲仅为8.54%。
Aiming at the problem of soil salinization existed inside oasis, a case study was carried out on the oasis at the Sangong River catchment. Spatial variability of soil salinity in the topsoil （0 -20cm） and its relationship with landscape structure were studied with the combination of methods in geo-statistics, GIS and RS. The result revealed that： on catchment scale, the spatial variation in soil salinity was best fitted by exponential model, with F-test showed high level of confidence. At the spatial case of 1. 5 - 15km, variation in soil salinity showed strong spatial correlation and selfcorrelation. Mapping of soil salinity by Kriging and comparing it with landscape maps showed that area of soil salinization in old oasis is smaller than that in new oasis, and degree of soil salinization in old oasis is also lower than that in new one. Among all landscapes, cropland was mostly affected by salinity, with 38.8% of the cropland in new oasis moderately affected by soil salinity, and 8.54% in old oasis.
出处
《生态学报》
CAS
CSCD
北大核心
2007年第12期5262-5270,共9页
Acta Ecologica Sinica
基金
中国科学院西部之光项目
亚洲太平洋区环境创新战略项目(APEIS)环境综合监测子课题~~
关键词
地统计学
空间异质性
GIS
绿洲
geo-statistics
spatial variability
GIS
oasis
soil salinity
