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《Journal of Arid Land Resources and Environment》 2008-08
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Investigation of the Spatial Variability of Fertility in Wastewater Irrigated Soils in Yamalic Mountain,Urumqi,China

ZHANG Hui-wen1,3,MA Jian-ying1,2,CHEN Fa-hu1,LV Guang-hui3(1.Key Laboratory of Western China's Environmental Systems(Ministry of Education),Lanzhou University,Lanzhou 730000;2.Key Laboratory of Desertification,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Science,Lanzhou 730000;3.Key Laboratory of Oasis Ecology(Ministry of Education),College of Resources and Environment Science,Xinjiang University,Urumqi 830046,China)  
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 variability 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.
【Fund】: 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
【CateGory Index】: S158
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