论文部分内容阅读
以新疆精河流域为研究对象,运用GIS和地统计学的原理与方法,对该区域的pH、水溶性盐分、速效钾、有效磷、碱解氮、有机质等土壤质量要素的空间分异规律进行了定量分析。结果表明:1)流域内土壤质量要素的空间异质性明显,人类的干预程度严重影响土壤的空间异质性;各土壤质量要素的空间变异程度不同,其排列顺序依次为有效磷>有机质>碱解氮>速效钾>电导率>pH值。2)六种土壤质量要素变异函数理论模型不同:pH的理论模型很好的符合线性模型,有机质、速效钾和电导率的理论模型很好的符合指数模型,有效磷和碱解氮则也较好的符合球状模型。3)六种土壤质量要素在南北、东西、东北-西南、西北-东南四个方向上的各向同性表现的范围不尽相同:碱解氮和电导率在不同方向上都表现出各向同性;pH、有机质和速效钾次之,在南北、东西和东北-西南三个方向上的变异函数的变化大致相同,在西北-东南方向上波动较大;有效磷在各个方向上的空间变异程度都很大,这主要是由于艾比湖湖岸-绿洲-荒漠-山地一线(西北-东南方向)地质、地貌等自然因素差异悬殊造成的。
Taking Jinghe River Basin in Xinjiang as the research object and the principles and methods of GIS and geostatistics, the spatial heterogeneity of soil quality elements such as pH, water-soluble salt, available potassium, available phosphorus, alkaline hydrolysis nitrogen and organic matter in the area was studied Quantitative analysis. The results showed as follows: 1) The spatial heterogeneity of soil quality elements in the basin was obvious, and the degree of human intervention seriously affected the spatial heterogeneity of soils. The spatial variability of soil quality elements was different. The order of their sequence was available phosphorus> organic matter> Nitrogen> available potassium> conductivity> pH value. 2) The theoretical model of the six soil quality factors is different: the theoretical model of pH is in good agreement with the linear model, and the theoretical model of organic matter, available potassium and conductivity is in good agreement with the exponential model. Good fit spherical model. 3) The ranges of isotropic behavior of the six soil quality elements in four directions: north-south, east-west, northeast-southwest, northwest-southeast, are not the same: Both alkaline hydrolysis nitrogen and conductivity show isotropy in different directions , followed by pH, organic matter and available potassium followed by similar changes in the three directions of North, South, East and West-Northwest-Southwest and large fluctuations in Northwest-Southeast, and the spatial variability of available phosphorus in all directions This is mainly due to the disparity in natural factors such as the geology and physiognomy of Lake Aibi from the lakeshore-oasis-desert-mountainous line (northwest-southeast).