Spatial Heterogeneity of Soil Nutrients in Blacksoil, China—A Case Study at Hailun County
Spatial Heterogeneity of Soil Nutrients in Blacksoil, China—A Case Study at Hailun County
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发表时间：
2004
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通讯作者：
Zhao Jun
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作者：
Zhao Jun
应用地统计学与地理信息系统技术相结合的方法，对黑龙江省海伦县0~20 cm表层土壤养分的空间异质性进行了处理和分析。在海伦县中心农田采集了65个土壤样品。结果表明，全C和全P的半方差函数符合高斯模型，全N和全K的半方差函数符合指数模型。分析表明，大尺度土壤全碳和全氮的空间相关性中等，块金/总氮在25%~75%之间，因此全碳和全氮的变化既受结构性因素的影响，也受随机因素的影响。全K和全P的空间相关性较强，块金/席尔比均小于25%，因此全K和全P的变化主要受结构性因素的影响。土壤全碳和全磷具有较高的空间相关性，将地统计学方法得到的空间变异结果与1978年海伦农田土壤肥力调查结果进行了比较。研究结果对指导中国东北地区农业生产战略规划、指导施肥、控制黑土侵蚀退化具有重要意义。
Geostatistics combined with geographical information system(GIS) techniques were applied to a treatment and analysis of the spatial heterogeneity of soil nutrients in topsoil(0—20cm) at Hailun County of Heilongjiang Province. Sixty-five soil samples were collected from the central farmland of Hailun County. The results indicate that the semivariogram of total C and total P are best described by the Gaussian model; total N and total K are best described by the exponential model. Analysis shows that the spatial correlation of total C and total N at this large scale is moderately dependent, with Nugget/Sill were between 25%～75%; therefore changes in total C and total N are affected by both structural and random factors. The spatial correlation of total K and total P is highly dependent, with Nugget/Sill were less than 25%; therefore, changes in total K and total P are mainly affected by structural factors. There is high spatial correlation between total C and P. Spatial variability results from the geostatistics method were compared to soil fertility survey in 1978 results from Hailun farmland. The analysis is useful to inform strategic planning of farm production, to guide fertilizer application and to control soil erosion and degradation of Blacksoil, in northeastern China.