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基于GIS和地统计学原理,对丹江口水库水源区黄水河小流域土壤养分空间分布及其与地形因子间的关系进行分析.结果表明:研究区土壤全氮、全磷、有机质的变异系数分别为51%、66%和85%,为中等变异,土壤速效磷的变异系数为161%,属强变异;土壤全氮和有机质表现为显著正向空间自相关,速效磷和全磷的空间自相关性较弱;海拔是影响该区土壤养分分布的主要因素,其对全氮、全磷和有机质都具有极显著影响,坡度和剖面曲率显著影响全氮和有机质分布.建立了地形因子与土壤养分含量空间分布的回归预测方程,并进行了数字化制图输出,为研究区土壤资源的精确管理提供了数据支持.
Based on the theory of GIS and geostatistics, the spatial distribution of soil nutrients and its relationship with the topographic factors in Huangshui River watershed in the source area of Danjiangkou reservoir were analyzed. The results showed that the coefficients of variation of total nitrogen, total phosphorus and organic matter in the study area were 51 %, 66% and 85%, respectively. The coefficient of variation of soil available phosphorus was 161%, which was a strong variation. The total nitrogen and organic matter of soil showed significant positive spatial autocorrelation, and the spatial autocorrelation of available phosphorus and total phosphorus Weakness and elevation are the main factors affecting the distribution of soil nutrients in this area, which have a very significant effect on total nitrogen, total phosphorus and organic matter, slope and section curvature significantly affect the distribution of total nitrogen and organic matter. Spatial regression regression prediction equation, and the digital mapping output, which provided data support for the accurate management of soil resources in the study area.