北京市顺义区浅层土壤硝态氮的空间变异特征分析

顺义是北京市的主要水源地和农业生产基地,研究氮素在顺义区土壤中的分布累积及空间变异情况,对于了解顺义区的土壤潜在污染,指导农业生产,预防面源污染等具有重要作用.因此,本研究应用传统统计学方法和基于GIS的地统计学法研究了顺义区不同地点各土层土壤中硝态氮的空间分布特征.结果发现,地统计分析过程中,在考虑各向异性和趋势效应的情况下,各土层土壤硝态氮含量均具有空间相关性,理论变异模型主要为球状模型和指数模型.同时,选用普通Kriging插值法得到了各土层土壤硝态氮的空间分布图,并对其空间分布特征进行了分析.结果表明,研究区不同土层硝态氮空间分布状况各异,潮白河东部土壤硝态氮含量高于潮白河西部.

Spatial variability of nitrate content in different soil layers in the Shunyi District of Beijing

Shunyi is an important water resource and agricultural production base of Beijing. Studies on the nitrogen accumulation in soil and its spatial variability are significant to understand the potential pollution in soil, and guide agricultural practice to prevent non-point source pollution. Traditional statistics and geostatistics based on GIS were used to analyze the spatial distribution of nitrogen in different soil layers. Considering the anisotropy and trend effects, the nitrate content in different soil layers are all spatially correlated. The theoretical variogram models of spherical and exponential forms fit the data well. Spatial distribution maps of nitrate content for the research area were created by ordinary Kriging interpolation. The results showed that the nitrate had a strong variability among the different layers, and in general, the nitrate content in the east part is higher than that in the west.