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采用地统计学与GIS相结合的方法,研究了四川省双流县土壤氮素空间分布特征及其影响因素.结果表明:土壤全氮和碱解氮含量具有中等空间相关性,其空间相关距离分别为15480m和26980m.土壤全氮含量高值区主要位于北边的九江、新兴两镇,低值区主要位于东南方向的合江、三星两镇;土壤碱解氮含量从北向南递减趋势比较明显.灰色冲积物上发育的土壤全氮和碱解氮含量均显著或极显著高于紫色岩风化物和老冲积物;水稻土全氮和碱解氮含量均极显著高于黄壤和紫色土;地形条件对土壤全氮和碱解氮含量的影响程度不同,但均以丘陵最低;不同土地利用方式下,水田全氮和碱解氮含量均显著或极显著高于旱地和果园;土壤氮素高值区施肥量明显高于低值区.
The spatial distribution of soil nitrogen and its influencing factors in Shuangliu County of Sichuan Province were studied by means of geostatistics and GIS.The results showed that there was a moderate spatial correlation between soil total nitrogen and alkali-hydrolyzable nitrogen, and their spatial correlation distances were Which is 15480m and 26980m, respectively.The total nitrogen content of the soil is mainly located in the Jiujiang and Xinxing towns in the north, and the low value areas are mainly located in the two towns of the Hejiang and the Sanxing southeast. The soil alkali-hydrolyzable nitrogen decreases gradually from north to south. Soil total nitrogen and alkaline hydrolysis nitrogen content in gray alluvial soil were significantly or extremely significantly higher than those of purple rock weathering and alluvial sediments; Total nitrogen and alkaline hydrolysis nitrogen in paddy soil were significantly higher than that in yellow soil and purple soil; Under different land use types, the contents of total nitrogen and alkali-hydrolyzable nitrogen in paddy fields were significantly or extremely significantly higher than those in dry land and orchards; the soil nitrogen content was high The value of fertilization was significantly higher than the low value area.