环溪河流域土壤氮素含量及影响因素分析

An Analysis of Content of Soil Nitrogen and Its Influential Factors in Huanxi River Drainage Area

根据67个随机格网样点和分层抽样样点的耕层土壤氮素含量，在ArcGIS9．0平台上运用地统计学等方法研究了环溪河流域土壤氮素含量及其影响因素。结果表明，环溪河流域土壤全氮和碱解氮的平均含量分别为0．60g／kg和53．31mg／kg。研究区土壤全氮含量总体上呈条带状和团块状分布，其低值中心区（〈0．5g／kg）位于团结村不规则三角形区域，并以此为中心向四周增加；高值中心区（〉0．8g／kg）主要位于走马村椭圆状区域。区内土壤碱解氮其高值区（〉75mg／kg）主要分布在深弯村以西，低值区（〈33mg／kg）主要分布于窝窝店村和杨柳村一带。影响区内土壤氮素含量空间分布的因素主要是成土母质、土壤质地、土地利用方式、地貌和坡度。

According to the chemical analysis data of soil nitrogen content which was from the 67 random grid and hierarchical sampling points in topsoil, based on software ArcGIS9.0, geosatistics was used to analyze the content of soil nitrogen and its influential factors in Huanxi River drainage area, such as geostatistics. The results indicates- that the average content of soil total nitrogen （STN） and soil available nitrogen （SAN） are 0.60 g/kg and 53.31 mg/kg, respectively. In the study area, STN contentdistributes in zonal and block shapes. The lowest value regions （ 〈0.5 g/kg） distributein an abnormal triangle shapein Tuanjie Village, and the STN contentin creases around from this center; the highest value regions （ 〉0.8 g/kg） of STN content mainly distribute inellipses districtin Zouma Village. In the study area, thehighest value regions （ 〉 75 mg/kg） mainly distribute in the west part out of Shenwan Village, and thelowest value regions （ 〈33 mg/kg） mainly distribute in Wowodian Vii/age and Yangliu Village. The main influential factors of soil nitrogen special distribution in the research are a aresoil derive, soil texture, land using form, physiognomy and slope.