土壤全氮含量和分布特征研究

Research on Soil Total Nitrogen Content and Distribution Characteristics

施用氮肥是提高农作物产量的关键措施,但同时也会引起土壤和河流环境污染;因此,研究区域土壤中全氮含量和分布特征,对土地资源利用、提高氮肥利用率具有重要意义。以山西中南部某县土壤为研究对象,对土壤表层全氮含量、垂直剖面分布特征进行研究。结果表明,该区域土壤表层全氮平均值为0.9582g/kg,比全国土壤背景值(0.64g/kg)高出49.7%;在土壤垂直剖面层上,随着深度的增加,土壤全氮含量逐渐减少;土壤全氮与有机质两者之间具有较好的线性关系。

In order to obtain higher output,the key measure is the application of nitrogen fertilizer;But it also causes soil and river environmental pollution;Therefore,The study of soil total nitrogen content and distribution characteris. tics in the region is of great significance to the utilization of land resources and the improvement of nitrogen use effi. ciency. In this paper,the soil in a county in south-central Shanxi Province was taken as the research object,and the characteristics of total nitrogen content and vertical profile distribution in the soil surface were studied. The results show that the average value of total nitrogen in the topsoil is 0.9582g/kg,which is 49.7% higher than the national background value(0.64 g/kg). On the vertical profile of soil,with the increase of depth,the content of total nitrogen in soil decreases gradually;There is a good linear relationship between total nitrogen and organic matter.