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氮素是作物的主要限产因子之一。遥感监测土壤氮素营养对于及时快速掌握农田肥力状况,合理施肥意义重大。植被指数在监测地表植被覆盖中发挥着重要作用,水田植被覆盖种类单一,其它影响因素少,这使得通过植被指数监测水稻长势,间接监测土壤肥力状况变得可行。文章利用中巴-2号卫星的CCD的归一化植被指数对南京溧水县水田的土壤全氮含量进行了估测,表明遥感估测土壤氮素含量是有可能性的。文章并对遥感估测水田土壤全氮含量的技术体系进行了探索和研究,提出了一套遥感估测土壤元素含量的技术体系。
Nitrogen is one of the main limiting factors for crops. Remote sensing monitoring of soil nitrogen nutrition for timely and rapid grasp of farmland fertility status, rational fertilization is significant. The vegetation index plays an important role in monitoring the vegetation cover of the surface. The vegetation cover of the paddy field is single and the other factors are few. This makes it feasible to monitor the rice growth through the vegetation index and indirectly monitor the soil fertility. In this paper, the normalized vegetation index (CCD) of CMB-2 satellite was used to estimate the total nitrogen content of paddy soils in Lishui County, Nanjing, indicating that it is possible to estimate the soil nitrogen content by remote sensing. In this paper, the technical system for estimating total nitrogen content in paddy soil by remote sensing has been explored and studied. A set of technical system for remote sensing estimation of soil element content has been proposed.