DNDC模型在农田氮素渗漏淋失估算中的应用  

Application of DNDC model in estimating cropland nitrate leaching

作　　者：李虎[1] 王立刚[1] 邱建军[1] 

机构地区：[1]中国农业科学院农业资源与农业区划研究所,北京100081

出　　处：《应用生态学报》2009年第7期1591-1596,共6页Chinese Journal of Applied Ecology

基　　金：公益性行业(农业)科研专项(200803036);公益性科研院所基本科研业务费资金项目(2007-1;2008-12)资助

摘　　要：采用田间原装渗漏计测定了山东省济南市典型种植模式下,2008年冬小麦整个生长季水分和氮素淋失量,并利用该数据对DNDC(DeNitrification-DeComposion)模型进行检验和敏感性分析.结果表明:模型对该地区农田土壤水分运动的模拟效果较好,模拟结果的精度总体上可以接受,但对氮素淋失量的模拟结果存在一定偏差,冬小麦整个生长季的氮素淋失量模拟值(18.35kg N.hm-2)比实测值(14.89kg N.hm-2)高3.46kg N.hm-2,相对偏差在20%左右,模型参数尚需作进一步调整.模型敏感性分析显示,农田氮素淋失更易受到灌水量和施肥量的影响.DNDC模型在该地区有一定的适用性.The leaching amount of soil water and nitrate from winter wheat field under typical planting system in Jinan City of Shandong Province was measured with lysimeter during the whole growth season in 2008, and the feasibility of applying DNDC model to estimate this leaching amount was tested by the obtained data. On the whole, DNDC model could better simulate the soil water movement in the crop field, with the accuracy being acceptable. However, there existed definite deviation in the simulation of nitrate leaching. The simulated value （ 18.35 kg N·hm^-2） was 3.46 kg N·hm^-2 higher than the observed value （14.89 kg N·hm^-2） , with a relative error of about 20% , which suggested that some related parameters were required to be further modified. The sensitivity test of DNDC model showed that cropland nitrate leaching was easily to be affected by irrigation and fertilization. It was proved that the model had definite applicability in the study area.

关 键 词：农田系统 土壤水分运动 氮淋失 DNDC模型 

分 类 号：S158[农业科学—土壤学]