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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 field original leakage meter was used to determine the water and nitrogen leaching loss of winter wheat in the whole growing season in 2008 in Jinan, Shandong Province. The DNDC (DeNitrification-DeComposion) model was tested and the sensitivity was analyzed. The results showed that the model had a good effect on the simulation of farmland soil water movement and the accuracy of the simulation results was generally acceptable. However, there was a certain deviation in the simulation results of nitrogen leaching loss. The nitrogen leaching amount Compared with the measured value (14.89kg N.hm-2), the simulated value (18.35kg N.hm-2) is 3.46kg N.hm-2, the relative deviation is about 20%, and the model parameters need to be further adjusted. Analysis shows that nitrogen leaching in farmland is more likely to be influenced by irrigation amount and fertilizer application, and DNDC model has some applicability in this area.