Comparison of water drainage and nitrate leaching calculated by soil water balance model and dynamic process model
Comparison of water drainage and nitrate leaching calculated by soil water balance model and dynamic process model
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发表时间：
2004
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通讯作者：
Huo Ke-lin
中科院分区：
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作者：
Huo Ke-lin
根据华北平原曲周县3块1hm 2样地的田间实测资料，采用土壤水分平衡模型（SWB）和土壤水分动态过程模型（NO3-N）计算了土壤水分流失和硝态氮淋失。1998/1999年土壤排水量和硝态氮淋失量分别为191~202 mm和38~63 kg·N/hm 2。当采用施肥法时，其施肥量范围分别为168~234 mm和27~53 kg·N/hm 2。差异的原因是土壤水分平衡法考虑了土壤上向和非饱和水的流动，而土壤水分平衡法没有考虑土壤水分的流动，土壤水分平衡法需要大量的田间数据，主要用于研究田间氮素循环，评价水氮利用效率，优化土壤水氮管理。而土壤水平衡需要的野外数据很少，因此可以计算土壤的排水量和硝态氮淋溶量。土壤水分平衡法是一种精度不高的农田土壤水氮管理方法。
Based on the field data from the three plots of one hectare in Quzhou County on North China Plain,water drainage and nitrate leaching are calculated with a soil water balance model (SWB) and the dynamic process model (DPM). Quantities of water drainage and nitrate leaching calculated by the SWB method range from 191～202 mm and 38～63 kg·N/hm~2 in 1998/1999 respectively. When the DPM method is used, they range from 168～234 mm and 27～53 kg·N/hm~2 respectively. The cause for the difference is that the upword and unsaturated water flow is taken into account by the DPM method, but not by the SWB method.The DPM method needs lot of field data, mainly to study nitrogen cycle in field, assess water and nitrogen usage efficiency and optimize management soil water and nitrogen fertilizer. But the SWB needs few field data to calculate the quantities of water drainage and nitrate leaching. The SWB is a good method for management soil water and nitrogen fertilizer in fields without high precision.