Effect of Drainage System Design and Operation on Nitrate Transport
Effect of Drainage System Design and Operation on Nitrate Transport
复制标题
排水系统设计和运行对硝酸盐迁移的影响
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
J. Gilliam
中科院分区：
文献类型：
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作者：
R. Skaggs;J. Gilliam
摘要 计算机模拟模型 DRAINMOD 经过修改，可预测高地下水位人工排水土壤中硝酸盐的迁移情况。假设地表径流、地下排水和渗流水中的硝酸盐浓度是恒定的，并且与这些高地下水位土壤上玉米-大豆轮作的排水系统设计无关。年度硝酸盐总流出量是根据替代排水系统设计和操作程序确定的。结果表明，几种不同的排水系统设计可以满足通行性和作物保护要求。对于本研究中考虑的排水不良的土壤，满足排水目标的系统之间的 NO3-N 流出量存在三倍的差异。在冬季和生长季节使用受控排水可以减少通过排水离开田地的硝酸盐量。然而，如果控制排水系统使用不当，可能会导致硝酸盐流出量总体增加。
ABSTRACT THE computer simulation model, DRAINMOD, was modified to predict nitrate movement from artificial-ly drained soils with high water tables. Nitrate concentra-tions in surface runoff, subsurface drainage and seepage waters were assumed to be constant and independent of the drainage system design for a corn-soybean rotation on these high water table soils. Total annual nitrate outflow was determined for alternative drainage system designs and operational procedures. The results showed that trafficability and crop protection requirements can be satisfied by several different drainage system designs. For the poorly drained soil considered in this study, there was a three-fold difference in NO3-N outflow among systems that satisfied drainage objectives. The amount of nitrate that leaves the field through drainage waters can be reduced by using controlled drainage during the winter months and during the growing season. However if the controlled drainage systems are not used properly an overall increase in nitrate outflow may result.