Field test of a modified numerical model for water uptake by root systems
Field test of a modified numerical model for water uptake by root systems
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DOI：
10.1029/wr010i006p01199
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发表时间：
1974-12
影响因子：
5.4
通讯作者：
R. Feddes;E. Bresler;S. P. Neuman
中科院分区：
文献类型：
--
作者：
R. Feddes;E. Bresler;S. P. Neuman
将通过仔细的红甘蓝根部吸水水平衡研究获得的数据与从尼玛和汉克斯的修改数值模型获得的结果进行比较。在修改后的模型中，土壤表面的空气干燥水分含量可能会随着时间的推移而变化，具体取决于气象条件。最大可能蒸散率是通过考虑气象条件和作物特性来计算的。引用的数据表明根汇系数有时可能随深度呈指数变化。模拟了 7 周的时间，计算出的每周湿度剖面与现场测量的数据并不完全一致。另一方面，计算的蒸发和蒸腾累积速率与现场数据非常吻合。当使用原始模型而不进行建议的修改时，这些比率与现场数据的一致性不太好，这表明其中一些修改实际上提高了模型的预测能力。
Data obtained from careful water balance studies on water uptake by the roots of red cabbage are compared with results obtained from a modified numerical model of Nimah and Hanks. In the modified model the air dry moisture content at the soil surface may vary with time depending on meteorological conditions. The maximum possible rate of evapotranspiration is calculated by considering both meteorological conditions and crop properties. Data are quoted to suggest that the coefficient of the root sink may sometimes vary exponentially with depth. A period of 7 weeks was simulated, and the calculated weekly moisture profiles did not agree completely with those measured in the field. On the other hand, the calculated cumulative rates of evaporation and transpiration were in excellent agreement with the field data. When the original model was used without the suggested modifications, the agreement of these rates with the field data was not as good, an indication that some of these modifications actually improve the predictive capabilities of the model.