摘要
应用由达西定律和连续方程导出的物理模型和基于土壤水分收支的簿记(Budget)模型,分别模拟了地处半干旱地区的陕西泾阳1987年和1988年,以及甘肃天水1986年冬小麦拔节后期至成熟阶段农田土壤水分的逐日变化,与实测值相比较,两种模型均取得较好的效果。在土壤上层,物理模型精度高于簿记模型;簿记模型估算的蒸散偏大、渗漏率偏低,对根系分布的敏感性较强。
A physical model derived from Darcy's Law and the continuity equation and abudget model based on water balance are used to simulate respectively the daily changesin soil water from the jointing to maturing phases for winter wheat grown in Jingyang,Shanxi in 1987 and 1988 and Tianshui, Gansu in 1986 located in the semi-arid zone.Both the models achieve good results as compared with measured values. The physicalmodel has higher accuracy than the budget model for predicting the water content in theupper soil layer. The latter model is more sensitive to the distribution of root,but the e-vapotranspiration predicted is on the high side and the percolation predicted on the lowside.
出处
《南京气象学院学报》
CSCD
1992年第4期540-549,共10页
Journal of Nanjing Institute of Meteorology
关键词
农田土壤
水分预测
数值模拟
field soil
water content forecast
numerical simulation
