摘要
运用土壤水动力学方程反求根系吸水率,分析玉米拔节期梯形剖面取根资料,建立有效根密度分布函数,结合土壤剖面水分分布,建立适合浅松覆盖条件下的二维根系吸水率模型,并应用田间实测数据进行验证。结果表明,模拟值与实测值平均相对误差3.75%～7.11%,满足土壤水分动态模拟精度要求。
Water intake ability by root plays the indispensable role in dynamic simulation of soil water movement.Base on soil water dynamics equations,this paper comprehensively estimates root-water-uptake rate by using back calculation method,the same time analysis of corn root profile information,establishment of an effective root density distribution function,combined with the soil profile water content distribution establishment the two-dimensional model of root water absorption for surface tillage with mulch.Consequently,the applicability of the root water absorption model on soil moisture dynamic change was verified with the data of experiments.The results showed that the average relative error between simulated and observed values was 7.11% to 3.75%,and the method is reasonable and feasible which can satisfy the precision in soil moisture dynamic simulation.
出处
《灌溉排水学报》
CSCD
北大核心
2011年第4期76-79,共4页
Journal of Irrigation and Drainage
基金
辽宁省教育厅高等学校科学技术研究项目(2004D207)
关键词
浅松覆盖
二维
根系吸水模型
数值模拟
surface tillage with mulch
two-dimensional
root water absorption model
numerical simulation
