农田土壤水分实用模式初探  

A PRACTICAL SIMULATION MODEL FOR CROPPED SOIL WATER PREDICTION

作　　者：申双和[1] 金龙[2] 周英[1] 张谋草 

机构地区：[1]南京气象学院,南京210044 [2]江苏省气象科学研究所,南京210008 [3]庆阳地区气象局,甘肃745000

出　　处：《气象科学》1996年第3期240-248,共9页Journal of the Meteorological Sciences

摘　　要：根据土壤水分运动方程建立了旱地农田土壤水分动态数值模拟模式，该模式利用作物发育期和一些参数估算作物根系深度和相对根密度垂直分布动态变化，避免过去必须对根系进行测定的困难，增强了模式的应用性能。通过参数敏感性检验和模式应用效果分析表明，该模式可用于干旱、半干旱气候区农田土壤水分预测，为分析作物水分利用和确定农田灌溉量提供科学依据。模式所需的输入为初始土壤含水量、土壤物理常数、作物播种期、逐日平均气温、相对湿度和降水量。In this paper,a practical model for dynamic soil water of winter wheat crop was established on the basis of the water movement equation. Both dynamic maximum rooting depth and relative root density profile were estimated in this model from crop's developmental dates including some parameters,which refrains from measuring root density and makes the model easy to apply. Simulation and sensitivity testing showed that this model could meet well the requirements for cropped soil water prediction in arid and semi - arid climate regions. The desired input parameters were soil physical constants, crop' s developmental date,initial soil water content and daily air temperature,relative humidity and precipitation.

关 键 词：土壤水分 实用模式 相对根密度 

分 类 号：S152.7[农业科学—土壤学]