半湿润易旱区一年两作农田土壤水分动态及水分利用率的提高  

A Study of Improving Water Use Efficency with Two Crops m One Year in Semihumid Areas Susceptible to Droughts

作　　者：曹学昌[1] 王法宏[1] 赵君实[1] 任德昌[1] 

机构地区：[1]山东省农业科学院作物研究所

出　　处：《干旱地区农业研究》1991年第1期59-65,共7页Agricultural Research in the Arid Areas

摘　　要：1985—1988年,在半湿润易旱区的济南、昌乐、章丘、沂水、乐陵等市(县),定位定时对一年两作条件下的旱地土壤水分动态和提高降水利用率的途径进行了研究。结果表明:旱地土壤水分的动态变化一年内可以明显地分为四个时期;土壤水分的垂直运动很有规律;土层深厚的旱地一年两作可充分有效地利用降水;增施肥料、培肥地力是提高降水利用率的有效途径。In the years of 1985-1988,soil water dynamics in rainfed land and the way of im-proving rainfall water use efficiency with two crops in one year were studied through thefixed-position and time experiments conducted in Jinan,Changluo,Zhangqui,Yishui andLuoling located in the semihumid areas susceptible to droughts.Results from the studiesindicated that the changing dynamics of soil water in rainfed land can be apparently di-vided into four periods in a year,and that the vertical movement of soil water was regular,and the rainfed land with deep soil layer can make full use of rainfall water to produce twocrops in one year.Also,increasing fertilizer application and bettering soil fertility can be theeffective way to improve rainfall water use efficency.

关 键 词：土壤 水分 动态 利用率 湿润区 

分 类 号：S152.7[农业科学—土壤学]