棉田控制排水土壤含水量预测

Cotton field soil water content prediction in controlled drainage

以棉田水分为主要研究对象,通过观测控制排水与自由排水对照小区不同土层土壤体积含水量,对2008年棉花生育期间土壤含水量数据进行线性回归分析,建立控制排水条件下农田分层体积含水量预测模型.用2009年同期数据进行检验,效果较好.表明控制排水措施能有效减少0～40cm内土层土壤水分流失,控制水位越高田间水分含量变化越小.

A field contrastive experiment about controlled drainage and free drainage was carried out to study the water content in the soil profile.A linear regression was applied for building a function that used for predicting water content in the deeper soil profile.Data in 2009 are used to validate the precision of the function;and the results show that it＇s feasible for prediction.In conclusion,controlled drainage reduces the water losses from the 0-40 cm layer significantly.Higher the controlled water table is more stable the water content is.