非充分灌溉条件下土壤水分控制指标及节水效益分析  

Soil Water Control and Water Saving Benefit Analysis of Indicators in Non-sufficient Irrigation

作　　者：王永亮 张家兴 韩奎学 

机构地区：[1]河北省衡水水文水资源勘测局,河北衡水053000

出　　处：《南水北调与水利科技》2011年第A01期98-100,107,共4页South-to-North Water Transfers and Water Science & Technology

摘　　要：在供水充足的条件下，将土壤相对湿度控制在60%-85％之间，适时进行灌溉，是一种比较理想的灌溉方式。但在水资源十分短缺的河北中部平原区显然并不具备这样的条件，只能采取适当延长灌溉问次，允许作物在某一时段遭受适度水分亏缺，在不影响作物产量的前提下最大限度节约水资源，即非充分灌溉。经研究，在本地区灌溉下限从土壤相对湿度60％下调至45％，灌溉问次可延长1／3以上，并能保证作物正常生长不受影响。根据水量平衡原理推算出了灌水定额的计算公式，根据作物生长期和墒情确定适当的灌溉次数，并对非充分灌溉节水效益进行了分析。Under adequate water supply and the soil relative humidity control at from 60%-85%, timely irrigation is an ideal way to irrigate. However, the shortage of water resources in Central Hebei Plain do not have such conditions,only an appropriate extension of irrigation can be taken between the irrigation times to allow crops at a time to expose water deficit, in the premise of without influence to crop yields and maximizing conservation of water resources, that is non-sufficien＇c irrigation. This study shows if the irrigation limit of the region lowers the soil relative humidity from 60% to 45%, between the irrigation times can be extended over one third,and can ensure normal growth of crops. Based on the water balance principle we calculate a formula for irrigation quota. According to the crop growing season and moisture we determine the appro priate irrigation frequency,and analyze water saving effectiveness of non st^fficient irrigation.

关 键 词：土壤相对湿度 田间持水量 灌溉上限 灌溉下限 节水效益 

分 类 号：TP29[自动化与计算机技术—检测技术与自动化装置]