摘要
为了确定作物喷灌条件下灌水量和产量的空间结构及统计分布规律， 定量评价喷灌均匀性对作物产量的影响， 对冬小麦生育期内的冠层上、下喷灌水量、土壤水分、叶面积指数及产量的空间分布进行了监测． 试验结果表明， 在生育期内累计灌水量的相关距离约为５ｍ ， 产量的相关距离为７ ～１０ｍ ， 但叶面积指数不存在空间结构． 累计灌水量、叶面积指数和产量都可以用正态分布来表示． 尽管在冬小麦灌溉季节内喷灌均匀系数变化于５７ ％ ～８９ ％ ， 但土壤储水量均匀系数始终大于９０ ％ ． 喷灌均匀系数对作物产量的影响比预想的要小．
Sprinkler water distributions both below and abovethe crop canopy , soil moisture,leaf areaindex and yield were measured during an irrgation season of winter wheat to determine their spatialstructuresand statisticalfunctions. The experimentalresults demonstratethatthe correlative ranges ofcumulative waterapplication duringtheirrigationseason and crop yield are about5m and 7 ～10m respectively . Nospatialstructureisfoundforleafareaindex . Cumulative waterapplication , leaf areaindex and crop yield can berepresented by a normaldistribtuionfunction . Christiansen uni formity coefficientsfor waterstorage were alwaysgreaterthan 90 % thoughthesprinkeruniformities variedin therange of 57 % to 89 % during theirrigation season.
出处
《水利学报》
EI
CSCD
北大核心
2000年第1期9-14,共6页
Journal of Hydraulic Engineering
基金
国家自然科学基金!59779025
关键词
喷灌
均匀系数
土壤水分
产量
冬小麦
sprinklerirrigation
uniformity coefficient
soil moisture
yield
spatialstructure.
