豫东平原冬小麦Jensen模型中敏感指数的年际变化

Year-to-Year Variations of Sensitivity Index in Jensen Model for Winter Wheat in Eastern Area Plain of Henan Province

作物阶段蒸发蒸腾量与产量函数模型是缺水条件下进行非充分灌溉决策和灌溉管理的理论基础。作物不同生育期缺水对产量的影响可用作物阶段水分敏感指数λi 来表示。敏感指数λi 大 ,缺水对产量的影响就大 ,反之亦然。利用豫东平原冬小麦 6年的灌溉试验资料 ,以冬小麦生育期ET0 资料为基础 ,分析研究了Jensen模型中λi 的年际变化 ,建立了ET0 和λi

Crops′ stage evapotranspiration and productive function model are the theoretical foundation for carrying out deficient irrigation decision and irrigation management under condition of water shortage. The effect of water shortage in different growth stage on crop′s product, can be expressed with moisture sensitivity indexes λ\-i of respective crop growth stage. If the sensitivity index is larger, thus the effect of water shortage on product is larger; and the sensitivity index is smaller, the effect is smaller. Taking winter wheat′s irrigation test data of six years in East Area Plain of Henan Province, and based on ET\-0 data of winter wheat growth, the year to year variation of λ\-i in Jensen model are analyzed and researched; then the the functional relations between ET\-0 and λ\-i are established.