渭北旱塬西部作物水肥产量耦合效应研究  

Coupled Effect for Supplies of Water and Nutrients to Crop in the West of Weibei Rainfed Tableland

作　　者：刘文兆[1,2] 李玉山[1,2] 

机构地区：[1]中国科学院水利部水土保持研究所 [2]西北农林科技大学,陕西杨陵712100

出　　处：《水土保持研究》2003年第1期12-15,共4页Research of Soil and Water Conservation

基　　金：国家自然科学基金项目 (4 9890 3 3 0);国家科技攻关项目 (2 0 0 1BA5 0 8B18)

摘　　要：通过在渭北旱塬西部长武塬区所进行的玉米水肥两因子五水平试验 ,就作物水肥产量耦合效应进行了研究。在给出玉米水 -肥生产函数的基础上 ,推出了养分优化供应条件下玉米水分生产函数 ,阐明了水肥供应坐标面上产量、耗水量与水分利用效率等值线分布特征 ,并应用水分生产弹性系数 ,以产量与水分利用效率为目标 。The coupled effect for supplies of water and nutrients on maize was studied through an experiment of water and fertilizer factors with respective five levels in Changwu, Weibei rainfed tableland. Based on the empirical functions of maize yield ( Y ) and water consumption ( ET ) under different regimes of water and fertilizer supplies, the paper produced a maize water production function with dynamic optimal management of fertilizer supply, and clarified the characteristics of isograms of maize yield and water consumption and water use efficiency in the coordinate plain of water and nutrient supply.The coupled zones for optimum supplies of water and nutrients to maize, for high yield and water use efficiency, were obtained by the elasticity of water production (EWP), and the geometrical features of the coupled zones were discussed.

关 键 词：作物水肥产量效应 节水农业 水分利用效率 玉米 渭北旱塬 

分 类 号：S152.7[农业科学—土壤学] S158.3[农业科学—农业基础科学]