甘肃西峰冬小麦土壤水分动态及其对作物产量影响

本文利用甘肃省西峰市农业气象试验站非灌溉地冬小麦田间土壤水分资料、气候资料，分析了不同年型农田土壤水分的时空变化特征，从土壤水分平衡方程出发，讨论了冬小麦返青至成熟期间降水量、作物耗水量、渗漏量和土壤储水量变化各平衡分量的动态变化及其相互关系。对冬小麦产量与不同作物发育期的作物耗水量之间进行相关普查，结果表明影响小麦产量最显著的时段是拔节～孕穗期。分别运用物理统计和经验统计方法建立了冬小麦产量与作物耗水量的关系模型，认为后者模拟效果较好。

A PRELIMINARY STUDY ON SOIL WATER CHANGE AND ITS IMPACT ON YIELD OF WINTER WHEAT

Characterized variations of soil water in time and depth for non - irrigatedwinter wheat,were compared among different climate-type years with cllmate data and other measurements coming from Xifeng Agrometeorological Experimental Station, GansuProvince. Based on soil water balance equation, dynamic change of water components andtheir interrelation were discussed during the time from green returning to ripening. A generalinvestigation of correlation was made between wheat yield and water consumption for severaldevelopmental phases and showed that the yield was most significantly influenced during elongation to booting. Yield-water consumption models were established by use of physicaland empirical statistical methods respectively and the latter approached better results.