绿州灌区麦田节水高产适宜土壤水分指标研究

土壤水分适宜指标是节水高产栽培的基础。本文采用二次回归旋转设计和回归分析方法，研究了麦田土壤水分的变化特征及其与主要水分生理因子的相关性，认为０～６０ｃｍ 是影响春小麦生长和产量的主要层次，并与叶水势、蒸腾强度和气孔阻力之间存在极显著的相关关系。在此基础上，研究提出了产量高于１２０００ｋｇ／ｈｍ ２ 和水分生产率大于１２．４５ｋｇ／ｍ ｍ ．ｈｍ ２ 时不同生育阶段适宜土壤水分下限指标。经示范印证，具有很强的可行性

A Study on Soil Moisture Criteria for Water saving and High yield in Spring Wheat in West Gansu Province

In this paper, the characteristics of soil moisture change and the relationship between soil moisture and some physiological factors concerning plant water status were studied, based on data from a field experiment with quadratic regression rotation design. Results show that upper layer of 60 cm in soil profile is the activist and most important area for influence to growth and yield of spring wheat. The relationship between stomatal resistance/transpiration rate/leaf potential with soil moisture in upper layer of 60 cm are significant. This paper also presents the optimal soil moisture criteria for each growing stage for spring wheat fields with yield of higher than 12000 kg/hm 2 and water use efficiency of greater than 12.45 kg/(mm·hm 2). Case study shows that the criteria system is practicable in spring wheat production in west Gansu.