内陆河灌区保护性间作水分耦合效应及其机制研究

针对当前西北内陆河灌区水资源日趋匮乏而间套作种植耗水大问题，采用大田试验，以典型间作模式小麦间作玉米为研究对象，在小麦带采取不同保护性耕作条件下，系统研究小麦间作玉米群体的耗水特性，量化两种作物带内土壤水分的时空动态、产量表现和水分利用效率差异，明确保护性耕作对间作水分利用的影响；通过研究轮作、一膜两年用地膜覆盖及保护性耕作条件下，间作群体各组分带土壤水分、棵间蒸发时空动态，进一步明确保护性间作耗水规律；量化各处理群体组分带间土壤容重、紧实度、温度、根系时空分布、地上干物质积累、群体光合作用、产量、水分利用效率等差异，深入探讨各指标与群体水分利用间的相关关系，阐明保护性间作水分耦合高效利用的机理机制。项目成果将对进一步丰富间套作水分高效利用理论，构建保护性间作种植模式，乃至推动多熟种植发展产生积极作用。

In view of the current conflict between water scarcity increasing and great water consumption of intercropping systems in northwestern inland river irrigation region, the field experiments will be conducted to research on the water consumption features of wheat intercropping maize with different conservation tillage measures in wheat strip. In order to research the effect of different conservation tillage measures on water consumption of wheat intercropping maize, the differences of soil water, yield and water use efficiency between different treatments will be analyzed. Under the conditions of crop rotation and the no-till planting mode mulching one plastic film used for two year in maize strip with different conservation tillage measures in wheat strip, the indexes of soil water, soil evaporation, soil bulk density, soil compaction, soil temperature, root growth, the dry matter accumulation, photosynthesis, yield and water use efficiency in wheat and maize strip under different treatments will be measured, and the correlations between them and soil water utilization also will be deeply discussed, which can explain the water coupling effect and mechanism of intercropping systems with conservation tillage.The results of the project will further improve water utilization theories of intercropping system, help to construct the cropping pattern of intercropping system with conservation tillage measures, and actively promote multiple cropping system development too.