滨海农区微咸水-淡水交替灌溉下耕层土壤结构变化规律及作物响应机理

Agricultural development have huge potential for exploitation. Because of shortage of fresh water and richness of brackish water, safe utilization of brackish water is a crucial problem to be solved for agricultural sustainable development in coastal region.At present, researchers focus on the utilization such as mixed irrigation with brackish and fresh water,and the application of those research results was restricted with seasonal shortage of fresh water in coastal area. This study will take the main crops (maize and wheat) in coastal region as research objects. Based on distribution characteristics of local water resources and combination of laboratory experiment and field trail, the mechanisms of alternate irrigation with brackish water on soil structure and crops were discussed.Based on the anlysis of experiments, the main control indicators will be put forwarded to establish the evaluation model, which is helpful to study the optimization of alternate irrigation schedule with brackish water, and summarize management mode of brackish water irrigation in coastal area. The research results would not only supply theoretical support for safe utilization of brackish water irrigation，but also provide scientific basis for agricultural sustainable development in coastal region.

滨海农区农业发展潜力巨大，但该区域淡水资源季节性缺乏、微咸水资源丰富，如何安全利用微咸水进行灌溉成为本区农业可持续发展亟待解决的问题。目前，研究者对微咸水和淡水的混合灌溉等方式研究较多，而滨海农区淡水资源的季节性缺乏影响了研究成果的推广应用。因此，本研究拟以滨海农区主要作物（玉米、小麦）为研究对象，结合滨海农区水资源分布特征，通过室内土柱模拟和野外小区试验，系统的研究微咸水-淡水交替灌溉对土壤结构的影响规律，探讨微咸水-淡水交替灌溉下作物的生理响应。在试验的基础上，提出滨海农区微咸水-淡水交替灌溉的主要控制指标，构建评价模型，进行滨海农区微咸水-淡水交替灌溉的灌溉制度优化，提出滨海农区微咸水灌溉的管理模式。本项目的研究结果可为滨海农区的微咸水安全利用提供理论支撑和农业可持续发展提供科学依据。

滨海农区农业发展潜力巨大，但该区域淡水资源季节性缺乏、微咸水资源丰富，如何安全利用微咸水进行灌溉成为本区农业可持续发展亟待解决的问题。目前，研究者对微咸水和淡水的混合灌溉等方式研究较多，而滨海农区淡水资源的季节性缺乏影响了研究成果的推广应用。因此，本项目以滨海农区主要作物（玉米、小麦）为研究对象，结合滨海农区水资源分布特征，初步研究了微咸水-淡水交替灌溉对土壤结构的影响规律，探讨了微咸水-淡水交替灌溉下作物的生理响应，可为滨海农区的微咸水安全利用提供理论支撑和农业可持续发展提供科学依据。本项目执行期间，发表论文8篇，其中SCI收录3篇，EI收录1篇；专利授权2项；培养研究4名，其中1人获研究生国家奖学金。