盐渍农田“地下水效益区间”的内涵、研究重点及展望

The concept,scientific issues and prospect of the groundwater benefit zone in the saline farmland

以地下水-土壤-植物-大气连续体系统水盐迁移过程为研究对象,解析了地下水文过程和农田生态系统的关键驱动因素和互馈过程,提出了地下水效益区间的新概念;详述了地下水效益区间的形成机制及其模型模拟方法;从盐渍农田水盐耦合运移机制、尺度效应、量化模型、地下水位调控等方面展望了地下水效益区间研究的科学问题及其挑战。

This paper focuses on the processes of water and salt movements in the groundwater-soil-plant-atmosphere continuum(GSPAC)system.First,it analyzes the key driving factors and mutual feedback mechanisms of the groundwater hydrological process and farmland ecosystem and proposes a new conception of groundwater benefit zone(GBZ).Secondly,it elaborates on the formation mechanisms of the groundwater benefit zone and the model development for simulation of the GBZ.Finally,based on the saline farmland water-salt coupling transport mechanism,scale effects,quantitative model of GBZ,and technical parameters of regional groundwater and salt regulation and control,the scientific issues and challenges related to the research framework of GBZ are prospected.