我国拥有的大量滨海盐碱地，其开发利用是我国中低产田改造重要内容和解决粮棉争地矛盾主要出路。环渤海盐碱地旱涝盐碱等逆境胁迫严重阻碍棉花产量提高。本课题组研究表明，“池-田”改进模式显著缓解环渤海盐碱地逆境胁迫，但提高棉花产量的生理生态机理尚不清楚。本项目从环渤海盐碱地“池-田”改进模式棉田地下水变化及土壤水盐运移等理化性质和水盐在棉株体内分布入手，研究环渤海“池-田”改进模式棉花光合性能和物质积累与分配的变化，阐明环渤海“池-田”改进模式影响盐碱地棉花产量形成的生态机理；在此基础上，通过播种、密度等栽培技术提高铃期群体光合生产和运输分配效率，探寻充分挖掘光合增产潜力的生理机理与途径。研究结果对丰富盐碱地植棉理论体系具有重要意义，同时为探寻环渤海盐碱地抗逆高产棉花生产技术途径提供重要理论参考。

Large area of coastal saline-alkali land is covered in China, whose development and utilization will be the main contents of improving medium and low-yield fields and the solution to resolve the planting contradictory between cotton and grain in China. The stress threatens in Bohai rim saline-alkali area, such as salinity-alkalinity, drought and waterlogging etc. severely inhibit and the yield improvement in cotton. Present research results showed that the improved model of “pool and raised-bed” significantly alleviated the adversity stress threaten in Bohai rim saline-alkali area. However, the physiological ecology mechanism of yield improvement in cotton was not clear. According to the change of groundwater and the soil physicochemical properties of water-salt migration under the improved model of “pool and raised-bed” and the distribution of water-salt in cotton, this project will study the photosynthetic performance in cotton and the variation of mass accumulation and distribution, expound ecology mechanism of photosynthetic production affected by the improved model of “pool and raised-bed”. Based on these researches, the canopy photosynthetic production and the transportation and partitioning efficiency of photosynthate will be improved by combining with sowing and density techniques, and the physiological mechanisms and the yield potential will be exploited fully in the pathways of photosynthetic production improvement.This research will be significant importance to enrich the theoretical system of cotton plantation in saline-alkali soil and provide important theoretical reference for improving the production technology of stress-resistant and high yield cotton in Bohai rim saline-alkali area.