Introduction of subsistent rice cropping harmonized with the water environment and human activities in seasonal wetland

安哥拉上游流域的洪水形成的季节性湿地是西南非洲沙漠国家纳米比亚中北部人口稠密的特征。本研究旨在在季节性湿地地区引入水稻种植，那里的水资源以前从未用于农作物生产。然后，对半干旱地区水资源开发与水环境保护的协调性进行了检验。结果表明，水稻种植有可能与现有的以珍珠粟为主的传统种植方式相结合，低产水平的水稻种植不会改变水环境。

Seasonal wetland formed by the flood water from the upper catchments of Angola is the characteristics of densely populated north central Namibia, the desert southwest African country. This study aimed to introduce rice cropping in the seasonal wetland region where the water resources have not been used for crop production before. Then, harmonization between the water resource development and conservation of water environment of semiarid region was tested. The results indicated that rice cropping can be possibly integrated with the existence pearl millet based traditional cropping, and that water environment would not be modified by the subsistent rice cultivation with low yield level.