The problem of water shortage on Huang-Huai-Hai(HHH) Plain is becoming serious day by day,at the same time it has become a main factor of restricting land ecosystem.

• 水资源短缺也是广大平原地区土地生态服务功能减弱的主要因素,成为全面建设小康社会所要求的生态环境质量的主要制约因素。