Large-scale changes of landscape structure cause the degradation of functions of storage and drainage in watershed wetland, which are reflected by loss of flood holding capacity, increase of surface runoff and decrease of confluence time etc.

• 景观结构的巨大改变引起了流域湿地贮、排水功能的衰退，主要表现为滞洪、消能空间的丧失，径流量的增加和汇水时间缩短等。