Hydrological responses to land-use changes in karst area— A case study in Houzhai river, Guizhou Province

Selecting Houzhai underground river basin as a study area, a sinkhole-based semi-distributed karst hydrologic model, which is based o the analysis of ecological environment features and karst water formation mechanism, was proposed and the impact of land-use and vegetation cover changes on the catchment runoff and the relationship between yield flow parameter and confluence flow parameter in Houzhai catchment, Guizhou province was discussed by means of field investigation, data collection and modern spatial technology as well as geography information system and remote sensing technology in this paper. It is proved that after the eco-construction other flow yield parameters change little except the maximum soil moisture storage, confluence flow parameter changed little too and get less than that before eco-construction basically. It is also proved that, under the constant rainfall, flow yield decrease and the runoff which is under the vegetation coverage becomes smaller at low water level and becomes larger at high water level after the eco-construction.