中文摘要：

根据喀斯特流域多孔介质与裂隙水流特征,建立了达西流、裂隙渗流与槽蓄汇流演算相结合的混合汇流演算模式,实现了对分布式水文-植被-土壤模型（DHSVM）的改进。利用贵州普定喀斯特生态水文试验站陈旗小流域观测资料,对模型计算的流量过程及植被截流、蒸散发及土壤含水率时空分布进行验证。结果表明,模型能较好地模拟喀斯特流域陡涨、陡落的流量过程。同时,模型能模拟出土壤含水率、实际蒸散发与降雨、下垫面岩溶裂隙、植被覆盖的响应关系,对分析中国南方喀斯特地区下垫面变化条件下的生态水文效应具有重要意义。

英文摘要：

On the basis of the characteristics of the porous and fissure water flow in the karst watershed, a mixed runoff rout- ing method integrating interactions of the Darcy flow, fissure flow and channel storage routing, is developed and used to im- prove the Distributed Hydrology-Soil-Vegetation Model （DHSVM）. The improved model is applied in a small watershed of Chenqi with in the Puding Karst Ecohydrological Observation Station, Guizhou province. The model is calibrated and validated based on the observation data of the stream flow, the vegetation interception, the evapotranspiration and the soil moisture. The results show that this improved DHSVM is able to simulate the observed hydrograph with sharply raised and recessed flow char- acteristics, as well as evapotranspiration and soil moisture. The improved DHSVM is also able to simulate soil moisture content and evapotranspiration as well as their interactions with precipitation, karst fracture and vegetation cover. This study is very useful for analyzing the eco-hydrological processes and the eco-environmental effects with the changing land cover and land use in the Karst region Southern China.