Division of grouped landforms by Fuzzy cluster analysis in Yanhe basin of Shaanxi province;

Study on the Development Threshold of Water Resources in Yanhe Basin Based on the Eco-environmental Water;

A Study of the Eco-environmental Water Demand and the Sustainable Utilization of Water Resource in Loess Plateau--A Case on YanHe Basin;

Floristic characteristics of seed plants and its spatial distribution in Yanhe River Basin;

The characteristics of land use pattern and the dynamics of Yanhe River basin were investigated by using the land use data in 1985 and 2000,and the methods of GIS and landscape ecology.

The state-of-the-arts of industrialization of soil and water conservation in Yanhe River Basin are investigated by using qualitative and quantitative method on the basis of field research and collecting real data.

Taking Yanhe River watershed as an example,regionalization of vegetation restoration was studied by using GIS technique.

This evaluation index system and its mathematical model are applied to the Yanhe watershed.

A series of practices of soil and water conservation have been carried out in Yanhe watershed in recent decades as well as the massive construction of returning the sloping farmland to forest and grass lands in recent years, and the obvious effects are obtained.

For the sustainable exploitation of Karst groundwater in Yanhe spring basin,this paper calculated the karst groundwater resources by the use of discharge method at two series such as 1956 to 2000 and 1980 to 2000,and the recharge method is also used to give a check.

Three water supplies have been planned in upstream areas of Yanhe spring basin in order to provide water for exploiting coal in the future.