Assessment on Investigation Results of Topsoil s Available B and Available Mo in Wanchuan River Basin;

Research on the evaluation model of water and sediment variation in Sanchuanhe River Basin of loess plateau;

The precipitation variation and its effect on runoff in Sanchuanhe river basin in the recent 30 years;

According to the actual land use in 2000,the average rainfall of many years,combining the indexes of water storage in sub-region 2 of the first pair of districts of loess hilly and gully regions,the potential indexes of rainwater resource utilization are determined,the potential are calculated,and the development degree of rainwater resources in Sanchuanhe River basin is analyzed and appraised.

A case study on the evolutionary law of water resources in Sanchuan river basin;

Benefit analysis of runoff storage and silt detention in the work of soil and water conservation in Sanchuan River Basin in recent 30 years;

Hydrological Effects of Different Species Arrangement Models of Converted Farmland to Forest in Beichuanhe Watershed;

Soil effects of converted farmland in remote hilly areas in Beichuanhe Watershed;

Floristic characteristics of seed plants in Beichuanhe basin of upper reach of Yellow river;

The study on anti-erodibility in the Beichuanhe Basin of Datong County, a national experimental site for conversion from cropland into forest land and grassland, shows that all the 12 anti-erodibility indexes can be divided into 4 categories, i.