In lIuangfuchuan basin

thc climate is arid and precipitation is start0. Its wegetation has been destroyed severely. The desert area of land is increasing gradually year by year

and a large number of land can not be utilized for agriculture and forest as well as animal husbandry

The distribution of skeleton soil

for example

rocky soil and sandy soil

surpasses gp percent of the total area in the region. The physical properties of soil are undersirable

such as

coarse texture and the sand content as high as 70 percent of soil weight

and the smaller total porosity of soil. '1 he physical moisture content in profile means only 5-10 precept by weight. It has the poor permeability for sandy rocky soil and easily forms runoff at the time of ra:nstorm，which can lead to overflow of Huangfuchuan ri}'er and a great deal of sedimcpt will be bumped into the Yellow River by flooding water regions of serious soil sediment. In order to and water loss and the main area.Therefore

it is one of the of forming much and coarseprevent soil from eroding

it is the fundamental measures of controlling soil and water loss in Huangfuchuan basin to strengthen biological mea.sures such as planting tree and grass