Water Conservation Efficiency Analysis To The West Of HeLan Mountain Under Returning Pasturing Area To Forest Project

Using principle of maximum capacity of forest inception storage to test forest water conservation dynamic variation in closure area in the west of HeLan Mountain from the year 2000 to 2004, and a following test in the year 2008. Mainly surrounding 5 indexes studied the influence of closing hillsides to facilitate afforestation to HeLan Mountain, and also assessing its value. The main conclusions are:1. Returning pasturing area to forest project contributes to the composition and water storage of litter. In 5 years, the litter weights 1.38t/hm~2, and its maximum water holding weights 3.92t/hm~2. The maximum water holding capacity of litter can be 2-3times compares to its dry weight.2. Returning pasturing area to forest project contributes to soil physical properties and its water storage capacity. From the year 2000 to 2004, the mean value of soil noncapillary porosity, soil capillary porosity and soil total porosity respectively increases 2.43%,11.13% and 13.55%;he mean value of soil maximum water holding capacity increases 677.5 t/hm~2.3. The water value of open channel changes a lot. From the year 2004 to 2004, some open channels changes from having no effluent water to have some seasonal water, or from seasonal water to perennial water. In the year 2000, the forest maximum water holding weights 171650175t, in the year 2004 the forest maximum water holding weights 231956730t.4. Returning pasturing area to forest project contributes to increase forest economic value. The two methods of calculating economic value of forest maximum water holding shows that from the year 2000 to 2004, the forest maximum water holding values 63789.7 thousand Yuan and 1324471.5 Yuan respectively in the two ways.5. All the indexes get little change in the first two years, from the year 2002 to 2003, all the indexes changes a lot. After the year 2004, all the indexes reach to a steady state.