Before harnessing the Sanmeng River watershed is characterized withvegetation damaged

a large amount of soil and water lost

the farmlandlost of water

soil and fertility

tillage layer becoming thinner and thinner

productivity gone down and lower ability to fight against drought.Also

river bed is raised and deposited greatly

large area of lower lyingfield created

which reduce the benefits. The harness measures adopted are as these: 1、to regulate the structure and distrbution of forestry

to expand vegetation; 2、to persist in the steep land returned from tillage to forest and husbandry

and reclamation not to be permitted; 3、to develop economic forest for the increase of commodity products based on the superiority of the lower hill or gentle slope. The result is thatthe cover rate of forest is increased from 38% to 56.5%

the cubic meter amount stored of the standing trees from 18

000m3 to 59

00 m3

being2.3 tims in increase

the net income from them is 6.21 million yuan

andaccumulated ratio of output to input 17.22.