Is there any information about soil erosion in soil erosion modulus, Shuozhou?

According to the measurement in Youyu County, Shanxi Province, all slopes covered with seabuckthorn can reduce surface runoff by 80%, surface water erosion by 75% and wind erosion by 85%. The dense seabuckthorn forest growing in the river valley plays an important role in flood control, siltation and bank protection. The thickness of leaves in 3-year-old Hippophae rhamnoides forest can reach about 0.5 cm, the weight of leaves per hectare can reach 10500 kg, and there are 100 ~ 140 nodules in every cubic meter of soil. Seabuckthorn has nodules and a lot of litter, which can effectively improve the soil. In addition, the juice thorn provides food and habitat for birds and animals, and Hippophae rhamnoides is also a precious tree species with economic and ecological benefits.

Ecological restoration of Youyu in Shanxi Province to create a border oasis.

forestry department of shanxi province

Youyu County, which has successfully held two consecutive eco-fitness tourism festivals, has made every tourist truly enjoy the pleasure brought by full of green. On August 20, the reporter came to interview the "four barren" land purchased by Wang, a big farmer of soil and water conservation. Hard-working Lao Wang silted up 260 mu of dams, developed more than 200 mu of orchards and planted 3000 mu of timber forests. He also built a pond and plans to develop his own "pastoral tourism" so that tourists can pick and fish. He said that the ecological restoration is so good that we will be sorry to God if we don't use it.

Youyu County belongs to the crisscross area of water erosion and wind erosion along the Great Wall, and the wind erosion is particularly serious. It used to be a barren land where "yellow sand flew from the desert to the sky". According to the calculation of local water conservancy department, the annual soil erosion modulus is 4,400 tons/km2, and the annual erosion amount reaches 63 1 10,000 tons.

In order to effectively improve the county's ecology, Youyu began to implement the ecological restoration project in 2000. Ecological restoration first requires closing hillsides and forbidding grazing. On the basis of doing a good job in the ideological work of the masses, the county combines dredging and blocking. While forbidding grazing in ecologically fragile areas, people are encouraged to plant grass and raise livestock in combination with the implementation of the project of returning farmland to forests and grasslands. In recent years, the county has completed 6.5438+0.5 million mu of farmland, and the perennial grassland area has reached 6.5438+0.7 million mu; Support farmers to buy more than 800 cows; Construction of more than 700 sets of standardized pen houses/KLOC-0; More than 24,000 local sheep in 40 villages were improved. Because the interests of the masses have been guaranteed, the ban has truly been "blocked, effective and not repeated". At the same time, in order to control the destruction of human factors, the county began to move out of the ecologically fragile area in 2002, with 2,276 families and 8,200 people; Invested more than 2 million yuan, set up more than 50,000 meters of fences in the enclosure area, and set up more than 300 enclosure signs. Relying on the construction of Yanmenguan Ecological Animal Husbandry Economic Zone and other projects, these areas have been comprehensively and comprehensively managed.

The fence protection measures combining artificial management with natural restoration have made the ecological restoration work achieve multiple benefits. The area of forest and grass vegetation has increased rapidly, and the coverage rate of forest and grass in the county has reached 47%. Soil erosion has been effectively controlled. Soil erosion modulus in the county has been reduced from 4,400 tons/km2 to 3,000 tons/km2, and the annual sediment discharge has been reduced from 63 1 10,000 tons to 310.4 million tons. The degree of control reached 49.6%, achieving the goal of "small control and great protection".