Study On Affection Of Water Resources Protection Forest To Water Quality Of Miyun Reservoir In Beijing, China

The content of this thesis was supplying with the key problem of Science and Technology to tackle of The 15th : Research and demonstrate of constructive technique on the important type of water resources protection in the headwater of citied (2001BA510B02-02). The mostly ways and means comprise survey of field investigative and the examination of artificial stimulant rainfall. Evaluation methods include general index, blur-mathematics and grey incidence. Understand on the improvement of the forestry ecosystem to water quality. Consequently, which can offer theoretical sustain to the construction and management of Forestry for Water Resources Protection.Main research results:I The affection of Water Resources Protection Forest to rainResult indicate that the total rainfall is 545mm of the research period in2002 and 2003, which reduce 50%, compare with well-balanced years in the testing station of Beizhuang village in the Miyun county. Rain penetrate through forest, the concentration of Sal, NH4+, NO3- increase in evidence. The concentration of DO, pH and ORP decrease comparing with rain outside forest.II The affection of Water Resources Protection Forest to runoffResults of the surface runoff indicate that Water Resources Protection Forest can improve the water quality. Forest cover rate of Tumenzhonggou is 35.7%. Forest cover rate of Tumenxigou is 93.8%. Water quality of Tumenzhonggou is better than of Tumenxigou.The effect in little intensity of rainfall is clear.Water Resources Protection Forest can buffer the varieties of pH, Sal, Tur and NH4+. But the change of water quality in no forest area always reduce clipping by the rainfall, no buffer, which easy run out nutrient.The groundwater results indicate that Water Resources Protection Forest improve water quality. Forest cover of sampling point 3 is the most high, whose water quality is better than the other.III Infection evaluation on Water Resources Protection Forest to water qualityWater quality and cover rate of forest are positive relativity, the same time jamming is relativity. Water quality standard of Weijiayu river, Chenjiagou river and guojiagou river exceed I degree of national surface water quality standard, whose forest cover rate exceed 90% and jamming is light. The water quality of Beihuodao river and Bailongtanriver reach II degree, whose forestry rate are 48.2% and 46.5%, and jamming is more serious. Water quality standard of Lingwushan river, Guojiagou river exceed III degree, whose forestry rate are 57.6% and 35.7%, and jamming is seriously.The water quality of Xinqiao and Damaguan bayou reach I degree of national surface water quality standard. The water quality of east on reservoir reach II degree. The water quality of west and center on Miyun reservoir reach Illdegree.