Research On Ecological And Hydrological Functions Of Yunnan Pine Forests

Yunnan pine is one of the main local afforestation tree species in Yunnan Province, which plays a very important role on the water conservation, hydrological effect of soil, improve the ecological environment. In recent years,Yunnan pine forest area is reducing due to the anthropogenic stress, causing increasingly serious water loss and soil erosion. This article choose the central Yunnan Province as the study area and evaluate and analysis the ecological andhydrologica function of different age Yunnan pine forest from the aspects of litter layer, soil layer and the transpiration water consumption. For the update of protecting natural forests and selecting suitable tree species, in order to increase conservation function of soil and water, to ensure the sustainable utilization of water resources in central Yunnan area.The characteristics of hydrological of four typeical Yunnan pine forest in central Yunnan were studied in comparison with Eucalyptus forest, Acaciadealbata Linn and Chinese fir forest,the hydrological factors from three aspects like litter layer,soil layer and plant transpiration water consumption wereobservation and analysis,explore the ecological and hydrological functions of different age of Yunnan pine forest, the method of analytic hierarchy process(AHP) was applied to establish the ecological and hydrological functions were employed to give evaluation index system, based on the entropy value method for each determine weights of evaluation indicators, using comprehensive assessment method to evaluate ecological and hydrological functions of Yunnan pine forests.Research results are as follows: Among the different ages of Yunnan pine fores in central Yunnan Province, the nearly mature Yunnan pine forest ecological and hydrological functions are stronger than mature Yunnan pine forest, the middle-agedYunnan pine forest is weaker, young stand Yunnan pine forest is the worst. The ecological and hydrological functions among the 7 kinds forest in central Yunnan Province, Acaciadealbata Linn is best, nearly mature Yunnan pine forest, mature Yunnan pine forest, middle-aged Yunnan pine,Chinese fir forestand young Yunnan pine forest are in the middle level, Eucalyptus trees is the worst.