Evaluation On The Typical Plantation Ecosystem Service Function In Yongshou County

In order to clarify the ecosystem service function value of plantation in Yongshou County,and provide scientific suggestions for the management of plantation in Yongshou county.In this study,five typical plantations in Yongshou County,located in the Loess Plateau of Weibei,were selected as the research objects,and the hydrological effects,soil physical and chemical properties,biomass and productivity,plant physical and chemical properties,and biodiversity were studied by using the spatial-temporal substitution method.Six kinds of ecosystem services of the artificial forests were calculated according to the"forest ecosystem service function evaluation standard"The physical quantity and value of functions?water conservation,soil conservation,carbon fixation and oxygen release,nutrient accumulation by trees,biodiversity protection,and purification of atmospheric environment?were analyzed.The change trend of ecosystem service function of Robinia pseudoacacia Plantation with forest age was clarified,and the differences of ecosystem service functions of different plantations were compared.The main conclusions are as follows:?1?For different age groups of Robinia pseudoacacia plantations,the value of ecosystem services per unit area was mature forest>over mature forest>near mature forest>middle aged forest>young forest,ranging from 35935.8 to 45202.3yuan·hm^-2·a^-1.With the increase of forest age,the functional value of water conservation and soil conservation gradually increased with the increase of forest age.The functional value of carbon fixation,oxygen release and nutrient accumulation first increased,reached the highest value in the middle-aged forest period,and then decreased gradually.The biodiversity protection value showed a fluctuating upward trend,with the lowest in the middle-aged forest and the highest in the mature forest period.The value of air purification function increased first and then decreased,and reached the highest value in the near mature forest period.?2?For five different types of plantations with the same growth years,the value of ecosystem services per unit area was as follows:Robinia pseudoacacia+Pinus tabuliformis mixed forest>Robinia pseudoacacia+Populus davidiana mixed forest>Pinus tabuliformis forest>Robinia pseudoacacia forest>Platycladus orientalis forest,ranging from 35970.9to 50660.4 yuan·hm^-2·a^-1.The water conservation function value of Pinus tabulaeformis forest was the highest,and that of Robinia pseudoacacia+Populus davidiana mixed forest was the lowest.The soil conservation function value of Robinia pseudoacacia+Pinus tabuliformis mixed forest was the highest,and Platycladus orientalis was the lowest.The value of carbon fixation and oxygen release and the value of accumulated nutrients were the highest in Robinia pseudoacacia+Populus davidiana mixed forest,and the lowest were in the Platycladus orientalis forest.The value of biodiversity protection was the highest in the Platycladus orientalis forest,and the lowest were in the Robinia pseudoacacia+Populus davidiana mixed forest.?3?The total value of ecosystem services of typical plantations in Yongshou county is109272.1 million yuan·hm^-2·a^-1,and the value per unit area is 40210 yuan·hm^-2·a^-1.The six service functions of typical plantation in Yongshou county are as follows:water conservation>carbon fixation and oxygen release>biodiversity protection>soil conservation>nutrient accumulation>atmospheric purification.According to different forest types,the total value of ecosystem service function was as follows:Robinia pseudoacacia forest>Pinus tabulaeformis forest>Platycladus orientalis forest>Robinia pseudoacacia-Pinus tabulaeformis mixed forest>Robinia pseudoacacia-Populus davidiana mixed forest.?4?Redundancy analysis showed that the ecosystem services were greatly affected by vegetation coverage,soil organic matter content,litter thickness and slope gradient.In the work of forest management,from the perspective of forest ecosystem service function,we should pay more attention to the tending of different stands according to the actual demand of ecosystem service function.On the premise of water conservation and soil and water conservation,reasonable control of stand density,introduction of low water consumption tree species or drought tolerant shrubs and native herbs can improve the overall benefits.