| The forest is the lung of the earth and the main body of the terrestrial ecosystem.The noncommercial forest is built to give full play to the service functions of the forest ecosystem,provide a good ecological environment support for the sustainable development of the economy and society,and meet the people’s beautiful ecological needs.In order to timely grasp the quality and ecological status of non-commercial forest and understand the effectiveness of non-commercial forest construction,this study evaluates and calculates the quality and ecological service functions of non-commercial forest in Tiantai County.Based on the data of forest management inventory and quadrat survey data of Tiantai County in 2017,this study calculated the biomass of each subcompartment by using the key noncommercial forest model of Zhejiang province,so as to count the biomass of non-commercial forest in the whole county.Based on the calculation of subcompartment biomass,the parameters of productivity estimation are calculated by using the 3-stage reset sample plot and the reset sample wood data.Finally,the parameters are substituted into the subcompartment biomass,and the productivity of noncommercial forest of the whole county is calculated by dividing the forest type,stand type and age group.Biomass and productivity are the basis of ecological benefit estimate calculation,after the completion of biomass and productivity estimation,the non-commercial forest ecosystem service function evaluation index system of Tiantai County is based on the evaluation criteria and methods in the Forest Ecosystem Service Function Assessment Specification(LY/T1721-2008),estimating the physical quantity and value of the ecological service function of the non-commercial forest in Tiantai County.At the end of the study,the coupling level of non-commercial forests in Tiantai County to meet ecological needs is evaluated.The results show that the total biomass accumulated in the non-commercial forest in Tiantai County is about 5,272,700 tons,and the biomass per unit area is about 91.41 tons/ha.In 2017,the annual net productivity of non-commercial forests in tiantai county is about 361,400 tons,and the annual net productivity per unit area is about 6.26 tons/ha.In 2017,the total annual benefit of the ecological service function of Tiantai County’s non-commercial forest was 4.97 billion yuan,of which 17,598.71 million tons of water are conserved,bring the ecological benefit value of 1.899 billion yuan.The amount of solid soil is 1.8985 million cubic meters,the total amount of fertilizer protection is 94,400 tons,and the value of soil and fertilizer is 410 million yuan.The carbon fixation amount of vegetation is 160,700 tons and oxygen release amount is 430,100 tons.The value of carbon fixation and oxygen release is 765 million yuan.The total amount of nutrients accumulated by trees is 0.6 million tons,with a total value of 0.76 billion yuan;the amount of sulfur dioxide absorbed is 0.72 million tons,and the amount of dust retention is 1,470,300 tons,giving play to the total value of purified atmospheric environment is 351 million yuan.The biodiversity conservation is 385 million yuan;the forest protection value is 0.43 billion yuan;and the forest recreation value is 1.040 billion yuan.The results of ecological demand coupling level of non-commercial forests show that the elevation and slope of commercial forests are both smaller than that of non-commercial forests,indicating that there are more non-commercial forests in places with high altitude and more commercial forests in places with low altitude.The slope local non-commercial forests are more distributed,and the local commercial forests with gentle slopes are more distributed,indicating that the distribution of non-commercial forests in Tiantai County is basically consistent with the provisions in the basis of non-commercial forest.This study carried out scientific estimation of biomass,productivity and ecological benefits for all non-commercial forest in Tiantai County,and conducted research on ecological demand and spatial coupling level.This is the first time in the past 20 years that non-commercial forest construction work has been carried out in Tiantai County.It is a scientific assessment and summary of the staged achievements of the construction of non-commercial forest in Tiantai County,and can provide reference for the construction of non-commercial forests in Tiantai County.At the same time,the use of subcompartment data to calculate forest biomass and productivity,and the introduction of adjustment coefficient k in the calculation of ecological benefits,can make the estimation results more accurate.Then the productivity can be calculated by substituting the parameters into the corresponding biomass data of subcompartments. |
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