Study On Evaluating The Main Value Of Forest Ecosystems In The Dagangshan Mountain In Jiangxi Province

Forest ecosystem services are the bases of the human's survival and modern civilization.Science and technology can affect the ecosystem services,but can't substitute the natural ecosystem services. Human beings' unreasonable use and interferences have led to the increasing destruction of the ecological environment,which in return greatly damaged the ecosystem services.As the further study of the sustainable development research in depth,it was discovered that the maintenance and conservation of ecosystem services are the basements to achieve sustainable development.Therefore,the analysis and evaluation of forest ecosystem services have an important role in promoting the value of the ecological environment,forest health and other related studies.In this paper,the author takes the Jiangxi DaGang Mountain National Forest Ecosystem Research Station(referred to as DaGang Mountain Forest Ecosystem Station) as an example,adopting the long-term,continuous observation to get the large number of basic data,and integrating the related knowledge of ecology,ecological economics and environmental statistics to make the case analysis of the evaluation methods in the three forest value of ecosystem services:water conservation,conservation of soil and the accumulation of nutrients.The main results are as follows:1,There are some improvements of the evaluation methods to the three service functions of the forest ecosystems-conserve water sources,conservation of soil and nutrient accumulation-on the basis of assessment norms.In this study,the author believes that it must be take the effective supply of ecological functions into the consideration when concerning the assessment of the functions of the forest ecosystem services.That is the mode and degree of the usage of the functions.And in this way,it makes the evaluation methods more reasonable and feasible.2,In this study,it adopts the reclaimed water to calculate the value of water conservation of forest ecosystems in Dagang Mountain,Jiangxi Province;and using the contribution of forest timber to calculate the solid soil and fertilizer value of the soil conservation function;and discounting the forest accumulation nutrients N,P,K value(because only the decay of wood could reflect the effective value N,P,K).It makes the valuation methods more reasonable and feasible though some improvements.3,It makes a comparison and evaluation of the value obtained from the pre- and after- the improvement of these three kinds of service functions in forest ecosystem conserve water sources, conservation of soil and nutrient accumulation.According to the assessment-norms method,the result of the values of the three functions- conserve water sources,conservation of soil and nutrient accumulation in Dagang Mountain- are correspondently 25344.29 million per year,714.10million per year and 30688.95 million per year;and after improvements,these three service values are:3080.52 million per year,278.99 million per year and 10766.39 yuan per year.The errors of these two methods are as follows:22263.77 million yuan per year,435.11 million per year and 19922.56 million per year.