| In order to establish the inventory and statistics system and find out assets,Shenzhen has carried out asset inventory,statistics and evaluation of natural resources assets in Longgang District.With our living environment experiencing various ecological crises such as climate change,soil erosion and reduced biodiversity,understanding of forest ecosystems and the role of forest conservation is likely to lead to a better guarantee of human survival and sustainable development.Researchers’ work on the valuation of ecosystem services has gradually shifted the understanding of the role and value of forests from a simple pursuit of the economic value of wood,products and other products to a greater focus on ecological,social and cultural benefits,particularly in terms of water resources conservation,soil conservation,carbon fixation and oxygen release,purification of the atmosphere and other functions for the environment,as well as the social value of forest recreation.With the continuous study of ecosystem service value evaluation by domestic and foreign scholars,applies them and improves them.This thesis is based on the third national land resource survey and secondary forest survey data,combined with field actual measurement data,and searches relevant research literature on forest ecosystem service function assessment.Based on the current situation of forest ecosystems in Longgang District,the thesis refered to the "Specification for assessment of forest ecosystem services in China "(LY/T1721-2008)(The following are the "Specification")promulgated by the State Forestry Administration of the People’s Republic of China.The evaluation index system of forest ecosystem service functions was designed to evaluate the quality and value of six ecosystem services in the study area,including soil conservation,water sources conservation,purification of the atmosphere,carbon fixation and oxygen release,accumulation of nutrients and recreation.Because of the complexity of the ecosystem,it is difficult to make exact estimates,so it is necessary to choose a suitable method to assess the value of the forest ecosystem services in Longgang District.The results of the assessment can provide a more accurate basis for forestry decision-making and ecological compensation in Longgang District,and promote the construction of a green ecological civilization in the region.The results provided that:(1)The total value of the ecosystem service provided by the forest in Longgang District is 2.02 billion yuan per year.From the composition of the value of each ecosystem service of the forest ecosystem in Longgang District,the ecological value of the forest ecosystem service in Longgang District is 1.058 billion yuan per year,accounting for 52.4%of the total of the ecosystem services.The remaining part is the social value of forest ecosystem service function of 962 million yuan per year,accounting for 47.6%of the total of ecosystem services.(2)Indicators of forest ecosystem services in Longgang District,the ecological value ranked by contribution value was:soil conservation(366,822,300 yuan/a)>water sources conservation(353,794,200 yuan/a)>carbon fixation and oxygen release(199,425,800 yuan/a)>purification of the atmosphere(126,756,700 yuan/a)>accumulation of nutrients(11,357,400 yuan/a).Soil conservation is the highest value of forest ecosystem services in Longgang District,accounting for 34.7%,followed by water resources conservation,accounting for 33.4%,and the least was accumulation of nutrients.(3)According to the comparison of forest ecosystem service value of different tree species in Longgang district,the contribution value of broad-leaved mixed forests was the highest at 487,715,200 yuan/a,followed by other hard-leaved forests at 160,999,700 yuan/a and Acacia confuse at 147,075,100 yuan/a.The three accounted for 75.2%of the total. |
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