Evaluation Of The Forest Eco-system Service And Its Value In Xishui National Nature Reserve

Regarded as an important base for the construction of ecological civilisation and beautiful China,Ecological system rich in precious resources with great significance for human development,is the screen protector of ecological environment security playing an important part in the natural environment,water and soil conservation,climate adaption,and perfection of biological gene pool and so on.The ecosystem in the conservation area not only remains intact,typical and stable,but it also provides human beings with more extensive and wider services.Forestry ecosystem as the largest ecosystem in continent boasts its wider distribution in the conservation area,which can’t be underestimated,but plays a massively invisible ecological role.The purpose of this paper is to estimate the service value of Xishui National Nature Reserve.According to the theoretical aspects of forestry ecosystem value assessment and accounting methods both nationwide and worldwide,the database of scientific research report by the Reserve team and the National Nature Reserve Administration,the Criteria for Forest Ecosystem Service Evaluation issued by The State Administration for Market Regulation and Standardisation Administration in 2020,the author of this paper is to build an accounting system to study the value of forest ecosystem in the conservation area through both direct and indirect mechanisms.The results proved that:（1）The total forest ecosystem service value of Xishui National Nature Reserve was 6,634309,008 million yuan/a.According to the value structure of forest ecosystem services in Xishui National Nature Reserve,the direct use value of ecosystem services in Xishui National Nature Reserve was 42,677,874 million yuan/a,and the indirect use value was 620,753,034 million yuan/a.Both direct use value and indirect use value accounted for 6.43%and 93.57%separately.（2）The sequential order of contribution value among the forest ecosystem service indicators in Xishui National Nature Reserve,is listed as follows:Water conservation value（3,19859365 yuan/a）>soil conservation value（12,860.577 yuan/a）>biodiversity value（996,658.5yuan/a）>carbon sequestration and oxygen release value（70340.247yuan/a）Ten thousand yuan/a)>forest resource value（41.38774 million yuan/a）>air purification value（100.26995 million yuan/a）>ecological tourism value（15.391 million yuan/a）.Among them,water conservation value（48.21%）,soil conservation value（18.22%）and biodiversity value（15.2%）accounted for 81.45%.（3）The author of this paper made a comparison between different structure types of tree species and dominants tree species in the conservation area when it comes to its forest ecosystem service value.Among the different structure types,the contribution value of broadleaved mixed forest was 49,675.47 million yuan/a（74.888%）.The second was conifer and broadleaf mixed forest 763,481,168 yuan/a（11.535%）and broadleaf pure forest 428,45039 yuan/a（6.473%）,accounting for 92.896%.In the unit area value,the contribution value of conifer and pure forest was 140,980 yuan/hm~2/a.Coniferous mixed forest（138,490 yuan/hm~2·a）and coniferous pure forest（137,390 yuan/hm~2·a）were the second.Among the different dominant species,the hard broad-leaved species contributed the mostly to 463815995 million yuan/a,accounting for 81.582 percent,followed by Chinese fir（Group）52141191 million yuan/a（9.171 percent）and soft broad-leaved species162.54208 million yuan/a（2.859 percent）.The contribution value of Yunnan Pine（group）was the highest（14089 yuan/hm~2·a）,followed by Cunninghamia lense（group）（136,39 yuan/hm~2·a）and Masson pine（group）（132,222 yuan/hm~2·a）.