Evaluation On The Value Of Mangrove Ecosystem Services At Beilun Estuary Of Guangxi

With the construction of ecological civilization,people begin to pay attention to the value of the ecosystem.As mangrove ecosystem,one of the four most productive Marine natural ecosystems in the world,its value assessment can effectively promote economic,social and ecological unity of mangrove ecosystem.On existing data and predecessors' research results based on the analysis and sorting,apply the theory of ecological economics and environmental resource value assessment,statistical theory and methods to construct mangrove ecosystem service value assessment index system,select Bei Lun estuary mangrove nature reserve of Guangxi as the objects of mangrove ecosystem assessment.Through field exploration mangrove ecosystem in the study area on distribution characteristics,and choose the typical disadvantage of mangrove,Bruguiera gymnorrhiza,Kandelia candel,Aegiceras corniculatum,Avicennia marinaas as research object,according to the distribution characteristics of sample plots setting,each plant communities choose three representative area as plants(root,stem and leaf)and soil sample collected(10 m x 10 m),do investigation on each wood base diameter,tree height and canopy density within sample area at the same time.Combined with the background data,remote sensing data,social economic data and questionnaire,on the basis of experimental analysis,and mangrove ecosystem services value evaluation index system,the mangrove ecosystem service value assessment in the studied area,and analyze the results.The main conclusions of this paper are as follows:Mangrove ecosystem service function in the system analysis of this study,on the basis of construction of mangrove ecosystem service value assessment index system,with Bei Lun estuary mangrove reserve as the research object,to evaluate its value and it is concluded that the ecosystem service function value and the value,the full text the following main conclusions:(1)The evaluation index system of service value of mangrove ecosystem was constructed.There are three first class targets: direct economic value,indirect economic value,ecological and environmental value,10 secondary indicators and 21 tertiary indicators.The index system is distinct and independent,and the indexconcept is clear which can better reflect the characteristics of the mangrove ecosystem itself.(2)The mangrove ecosystem service value in the study area is about 29978.72 million yuan,the mangrove value per unit area is about 230600 yuan/ha,its area accounts for only 0.43% of the Fangcheng District and Dongxing city area,but the value of the 1.30% of GDP.It is indicated that this reserve provides a high ecosystem service function value for human production activities,and provides economic basis for future protection and management of the reserve.(3)The value composition of the mangrove ecosystem in beilun estuary is mainly based on ecological and environmental value.Among them,direct economic value is9066.57 million yuan,indirect economic value is 1503.59 million yuan,the ecological and environmental value is 19408.56 million yuan,direct economic value is 12.91 times of the indirect economic value.(4)Among sub-index,the biggest contribution is the habitat value and fishery product value and then release oxygen value,the three value accounts for 75.53% of total value,it has to do with the internal structure of mangrove ecosystem characteristics,geographic location,etc.The smallest contribution is the absorption of fluoride and the value of nitrogen oxide.In addition,the negative value of methane emissions accounted for 23.99% of the value of the purification,methane emissions produced negative influence the size of the mangrove ecosystem purification function value is one of the factors,when evaluating mangrove ecosystem service value,produced methane emissions should be paid great attention to the negative effects.(5)In addition,the disadvantage of mangrove four community collected samples of the experimental analysis results show that the soil organic carbon content of sample average is about 14.36 g/kg,different content of community,which fall in tomato community the highest,lowest disadvantage of community,The total biomass of each community is between 9.18 and 44.9t/m2,and the average biomass of the community is 27.87t/m2,and the average solid carbon amount of the community is12.41t/ m2.The soil and plant roots,leaves and stems of different mangrove plants have different accumulation capacities of N,P,K and heavy metals,and there are also differences in carbon fixation capacity.In soil and plant organs,Zn content is the highest,Cd content is the lowest,and the accumulation of nutrient elements is N >K > P;The N,P,K and heavy metal elements absorbed by the plant are mainly concentrated in the roots and stems.This study discusses the establishment of the evaluation index system and calculation method of the service value of mangrove ecosystem services,which provides a reference for the quantification of mangrove resources.The results for Beilun estuary national nature reserve of mangrove resources quantitative reference value,to deepen understanding of mangrove resources value and scientific basis was provided for realizing the sustainable development of the Beilun gulf.