Research On The Ecosystem Service Value In Longmenshan Region And EML Modeling Implementation

Ecosystem services provide the basic material for human survival and development.Because of its special geographical location,Longmenshan region has an irreplaceable role in water conservation,soil and water conservation and other ecological service functions.Wenchuan Earthquake and the secondary geological disasters caused by the earthquake in 2008 caused serious damage to the lives and property of people in the earthquake area and the ecological environment,and brought huge threats to the regional ecological security.Studying on the ecosystem service function of Longmenshan region is helpful to keep abreast of the status quo of ecosystem services and the restoration of ecosystem function of Longmenshan region,and it is of great scientific significance for decision-making and management of regional ecosystem,and making scientific and reasonable ecological compensation policy after disaster,which is helpful to the construction of regional ecological civilization.In this paper,the paper study the Longmenshan's ecosystem services value from the soil conservation,water conservation,carbon sequestration,releasing oxygen function three aspects by modern technology such as remote sensing(RS),geographical information system(GIS)and ERDAS IMAGINE 2010 model in order to provide reference for regional ecological environment protection,ecological function and ecological civilization construction.The results show that:(1)From 2000 to 2010,the soil conservation value of various types of ecosystem function in Longmenshan regions steadily increasing,increasing by 39.04%;however,which showed a trend of decreasion from 2010 to 2015,decreasing by 23.71%.Overall,each period,the soil conservation function value of various types of ecosystem function in Longmenshan region present its characteristics: the value of forest ecosystem is the largest,grassland ecosystem's value secondly,the value of farmland ecosystem is the third and other characteristics of the soil conservation function value of ecosystem is the least;(2)From 2000 to 2005,the amount of water conservation of each ecosystem type and the corresponding value decreased,decreasing by 8.64%,which showed a trend of increased steadily during 2005 to 2015,increasing by 7.11%.In 2000,2005,2010 and 2015,the amount of water conservation of each ecosystem types and corresponding value in the order: forest ecosystem > farmland ecosystem > grassland ecosystem >wetland ecosystem > other ecosystem > settlement ecosystem;(3)From 2000 to 2005,the value of carbon sequestration and oxygen production of the ecological system of Longmenshan region both decreased by 4.81%,and which increased by 41.99% from 2005 to 2015.Each period(2000,2005,2010,2015),in Longmenshan regions,each types ecosystem's carbon quantity and it's value,oxygen production and it's value all show a consistent trend: forest ecosystem > grassland ecosystem > farmland ecosystem > settlement ecosystem > wetland ecosystem > other ecosystems.(4)Each period(2000,2005,2010,2015),the total value of ecosystem services in Longmenshan region are 139.398 billion yuan,143.615 billion yuan,175.477 billion yuan,and 172.651 billion yuan respectively;Each period,each kind of ecosystem service value presents common features: forest ecosystem > grassland ecosystem > farmland ecosystem > settlement ecosystem > wetland ecosystem > other ecosystems.In conclusion,the ecosystem's services value in Longmenshan region shows a steadily increasing trend from 2000 to 2010,especially from 2005 to 2010,which increased almost by 22.19%;From 2010 to 2015,the ecosystem services value in Longmenshan region shows a slight decreased(decreasing by 1.61%),but still much higher than which before Wenchuan earthquake,which indicates that the regional ecological restoration work after a disaster has made significant ecological benefits.