Evaluation On The Ecological Service Of Urban Forest Ecosystem In Changzhou

The forest as the main body of the terrestrial ecosystem,is an important renewable resources and energy in the biosphere.The forest is an important regulator to maintain the ecological balance,and provided a lot of ecosystem services for human(Huan Manman,2001).In the process of social development,people's understanding of forest ecosystems is also changing.The forest water conservation,soil conservation,carbon fixation and oxygen release,air purification,biodiversity conservation,noise reduction and service function is gradually recognized by people.People began to realize the service function of the forest ecosystem plays an important role irreplaceable for human survival and life,material interests and environmental interests.This study selected Changzhou city as the research object,according to the?Evaluation standard of forest ecosystem services?(LY/T 1721-2008),combined with the positioning of the service function of city forest and ecological system,to construct the forest ecological service function evaluation index system.Mainly to the forest ecological system of Changzhou city water conservation,carbon fixation and oxygen release,air purification,biodiversity protection,to reduce noise and service function of forest recreation value evaluation index,calculated the service quality and value,and analyses its dynamic changes and causes.The results show that:(1)Urban forest water conservation,carbon fixation and oxygen release,air purification,biodiversity conservation,noise reduction and service function value in 2014-2016 have continued to increase,but increase the amount and increase speed is not obvious.(2)The total value of ecosystem services in Changzhou was up to 4075240.97 million yuan/a in 2016.The value of water conservation is 2664060.87 million yuan/a,fixing carbon and releasing oxygen value is 35087.61 million yuan/a,the value of clean air volume is 63863.11 million yuan/a,the value of biodiversity protection is 81375.01 million yuan/a,reduce the amount of noise value is 630634.55 million yuan/a value of forest recreation is 600219.82 million yuan/a.(3)Changzhou forest ecosystem services function index of physical quantity is 43596.65 tons of water conservation/a respectively,fixed CO2 53.66 million tons/a,release of O2 42.14 million tons of/a,absorption of SO2 9.60 million tons/a,341.78 tons of dust/a,total amount for 44043.83 million tons/a in 2016.