Currently a satisfying evaluation method has not been developed for the forest ecosystem evaluation yet.Based on the Costanza's method

XIE Gao-di introduced the equivalent weight factor method.In 2008

the Institute of Forest Eco-environment and Protection

Chinese Academy of Forestry promulgated the evaluation criterion of forest ecosystem(LY/T1721-2008).Taking the riverhead forest ecosystem of Qiupu River in Chizhou City

Anhui Province as an example

the two methods were applied to calculate the service value of the forest ecosystem as approximate-ly1.13×108Yuan and 4.94×108Yuan

respectively

in 2007.This large disagreement between two numbers could be attributed to the background behind which the methods were created

different concepts

index types and included parameters.Equivalent weight factor method was created based on conditional values

reflecting objectively the people's willingness to pay(WTP).However

it maybe not theoretically precise.LY/T1721-2008assessment method emphasizes more on theoretical application and is therefore more precise and accurate.However

its results may deviate considerably from the people's willingness to pay.