Empirical study on comprehensive benefit of recovery and construction projects of grassland——A case study of Gannan Tibet Municipality

Based on the theoretical frame and evaluation index system on assessment of comprehensive benefit of grassland construction engineering project, a case study was conduced in Gannan Tibet Municipality, including Maqu County, Luqu County, Xiahe County and Hezuo City. Gannan Tibet Municipality is one of districts that the recovery and construction projects of Gansu natural grassland were implemented. In this study, 51 assessment indexes were selected, according to the actual conditions of Gannan. Besides, a hierarchy structure and comprehensive assessment model was designed. The total weight of every index was calculated based on the analytic hierarchy process (AHP). The results showed that, the ecological, economic and social benefits were significantly increased with the conducing of projects, and which were increased by 6.135%, 5.433% and 14.042%, respectively. Compared with the corresponding values, which were before the implementation of recovery and construction projects, the landscape benefit was maintained, the starts quo and the environmental benefit decreased from 0.105 to 0.103.