Economic value assessment of vegetation ecological service function in the hillygully area of Loess Plateau A case study in north Yuzhong semiarid mountains

Based on the analysis and utilization of current research results, the vegetation ecological service value and its change in north Yuzhong semiarid mountains were estimated according to factor table of China ecological value of ecosystem services. The results showed that the vegetation ecological service value were 15.98107Yuan/a in 2003, and 13.32107Yuan/a in l993, and 7.69107Yuan/a in l983, increased 8.28107Yuan/a from 1983 to 2003, 108 percent. The forest and natural grassland vegetation offered the main ecosystem service function, mostly affected by soil formation and protection and biodiversity maintenance function.