Temporal and spatial changes in ecosystem service values in the northern sanjiang plain

The northern Sanjiang Plain is an important commodity grain production base,also distributed by the national nature reserves of Qixinghe wetlands,Sanjiang wetlands and Honghe wetlands,which have been included in the list of important international wetlands.In the regional economy and ecology,the stability and health of local ecosystems are closely related to food security and developmental sustainability.Thus,it is desirable to know the capacity of ecosystem services in this area.This paper used the two cities and five counties in the northern Sanjiang Plain for a case study,including Youyi County,Raohe County,Baoqing County,Fuyuan County,Fujin City,Tongjiang City,and Suibin County.Based on RS,GIS,and land use data,the ecosystem service values during 1954-2009 were calculated to reflect the temporal and spatial variations according to multiple assessment models.The results showed that( 1) the area of different land use types was drastically changed:farmland increased fastest at 1.08% per year and wetlands fol