Effect of Agricultural Development on Changes in Regional Ecosystem Service Function——Taking Northern Part of the Sanjiang Plain as the Example

Ecosystem service is an important function of the land system,and is the natural foundation construction of regional ecological civilization.Measuring the land ecosystem service function is a fundamental basis for the accurate measurement of land use efficiency and determining regional eco-compensation standards.Based on the ecosystem service evaluation method proposed by Costanza etc,this paper evaluates effects of agricultural development on ecosystem service value in the north Sanjiang Plain from 1954to 2009.The results shows that:(1)the farmland in the north Sanjiang Plain increased by 2.508 6million hectares in those 55years.The reclamation rate increased from 8.31%to 67.26%.The land use structure has changed from woodland and wetland-dominatded into farmland-dominatded;(2)the regional ecosystem service value reduced from 112.081billion Yuan in 1954to 39.077billion Yuan in 2009.The loss rate was 65.13%.Among them,the loss rate of ecosystem service value of wetlands was 90.26%,while farmland′s ecosystem service value increased 8.26times;(3)agricultural development changed structure of land ecosystem service functions;(4)due to the different land reclamation and climate characteristics in each county,there were significant differences in ecosystem service functional structure,ecosystem service value per unit area and their changing characteristics among these counties.