In order to predict and evaluate the ecological service values under different land use types in Yanchi County

Ningxia Hui Autonomous Region

a research on the changes of land uses and ecological service values was conducted for six types of land uses(farmland

forestland

grassland

saline land

desert and other lands).Results showed that from 1999to 2004

the amount of transferred grassland and farmland was greater than other land uses

with farmland being mainly transferred to grassland.From 2004to 2010

the transferred farmland and grassland were still more than other land uses

and the conversion between grassland and farmland still occurred in this period

with a small portion of grassland being turned into desert.In these years

the total ecological service value of 2004was the highest and the overall trend first increased and then decreased.In the first class service

the values for regulating services and support services were greater than others

but the annual changes were insignificant.Soil conservation

biodiversity conservation and climate regulation dominated in the second class service.Generally

the contribution from forestland and grassland was the largest in these years.