Evaluation of the farmland shelterbelt ecosystem service is of vital importance due to its practical application in regional economical development and ecological environment protection.In this case

farmland service function value of He′nan Province from 2001to 2005was evaluated by applying methods including market price

opportunity cost

and shadow price.Results showed that the total ecological service function value of the farmland in 2001and 2005were 1.04×1010 and 1.46×1010 yuan

respectively. The ecological service function index values followed such a decreasing order:soil protection>crops yield increment>biodi-versity protection>CO2fixation and O2release>air purification. The increment of total ecological servic was 1.53×109 yuan each year. The service of soil conservation increment value was the largest(9.94×108 yuan)

followed by soil protection(3.01×108 yuan)

crops yield increment(1.25×108 yuan)

biodiversity protection(7.00×107 yuan)

CO2 fixation and O2release(3.77×107 yuan)

and air purification(7.79×105 yuan). Due to the fact that the ecological service function value of the shelterbelt is tremendous

it is sugges-ted that ecological service market compensation mechanisms and perfected ecological service function valuated should be established as early as possible

so as to extend the farmland from an ecological style to an ecologi-cal and economical style.