Carbon Source and Sink of Farmland Ecosystem in Wu’ an

LUO Guangfang; ZHANG Jianjun?; RAO Yongheng; HUANG Hui

Abstract：In order to explore the effective ways to decrease carbon emissions of farmland ecosystem,and promote the sustainable development of agriculture,this paper calculated the amount of carbon absorption and carbon emission respectively,and the spatial-temporal variations and impact factors of carbon absorp-tion and emission were analyzed. The results showed that the total amount of carbon emission appeared a relatively stable state,and the fertilizer production and use was the main source;the total amount of carbon absorption decreased first and then increased in the farmland ecosystem,the main reasons were the adjust-ments of farm inputs and agricultural structure. The correlation analysis results showed that carbon absorp-tion amount was significantly positively correlated with the crop yield,main crop types,effective irrigation area and use of agricultural machinery;positive correlations were observed between carbon emission amount and use of fertilizer,the use of agricultural machinery,effective irrigation area and crop planting area. Based on the above analysis,some policy suggestions were put forward to decrease the greenhouse gas emission and promote the low-carbon agriculture development, such as adjusting the crop planting structure,improving the conditions of fertilizer,adjusting the cultivation mode,the system of irrigation and straw waste disposal ways.