Abstract: Land readjustment could change the structure of land use,and destroy the balance of ecosystem carbon cycle.In the period and after a definite time of land readjustment,the carbon storage in agricultural ecosystem would be decreased,making the ecosystem turn from carbon sink to carbon source.Based on the estimation of the ecosystem carbon storage in Cuiyuan village of Jingmen City,and with a linear programming model,this paper approached the optimal structure of land use for the land readjustment in the study area,which could compensate the ecosystem carbon storage loss.The results showed that an increment of cultivated area to 11.96% of the total area should be the maximization to meet the needs of building road system,irrigation system,and housing estate.To make the balance of ecosystem carbon cycle,artificial forest area should be increased by 3.90 hm².

Key words: Solidago canadensis, Allelopathic effects, Extract, Bioassay