农地杨树化的责任与治理路径

Consequences fo Poplar Overspread on Agricultural Land and Its Treatment

近年来,全国各地尤其是北方地区农地杨树化现象比较普遍。基于对鲁南地区的调研,建立"领导-跟随者"模型,发现产生农地杨树化现象的传导机制为:少数富裕农民为追求自身收益最大化而在各个兼业上优化劳动时间配置而率先种植杨树,杨树种植所产生的外部性对邻地农民造成损害,邻地农民也被迫在自家的良田上种植杨树,由此导致了杨树泛滥成灾。杨树化有一定的碳汇作用,但粮食耕种面积的减少不利于我国的粮食安全。为此,应采取相应的治理措施,解决外部性导致的隐性侵权问题,鼓励少数富裕农民将良田歇耕,完善土地承包经营权流转制度。

In recent years,throughout the country especially in North-China poplar is widely planted in agricultural land. Basing on the research on the south region of shandong province,we establish a ＂leader-follower＂ model,that analyze the causes of poplar planting：a few wealthy farmers who works on various part-time jobs firstly plant poplar trees to maximize their own benefits,which bring about negative externalities on the neighborhood agricultur-al land. Then the adjacent land farmers are forced to plant poplar in their own fertile land,which lead to poplar overspread. Poplar has a certain role for carbon sinks,but the reduction in grain acreage affects the nation＇s food security.Therefore,we should take appropriate remedial measures to solve the underlying tort of externalities,and en-courage few wealthy famer to stop growing,and to perfect the transfer system of land contractual right.