中文摘要：

运用福建、江西、浙江、安徽、湖南、辽宁、山东、云南8省的实地调研数据,对集体林权制度改革对森林面积和森林蓄积量的影响进行研究,在描述性统计的基础上,采用＂双重差分模型＂（DID）分析了林改对森林资源变化的净影响。实证分析结果表明,林权制度改革对于森林面积和森林蓄积的增加并不显著,长期效益远没有显现出来。

英文摘要：

Based on investigation data collected in 8 provinces covering Fujian,Jiangxi,Zhejiang,Anhui,Hunan,Liaoning,Shandong and Yunnan,this paper researches the effects of collective forest tenure reform on the forest areas and forest reserves.The paper further analyzes the net effects of the forest tenure reform on the changes of forest resources using the difference-in-differences model on the basis of the descriptive statistical analysis.Empirical results show that the increase in forest areas and forest reserves is not significant.