袁承程,中国农业大学副教授,博士生导师,主要从事土地调查与评价、耕地保护与利用、土地利用系统方法等研究。近年来主持国家自然科学基金2项,省部级项目10余项,并获2022年度科技智库青年人才计划支持。目前,在Land Use Policy、Journal of Environmental Management、Ecological Indicators等期刊共发表学术论文40余篇,参编专著2部,教材2部。
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Impact of the National Key Ecological Function Zone Policy on the effect of ecological protection functions
This study aims to explore the impact of the National Key Ecological Function Zone Policy on the effect of ecological protection functions in China. Based on panel data from 565 counties, districts and cities from 2000 to 2020, the difference-in-difference model was adopted to evaluate the impact and spillover mechanism of the National Key Ecological Function Zone Policy on the effect of ecological protection functions. The research results show that: 1) the National Key Ecological Function Zone Policy has a significant promoting effect on the ecological protection functions. 2) the National Key Ecological Function Zone Policy has obvious regional heterogeneous effects on the improvement of ecological protection functions, which are more significant in the Southeast Ecological Zone, key ecological zone of the Yellow River, and key ecological zones of the Yangtze River and Sichuan-Yunnan. 3) The National Key Ecological Function Zone Policy has a positive spatial spillover effect on the improvement of ecological protection functions. Therefore, the guiding role of the National Key Ecological Function Zone Policy in improving the effect of ecological protection functions should be fully leveraged, the long-term effectiveness and precision of the policy should be deepened, differentiated development paths for key ecological function zones should be advanced according to local conditions, regional coordination mechanisms should be promoted, and the quality of the ecosystem should be further improved.
袁承程,中国农业大学副教授,博士生导师,主要从事土地调查与评价、耕地保护与利用、土地利用系统方法等研究。近年来主持国家自然科学基金2项,省部级项目10余项,并获2022年度科技智库青年人才计划支持。目前,在Land Use Policy、Journal of Environmental Management、Ecological Indicators等期刊共发表学术论文40余篇,参编专著2部,教材2部。
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袁承程,中国农业大学副教授,博士生导师,主要从事土地调查与评价、耕地保护与利用、土地利用系统方法等研究。近年来主持国家自然科学基金2项,省部级项目10余项,并获2022年度科技智库青年人才计划支持。目前,在Land Use Policy、Journal of Environmental Management、Ecological Indicators等期刊共发表学术论文40余篇,参编专著2部,教材2部。
2)核心解释变量。核心解释变量是国家重点生态功能区政策的虚拟变量。即DID it =Treat i ×Post it。其中Treat i 与Post it 分别为个体虚拟变量和时间虚拟变量,Treat i 用于识别县是否被列为国家重点生态功能区,若县属于国家重点生态功能区,则Treat it 取1,反之取0。Post it 为时间虚拟变量,用于识别政策是否已经开始执行,若被确定为国家重点生态功能区的城市政策开始实行,则Post it 取1,反之取0。
此外,本研究也开展了其他稳健性检验。第一,缩尾处理,鉴于极端值可能影响—模型估计的稳健性和准确性,对连续变量的上下5%分位数实施了缩尾处理以保证模型结果的可靠性;第二,引入省份固定效应,考虑到不同省份影响经济水平、地方政策等有所差异,尽管本研究已经控制了县域层面的固定效应,仍可能受所属不同省份影响产生差异,由此加入省份虚拟变量进行稳健性检验;第三,改变标准误,在本研究原来普通标准误的基础上,更换为稳健标准误和县域聚类标准误。结果表明,无论是缩尾处理,还是引入省份固定效应和改变标准误,DID it 的系数仍然显著为正,进一步验证了结果稳健。
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