FDI与区域CO2排放关系研究——基于知识产权保护的动态门槛效应

外国直接投资（FDI）促进中国经济发展的同时，也带来了环境污染。为了分析FDI对CO2 排放的非线性影响，本文基于2005—2016 年省际面板数据，将知识产权保护作为门槛变量，利用GMM方法构建了FDI对不同地区CO2排放影响的非线性动态门槛效应模型。本文的研究结论表明：东北地区FDI对CO2排放具有双门槛效应，知识产权保护最优区间为(8.8939，,10.4714)，华北地区不存在门槛效应。东部沿海、东南沿海、黄河中游、长江中游、西北和西南六个区域存在单门槛效应。其中黄河中游地区，知识产权保护水平高于门槛值为最优区间，而其他五个区域知识产权保护低于门槛值为降低碳排放的最优区间。各地区应合理确定知识产权保护水平和外国直接投资负面清单，并通过金融优惠、构建技术共享平台等方式降低碳排放水平。

The relationship between FDI and regional CO2 emission -- dynamic threshold effect based on intellectual property protection

The inflow of foreign direct investment not only promotes China''s economic development, but also brings environmental pollution. In order to analyze the nonlinear effect of FDI on CO2 emission, this study takes intellectual property protection as the threshold variable and uses the GMM method to construct a nonlinear dynamic threshold effect model for the impact of FDI on CO2 emissions in different regions on the basis of the inter-provincial panel data from 2005 to 2016. The research results show that FDI has a double threshold effect on CO2 emission in northeast China, and the optimal interval for intellectual property protection is (8.8939,10.4714), while there is no threshold effect in north China. The single threshold effect exists in the east coast, southeast coast, middle reaches of Yellow River, middle reaches of Yangtze river, northwest and southwest. In the middle reaches of the Yellow River, the optimal interval for the intellectual property protection level is higher than the threshold value, while the optimal interval for the intellectual property protection level is lower than the threshold value in the other five regions. All regions should reasonably determine the level of intellectual property protection and adjust the structure of investment , and reduce carbon emissions through financial incentives and technology sharing platforms.