Abstract: This paper applied the method of LMDI to decompose the SO2 emission density into three effects according to the production process, including energy consumption density effect, energy consumption structure effect and pollution treatment effect. This paper found that the decreasing of SO2 emission density mainly relied on the upgrade of pollution treatment technology.The second one was energy consumption density effect. The energy consumption structure was not improved from 1998 to 2009.This paper examined the relationship between environmental investment and three effects using provincial data from 2005 to 2009 based on the simultaneous equations model. Empirical results showed that the environmental investment influenced SO2 discharge positively.

Key words: environmental investment , SO2 , technique effect , LMDI , whole process treatment

摘要： 本文使用对数平均的迪氏分解法（LMDI），将二氧化硫（SO2）排放强度降低的技术效应分解为能源消费结构效应、能源消耗强度效应和污染排放处理效应。研究发现，1998—2009年，中国SO2排放强度的降低主要归功于污染排放处理效应，其次是能源消耗强度效应，能源消费结构效应的贡献最小，甚至是反向的，这说明我国能源消费结构并没有得到优化，SO2减排主要依赖于末端治理和过程控制。本文还检验了2005—2009年中国30个地区环保投资对技术效应分解结果的影响，发现环保投资对能源消耗强度效应、污染排放处理效应具有显著的正向影响，而对能源消费结构效应的作用并不显著。

关键词: 环保投资 , SO2 , 技术效应 , LMDI , 全过程治理