Decoupling mechanism of heavy metal water pollutant discharge in the Yellow River Basin

Abstract

The decoupling of economic growth and heavy metal water pollution discharge in the Yellow River Basin is conducive to the coordinated promotion of large-scale governance. Although there are abundant researches on the decoupling elasticity of resource and environment consumption and its driving effect, there are few microscopic analyses on the driving effect. In view of this, Tapio and LMDI model for the Yellow River basin in 2011-2017 economic growth and heavy metal water pollutants decoupling state and driving effect, explain the decoupling mechanism of heavy metal discharge in the Yellow River basin. The results show that : (1) Although there is a strong decoupling state at the basin level (except 2014-2015), the decoupling situation in the upstream region is still very unstable. (2) The sewage discharge intensity effect is the dominant effect driving the discharge decoupling of heavy metal water pollutants in the basin; The income effect of industrialization is the dominant effect of restraining the decoupling of heavy metal water pollutant discharge.