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The joint governance of transboundary river pollution is an important means to resolve disputes between upstream and downstream, to achieve regional coordinated development and water environment governance. In this paper, dissolved oxygen, chemical oxygen demand and ammonia nitrogen are used to measure water quality. Regarding the joint governance of transboundary water pollution as a quasi-natural experiment, this paper employs a difference-in-differences model of causal judgment to assess the effect of the policy on transboundary water quality based on the water quality monitoring week data from 2004 to 2016 in China. The results show that compared with non-trans-provincial rivers, the joint governance of water pollution at the provincial boundary could significantly promote the rise of dissolved oxygen, while reducing the chemical oxygen demand and ammonia nitrogen emissions. Additionally, the long-term dynamics based on the dynamic trend suggests that the implementation of this policy has fluctuations in the improvement of dissolved oxygen, but has a strong continuous effect on the reduction of chemical oxygen demand and ammonia nitrogen. These results stand up to robustness tests. Moreover, the green promotion pressure of officials and stakeholder supervision are important influence mechanisms of transboundary joint pollution control on improving transboundary water quality. An important implication is to provide a long-term way for collaborative water pollution control and solving transboundary water pollution disputes.

The economic development of China has transformed from factor-driven type to innovation-driven type, and the upgrading of industrial structure is very important. In this paper, in order to explore the path of the coupling effect of modern service industry and agriculture, based on previous research and practical experience, we select 14 indicators, and then use the theory of disipative structure, coupling degree and coupling coordination degree to measure the coupling phase of modern service industry and agriculture. On this basis, we use the spiilover effect for the empirical testing of influence of modern service industry on agricultural development. The study shows that modern service industry and agriculture in our country are at the medium coupling, and in the early stage of development. The spiilover effects of China's modern service industry on China's economic development and agricultural progress are significant. Finally, the policy recommendations are put forward from tourism, logistics and so on to promote the coupling of modern service industry and agriculture and provide a reference for promoting the coupling level of China's modern service industry and agriculture. [ABSTRACT FROM AUTHOR]