|Irrigation reform, yield stimulation, and risk of non-point source pollution：evidence from a pilot region in Luliang County, Yunnan
|英文关键词: reform of agricultural irrigation and water conservancy, non-point source pollution, emissions, inventory analysis, mediation effect
| Agricultural non-point source pollution caused by excessive fertilization is hindering China ' s agricultural development. Improving farmland irrigation facilities and strengthening agricultural water management are important measures to promote the sustainable development of agriculture. Thus, exploring whether the ongoing reform can simultaneously improve agricultural water management and control non-point source pollution is of great significance. However, few studies have provided a theoretical and practical basis for nonpoint source pollution control, especially from the perspective of agricultural irrigation and water conservancy reform. Based on the survey data collected in Luliang, Yunnan, we investigated the impact of the agricultural irrigation and water conservancy reform on local non-point source pollution emissions using the multiple regression model. Furthermore, we analyzed the mechanism driving the impact using the intermediary effect model. Our findings suggest that, in the villages with relatively poor irrigation systems, the reform increased the emissions of N and P non-point source pollution in the case of the absence of intervention for the externalities in agricultural activity. The increasing emissions were found to be closely related to farmers ' short-term motivation to increase the volume of agricultural production. Specifically, the reform has changed the pilot villages' crop rotation, which is captured by the re-cultivation or expansion of abandoned lands for planting spring potato, and also increases the irrigation water use and seed consumption. These changes in agricultural production arising from the reform eventually aggravate local non-point source pollution. Moreover, the yield stimulation is moderated by nonagricultural employment. Our findings provide some policy implications for areas with poor irrigation systems, the irrigation and water conservancy reform should keep pace with guiding farmers' proper application of chemical fertilizers, increasing their environmental awareness, promoting green technologies in agricultural production, and supporting agricultural socialized services.