Waste classification is the key initiative to solve environmental pollution and achieve resource recycling, environmental improvement, and high-quality development in rural areas. Under the perspective of "external support-internal drive", this paper adopts the survey data of 2628 rural residents in Jiangsu province to analyze the influence and spatial effect of policy support (PS) on the behavior and effectiveness of rural residents' domestic waste separation and the mediating effect of environmental protection perception using the PSM and Sobel test. The study found that: (1) PS has a significant positive effect on the governance of the domestic residents' waste classification in rural areas. The variation in classification behavior (BWC) is more obvious than classification effectiveness (EWC). (2) PS has a significant difference in the positive influence on waste separation by regions. Specifically, the enhancement effect of PS on BWC decreases from south to north, and the enhancement effect on EWC is more obvious in southern Jiangsu than in central Jiangsu, but not significant in northern Jiangsu. (3) The mediating effect indicates that PS promotes the enhancement of BWC and EWC by strengthening farmers' environmental protection perceptions, and the effect of EWC enhancement is more obvious. Drawing on the results of this paper, the government should improve the policy support system for waste classification, strengthen environmental protection-related policy publicity and knowledge popularization, stimulate the endogenous motivation of rural residents, narrow the regional environmental governance gap, and promote green and sustainable development in rural areas.
Keywords: classification behavior; classification effectiveness; domestic waste classification; environmental protection perception; policy support.