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| Design of ecological compensation policy for non-point source pollution control technologies in paddy fields： based on choice experiments and preference mechanism analysis in the Yangtze River Delta region |
| Received:April 16, 2025 |
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| KeyWord:non-point source pollution control technologies in paddy fields;ecological compensation;choice experiments;preference mechanism;the Yangtze River Delta region |
| Author Name | Affiliation | E-mail | | ZHANG Qian | Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | SU Peihuang | College of Humanities and Social Development, Nanjing Agricultural University, Nanjing 210095, China | 2023810089@stu.njau.edu.cn | | ZHOU Yiwei | College of Economics and Management, Nanjing Forestry University, Nanjing 210037, China | | | SUN Hongwu | Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | |
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| Abstract: |
| Confronting the practical challenges of lacking popularization mechanism in controlling non-point source pollution in paddy fields and the low adoption willingness among stakeholders. Through choice experiments and preference mechanism analysis, we examined ecological compensation policy for smart drainage devices and carbon-based organic fertilizers respectively, covering 130 rice producers across 17 administrative villages in Jiangsu, Zhejiang, and Anhui Provinces. We conduct policy design research with the following findings： local finance should implement price subsidies for carbon-based organic fertilizer, and the most suitable subsidy standard for entities with a business scale of 0.667 hm2 and below is 300-460 yuan·t-1, and 300-420 yuan·t-1 for subjects above 0.667 hm2; The choice of policy scheme depends on the marginal yield and marginal cost（fertilizer and fertilization）of different organic fertilizer substitution under the differentiated subsidy standard, which has obvious scale heterogeneity. When the subsidy standard reaches different thresholds, its impact on the substitution rate of organic fertilizer has the threshold characteristics of breakpoint jump or decline. Under the scenario of not levying farmland tailwater sewage charges, it is suggested that smart drainage devices should be included in the construction of highstandard farmland, and the subsidy funds should be increased by 2 100-3 750 yuan · h m-2 on the existing basis. Under the scenario of additional sewage charges, it is suggested that smart drainage devices should be included in the list of agricultural machinery purchase subsidies, and the subsidy standard should be 1 140-2 010 yuan per unit. This study demonstrates that the selection of differentiated compensation tools and the determination of standards for different types of technologies and subjects are necessary to effectively exert the incentive effect of ecological compensation policy. |
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