| 摘要: |
| 目的 长江经济带作为我国生态保护和经济发展的重点地区，农业面源污染形势严峻，对区域生态环境和经济发展产生严重影响。分析长江经济带的农业面源污染程度，可为治理长江经济带农业面源污染和提升生态环境质量提供参考。方法 文章基于2010—2020年历史统计数据以及栅格数据，采用清单分析法和等标污染负荷法核算了长江经济带110个地级市的农业面源污染排放量和负荷量，分析了农村生活、畜禽养殖业、种植业污染源和COD、氨氮、总氮、总磷污染物的时间变化趋势和空间分布特征，阐明了农业面源污染的重点污染年份、高度污染地区和主要污染源。结果 （1）与2010年相比，2020年长江经济带农业面源污染排放量整体降幅12.10%，农业源COD、总氮、氨氮排放总量分别降幅13.53%、6.94%、13.02%。（2）整体来看，长江经济带中下游地区农业面源污染排放强度高于上游地区，排放强度较大的地区主要涉及湖南省和浙江省的部分地级市。（3）3种污染源对长江经济带农业面源污染的贡献率依次为农村生活＞畜禽养殖业＞种植业，4种污染物贡献率为总氮＞总磷＞氨氮＞COD。（4）根据等标负荷比，将长江经济带划分为7种污染类型，农村生活污染型占比最大，在上游和中游地区的覆盖率分别达40%、71%。结论 客观分析了2010—2020年长江经济带的农业面源污染情况，对污染源进行了深度剖析，所得结果可为长江经济带农业面源污染防治提供参考依据。 |
| 关键词: 农业面源污染 时空变化 污染来源 污染类型 长江经济带 |
| DOI：10.7621/cjarrp.1005-9121.20250506 |
| 分类号:X52 |
| 基金项目:国家自然科学基金青年项目“环境规制下三陕库区水污染负荷精细测度与分配优化策略研究”(72004116)；湖北省自然科学基金面上项目“湖北省减污降碳协同增效的研究规律与区域联动优化策略”（2022CFB292）；三峡库区生态环境教育部工程研究中心开放基金课题“精细尺度下三峡库区碳排放与生态系统服务价值协同优化研究”（KF2022-07）；水电工程施工与管理湖北省重点实验室（三峡大学）开放基金课题资助项目“水足迹视角下南水北调中线水源区水资源利用效率研究”（2023KSD28） |
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| ANALYSIS OF THE SOURCES OF AGRICULTURAL NON-POINT SOURCE POLLUTION IN PREFECTURE-LEVEL CITIES IN THE YANGTZE RIVER ECONOMIC BELT |
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Lai Shiqi1,2, An Min1,3, An Hui1,2, Song Mengfei3, Wu Hailin1,2
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1.Hubei Provincial Key Laboratory of Hydropower Engineering Construction and Management (China Three Gorges University), Yichang 443002, Hubei, China;2.School of Water Resources and Environment, China Three Gorges University, Yichang 443002, Hubei, China;3.School of Economics and Management, China Three Gorges University, Yichang 443002, Hubei, China
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| Abstract: |
| As a key area of ecological protection and economic development in China, the Yangtze River Economic Belt faces severe agricultural non-point source pollution, which has a serious impact on the regional ecological environment and economic development. Analyzing the degree of agricultural non-point source pollution in the Yangtze River Belt can provide a reference for controlling agricultural non-point source pollution and improving ecological environment quality in the Yangtze River Economic Belt. Based on the historical statistical and raster data from 2010 to 2020, the agricultural non-point source pollution emissions and loads of 110 prefecture level cities in the Yangtze River Economic Belt were calculated by using the inventory analysis and equal standard pollution load method. The temporal trend and spatial distribution characteristics of pollution sources and COD, ammonia nitrogen, total nitrogen and total phosphorus pollutants in rural life, livestock and poultry breeding and planting industry were analyzed, and the key pollution years, highly polluted areas and main pollution sources of agricultural non-point source pollution were clarified. The results were listed as follows. (1) Compared with 2010, the overall reduction in agricultural non-point source pollution emissions in the Yangtze River Economic Belt in 2020 was 12.10%, while the total emissions of COD, total nitrogen, and ammonia nitrogen from agricultural sources decreased by 13.53%, 6.94%, and 13.02%, respectively. (2) Overall, the agricultural non-point source pollution emission intensity in the middle and lower reaches of the Yangtze River Economic Belt was higher than that in the upper reaches, and the areas with higher emission intensity mainly involved some prefecture level cities in Hunan province and Zhejiang province. (3) The contribution rates of the three types of pollution sources to agricultural non-point source pollution in the Yangtze River Economic Belt were in the following order: rural life>livestock and poultry breeding industry>planting industry. (4) According to the equal standard load ratio, the Yangtze River Economic Belt was divided into seven types of pollution, and the rural life pollution type accounting for the largest proportion, with a coverage rate of 39.09%. Therefore, this research objectively analyzes the agricultural non-point source pollution in the Yangtze River Economic Belt from 2010 to 2020, and conducts an in-depth analysis of the pollution sources, which can provide a reference for the prevention and control of agricultural non-point source pollution in the Yangtze River Economic Belt. |
| Key words: agricultural non-point source pollution spatiotemporal changes pollution sources pollution types Yangtze River Economic Belt |
