| 粤港澳大湾区陆源氮污染来源结构与空间分布 |
| 摘要点击 1797 全文点击 595 投稿时间：2021-02-12 修订日期：2021-04-25 |
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| 中文关键词 粤港澳大湾区(GBA) 陆源污染 氮 污染压力 空间分布 |
| 英文关键词 Guangdong-Hong Kong-Macao Greater Bay Area(GBA) land-based pollution nitrogen pollution pressure spatial distribution |
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| 中文摘要 |
| 入海河流携带的陆源总氮污染是海域无机氮的主要来源，粤港澳大湾区（GBA）近岸海域无机氮污染严重，劣四类水质分布广泛，厘清粤港澳大湾区陆域总氮排放规模、来源结构和排海压力，对海域氮污染治理有重要意义.基于土地利用、社会经济统计和污染普查资料等多源数据，从行政区单元和流域单元估算粤港澳大湾区及周边城市的总氮排放规模、来源结构及其区域差异.结果表明：①研究区陆域总氮排放量约33.25万t，居民生活是主要污染源，占55.4%，其次为种植业，占28.18%，养殖业和工业生产的污染贡献相对有限.②总氮排放的区域差异明显，粤港澳大湾区11个城市的总氮排放量（23.14万t）显著高于其周边8个城市（10.11万t）.③海域污染分布状况与陆源氮污染排放压力强度具有空间一致性，东江流域、西北江三角洲流域和潭江流域污染排放量最大，其岸段承载的排放压力也最大，对应的伶仃洋、珠海金湾海域和黄茅海污染严重. |
| 英文摘要 |
| Total nitrogen pollution from land-based sources carried by rivers is the main source of inorganic nitrogen entering the sea. Inorganic nitrogen pollution in the coastal waters of Guangdong-Hong Kong-Macao Greater Bay Area(GBA) is a serious problem. The water quality of an adjacent large area of the sea is classified as poor-category Ⅳ. Therefore, clarification of the scale, structure, and discharge pressure of nitrogen emissions from the land area of the GBA is needed to manage marine nitrogen pollution. Based on multi-source data, including land use, socio-economic statistics, and pollution source census information, the scale, source structure, and regional differences of total nitrogen discharge in GBA and surrounding cities were evaluated using administrative and watershed units. The results show that:①The total nitrogen emissions from the study area are approximately 332500 t. Residential waste is the main source of pollution, accounting for 55.4%, followed by cultivation, with 28.18%, while the contribution from animal husbandry and industrial production is relatively limited. ②The regional differences of total nitrogen emissions are obvious, and the total emissions from GBA(231400 t) are significantly higher than those from neighboring cities(101100 t). ③The distribution of marine pollution and intensity of land-based nitrogen pollution emissions are spatially consistent, which indicates that there is a large number of pollution emissions in the East River Basin, Northwest River Delta Basin, and Tan River Basin; the shoreline sections belonging to the basins carry the greatest emission pressure, lead to serious pollution in the Lingding Sea, Jin Bay, and Huangmao Sea. |
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