|
| 农牧系统氮素流动对云南高原湖泊氮污染的影响 |
| Effect of nitrogen flows from the cropland and livestock system on nitrogen pollution in the plateau lakes of Yunnan province |
| 投稿时间：2025-10-31 修订日期：2025-12-15 |
| DOI： |
| 中文关键词: 云南省 高原湖泊 农田-畜牧系统 NUFER模型 |
| 英文关键词: Yunnan province Plateau lakes Cropland and livestock system NUFER mode |
| 基金项目:国家重点研发计划项目（2024YFD1700205），中国国家自然科学基金（U24A20635，42507559） |
|
| 摘要点击次数: 415 |
| 全文下载次数: 0 |
| 中文摘要: |
| 农田-畜牧系统氮素环境排放是影响河流、湖泊等水环境的重要因素,然而环境管理政策下农牧系统氮素流动对高原湖泊水环境的影响效果仍不明确。本研究基于县域尺度的食物链养分流动模型(Nutrient flow in food chain, environment and resources use, NUFER)量化2012年、2022年云南省农牧系统氮素流动特征,评估了十八大以来云南省环境管理措施对高原湖泊水环境保护的效果。结果表明(1)2012-2022年间云南省环境管理措施的落实使得农田系统氮素投入减少35.38万t,畜牧系统氮素投入减少26.01万t,农牧系统的氮素综合利用效率从25.1%增加到28.4%。(2)高原湖泊环境保护措施落实重构了云南省农牧系统氮素输入格局,由以滇中地区的单一核心,演变为以滇中与滇西两大湖泊群落为核心的双中心体系。(3)2012到2022年云南省农牧系统氮素环境排放减少46.7万t,其中进入大气的氮损失从100.2万t下降到79.6万t,进入河流的氮损失从51.5万t下降到25.4万t,降幅分别达到20.5%和50.6%。研究表明,十八大以来云南省环境管理措施的落实极大地缓解了九大高原湖泊面临的氮污染问题,本研究或可为区域绿色发展评估提供现实案例,以推动理论发展。 |
| 英文摘要: |
| Nitrogen emissions from cropland and livestock systems are a major contributor to the deterioration of water quality in rivers and lakes. However, the effectiveness of environmental management policies in mitigating the impact of nitrogen flows from these systems on plateau lake water quality remains inadequately understood. This study employed the county-scale Nutrient Flows in Food chains, Environment and Resources use (NUFER) model to quantify the characteristics of nitrogen flows within the cropland and livestock systems of Yunnan Province in 2012 and 2022. It aimed to assess the impact of environmental management measures implemented since the 18th National Congress of the Communist Party of China on the protection of plateau lake water environments. The results indicated that: (1) The implementation of environmental management policies from 2012 to 2022 led to a reduction of 353.8 thousand tonnes in nitrogen input into the cropland system and a reduction of 260.1 thousand tonnes in the livestock system. The integrated nitrogen use efficiency of the cropland and livestock systems increased from 25.1% to 28.4%. (2) Influenced particularly by the enforcement of plateau lake protection measures, the spatial pattern of nitrogen input in Yunnan Province was reconfigured. It shifted from a radial pattern, centered on Kunming and decreasing towards the periphery, to a new pattern centered on the central and western Yunnan lake clusters with increasing inputs towards their surroundings. (3) Total environmental nitrogen losses from the cropland and livestock systems decreased by 467.0 thousand tonnes between 2012 and 2022. Nitrogen losses to the atmosphere decreased from 1,002 thousand tonnes to 796 thousand tonnes, while nitrogen losses to water bodies decreased from 515 thousand tonnes to 254 thousand tonnes, representing reductions of 20.5% and 50.6%, respectively. This study demonstrates that the environmental management measures enacted in Yunnan since the 18th National Congress have significantly alleviated nitrogen pollution pressure on the plateau lakes. The findings provide a practical case study for regional green development assessment and can contribute to further theoretical development. |
| HTML
View Fulltext
查看/发表评论 下载PDF阅读器 |
|
|
|
