Modeling the Impact of Land Use Optimization on Non-Point Source Pollution: Evidence from Chinese Reservoir Watershed

IF 3.2 2区环境科学与生态学 Q2 ENVIRONMENTAL STUDIES

Land Pub Date : 2023-12-21 DOI:10.3390/land13010018

Guanghui Li, Lei Chang, Haoye Li, Yuefen Li

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Abstract

We assessed the effectiveness of land optimization for controlling non-point source (NPS) pollution by combining a multi-objective dynamic planning approach with the application of the Land Use and its Effects at Small regional extents model and the Soil and Water Assessment Tool. The combined modeling approach showed substantial ability to reduce NPS pollution in Shitoukoumen Reservoir, Changchun City, China, reducing the annual total loads of nitrogen and phosphorus in the study area by 8.7 and 10.12%, respectively. The total nitrogen load decreased significantly and stabilized at less than 8 kg/hm2 from a peak level of over 15 kg/hm2. Higher total phosphorus loads before land use optimization were concentrated in the central parts of the study area, with the highest values exceeding 2.3 kg/hm2, and tended to spread outward but resolved at 1.5 kg/hm2 after optimization. The results showed that from a macro-perspective, optimization of the spatial distribution and quantitative composition of land use can effectively control NPS pollution. The study also demonstrates the potential effectiveness of the coupled multi-model methodology for mitigating NPS in the future.

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模拟土地利用优化对非点源污染的影响：中国水库流域的证据

通过将多目标动态规划方法与小区域范围土地利用及其影响模型和水土评估工具的应用相结合，我们评估了土地优化在控制非点源污染方面的有效性。综合建模方法显示了减少中国长春市石窟门水库 NPS 污染的巨大能力，使研究区域的氮和磷年总负荷分别减少了 8.7% 和 10.12%。总氮负荷明显降低，从高峰期的每平方毫米 15 千克以上稳定在每平方毫米 8 千克以下。土地利用优化前，较高的总磷负荷集中在研究区域的中部，最高值超过 2.3 kg/hm2，优化后有向外扩散的趋势，但稳定在 1.5 kg/hm2。研究结果表明，从宏观角度看，优化土地利用的空间分布和数量组成可有效控制核动力源污染。该研究还证明了多模型耦合方法在未来减缓核动力源污染的潜在有效性。

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来源期刊

Land ENVIRONMENTAL STUDIES-Nature and Landscape Conservation

CiteScore

4.90

自引率

23.10%

发文量

1927

期刊介绍： Land is an international and cross-disciplinary, peer-reviewed, open access journal of land system science, landscape, soil–sediment–water systems, urban study, land–climate interactions, water–energy–land–food (WELF) nexus, biodiversity research and health nexus, land modelling and data processing, ecosystem services, and multifunctionality and sustainability etc., published monthly online by MDPI. The International Association for Landscape Ecology (IALE), European Land-use Institute (ELI), and Landscape Institute (LI) are affiliated with Land, and their members receive a discount on the article processing charge.