Integrating river transport processes and seasonal dynamics to assess watershed nitrogen export risk

IF 10.3 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Jian Peng , Tianhan Lan , Jiabin Wang , Pei Xia , Huining Zheng
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Abstract

Excessive nitrogen exported to water bodies affects the balance of ecosystem and poses a threat to human health. Although the concept of water purification service helps quantify nitrogen export, the impact of river transport remains unclear. This study focused on nitrogen as a pollutant by utilizing the Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST) model to assess nitrogen export in the Dongting Lake Basin, taking into account both the processes of sub-basin nitrogen export and river transport. Additionally, the monthly variations within the year were further explored, together with the identification of the priority area of returning cropland to forest land. The results showed that in 2021, the total nitrogen load outside the Dongting Lake was 11.34 × 108 kg·year−1, with the sub-basins retaining a total of 9.02 × 108 kg·year−1, accounting for 79.57 % of the total nitrogen load. Notably, the total nitrogen retention by the river made up 16.87 % of the total nitrogen retention, up to 1.83 × 108 kg·year−1. In view of monthly variation, water purification service based on the entire process was higher in winter and late autumn, and lower in summer and early autumn. The priority areas for ecological project were mainly distributed around the Dongting Lake, achieving an improvement of 58.15 % in water purification service with approximately 7.02 % of the total returnable cropland. This study proposed a new approach of water purification service assessment through integrating river transport processes and seasonal dynamics, aiming to assess watershed nitrogen export risk more accurately.
整合河流运输过程和季节动态评估流域氮出口风险
过量的氮输出到水体影响生态系统的平衡,并对人类健康构成威胁。虽然水净化服务的概念有助于量化氮出口,但河流运输的影响仍不清楚。本研究以氮作为污染物为研究对象,利用生态系统服务与权衡综合评价(InVEST)模型对洞庭湖流域氮输出过程进行了评价,同时考虑了子流域氮输出过程和河流输运过程。此外,进一步探讨了年内的月度变化,并确定了退耕还林的优先区域。结果表明:2021年洞庭湖外总氮负荷为11.34 × 108 kg·year - 1,子流域总氮负荷为9.02 × 108 kg·year - 1,占总氮负荷的79.57 %。值得注意的是,河流的总氮滞留量占总氮滞留量的16.87 %,达到1.83 × 108 kg·年−1。从月度变化来看,全流程净水服务在冬季和深秋较高,在夏季和初秋较低。生态工程重点区域主要分布在洞庭湖周边,净水区水质服务改善58.15 %,可退耕面积约占7.02 %。本研究提出了一种整合河流运输过程和季节动态的净水服务评价新方法,旨在更准确地评价流域氮输出风险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Environment International
Environment International 环境科学-环境科学
CiteScore
21.90
自引率
3.40%
发文量
734
审稿时长
2.8 months
期刊介绍: Environmental Health publishes manuscripts focusing on critical aspects of environmental and occupational medicine, including studies in toxicology and epidemiology, to illuminate the human health implications of exposure to environmental hazards. The journal adopts an open-access model and practices open peer review. It caters to scientists and practitioners across all environmental science domains, directly or indirectly impacting human health and well-being. With a commitment to enhancing the prevention of environmentally-related health risks, Environmental Health serves as a public health journal for the community and scientists engaged in matters of public health significance concerning the environment.
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