Effects of nitrogen deposition on the carbon budget and water stress in Central Asia under climate change

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Journal of Arid Land Pub Date : 2024-08-27 DOI:10.1007/s40333-024-0022-2
Qifei Han, Wei Xu, Chaofan Li
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Abstract

Atmospheric deposition of nitrogen (N) plays a significant role in shaping the structure and functioning of various terrestrial ecosystems worldwide. However, the magnitude of N deposition on grassland ecosystems in Central Asia still remains highly uncertain. In this study, a multi-data approach was adopted to analyze the distribution and amplitude of N deposition effects in Central Asia from 1979 to 2014 using a process-based denitrification decomposition (DNDC) model. Results showed that total vegetation carbon (C) in Central Asia was 0.35 (±0.09) Pg C/a and the averaged water stress index (WSI) was 0.20 (±0.02) for the whole area. Increasing N deposition led to an increase in the vegetation C of 65.56 (±83.03) Tg C and slightly decreased water stress in Central Asia. Findings of this study will expand both our understanding and predictive capacity of C characteristics under future increases in N deposition, and also serve as a valuable reference for decision-making regarding water resources management and climate change mitigation in arid and semi-arid areas globally.

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气候变化下氮沉降对中亚碳预算和水资源压力的影响
大气中的氮(N)沉积在塑造全球各种陆地生态系统的结构和功能方面发挥着重要作用。然而,氮沉降对中亚地区草原生态系统的影响程度仍然非常不确定。本研究采用多数据方法,利用基于过程的反硝化分解(DNDC)模型,分析了1979年至2014年中亚地区氮沉降效应的分布和幅度。结果表明,中亚地区的植被总碳量(C)为 0.35 (±0.09) Pg C/a,整个地区的平均水分胁迫指数(WSI)为 0.20 (±0.02)。氮沉降量的增加导致中亚地区植被 C 增加了 65.56 (±83.03) Tg C,并略微减轻了水胁迫。这项研究的结果将拓展我们对未来氮沉积增加情况下碳特征的理解和预测能力,也将为全球干旱和半干旱地区水资源管理和减缓气候变化的决策提供有价值的参考。
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来源期刊
Journal of Arid Land
Journal of Arid Land ENVIRONMENTAL SCIENCES-
CiteScore
4.70
自引率
6.70%
发文量
768
审稿时长
3.2 months
期刊介绍: The Journal of Arid Land is an international peer-reviewed journal co-sponsored by Xinjiang Institute of Ecology and Geography, the Chinese Academy of Sciences and Science Press. It aims to meet the needs of researchers, students and practitioners in sustainable development and eco-environmental management, focusing on the arid and semi-arid lands in Central Asia and the world at large. The Journal covers such topics as the dynamics of natural resources (including water, soil and land, organism and climate), the security and sustainable development of natural resources, and the environment and the ecology in arid and semi-arid lands, especially in Central Asia. Coverage also includes interactions between the atmosphere, hydrosphere, biosphere, and lithosphere, and the relationship between these natural processes and human activities. Also discussed are patterns of geography, ecology and environment; ecological improvement and environmental protection; and regional responses and feedback mechanisms to global change. The Journal of Arid Land also presents reviews, brief communications, trends and book reviews of work on these topics.
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