Influences of drought on the stability of an alpine meadow ecosystem

IF 4.2 2区环境科学与生态学 Q1 ECOLOGY

Ecosystem Health and Sustainability Pub Date : 2022-08-05 DOI:10.1080/20964129.2022.2110523

Tao Zhang, Ximeng Ji, Mingjie Xu, Guang Zhao, Zhoutao Zheng, Y. Tang, Ning Chen, Juntao Zhu, Yongtao He, Yang-jian Zhang

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引用次数: 2

Abstract

ABSTRACT Drought plays a prominent role in affecting ecosystem stability and ecosystem productivity. Based on eddy covariance and climatic observations during 2012–2020, the Fisher discriminant analysis method was employed to accurately detect drought occurrences. Furthermore, the ecosystem water sensitivity and its resistance to drought were quantified to evaluate the ecosystem stability. The results showed that the alpine meadow suffered drought most frequently at the beginning of the growing seasons. However, drought during the peak growing seasons reduced the gross primary productivity (GPP) the most, by 30.5 ± 15.2%. In the middle of the peak growing seasons, the ecosystem water sensitivity was weak, and thus, the resistance to drought was strong, which resulted in high ecosystem stability. At the beginning and end of the peak growing seasons, the ecosystem stability was relatively weak. Ecosystem stability was positively related to the corresponding multiyear average soil water content (SWCave). However, drought occurring during high SWCave periods led to larger reductions in GPP, which indicated that the inhibitory effects of drought on ecosystems were more dependent on the occurrence time of droughts than on ecosystem stability.

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干旱对高寒草甸生态系统稳定性的影响

摘要干旱在影响生态系统稳定性和生态系统生产力方面发挥着重要作用。基于2012-2012年期间的涡度协方差和气候观测，采用Fisher判别分析方法准确检测干旱发生。此外，还对生态系统的水分敏感性及其抗旱性进行了量化，以评价生态系统的稳定性。结果表明，高寒草甸在生长季节初期干旱最为频繁。但是，生长旺季干旱使总初级生产力（GPP）下降幅度最大，达30.5±15.2%。生长旺季中期，生态系统水分敏感性较弱，抗旱性较强，生态系统稳定性较高。在生长高峰期的开始和结束，生态系统的稳定性相对较弱。生态系统稳定性与相应的多年平均土壤含水量（SWCave）呈正相关。然而，高SWCave时期发生的干旱导致GPP的大幅降低，这表明干旱对生态系统的抑制作用更多地取决于干旱的发生时间，而不是生态系统的稳定性。

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

Ecosystem Health and Sustainability Environmental Science-Management, Monitoring, Policy and Law

CiteScore

7.10

自引率

2.00%

发文量

审稿时长

22 weeks

期刊介绍： Ecosystem Health and Sustainability publishes articles on advances in ecology and sustainability science, how global environmental change affects ecosystem health, how changes in human activities affect ecosystem conditions, and system-based approaches for applying ecological science in decision-making to promote sustainable development. Papers focus on applying ecological theory, principles, and concepts to support sustainable development, especially in regions undergoing rapid environmental change. Papers on multi-scale, integrative, and interdisciplinary studies, and on international collaborations between scientists from industrialized and industrializing countries are especially welcome. Suitable topics for EHS include: • Global, regional and local studies of international significance • Impact of global or regional environmental change on natural ecosystems • Interdisciplinary research involving integration of natural, social, and behavioral sciences • Science and policy that promote the use of ecological sciences in decision making • Novel or multidisciplinary approaches for solving complex ecological problems • Multi-scale and long-term observations of ecosystem evolution • Development of novel systems approaches or modeling and simulation techniques • Rapid responses to emerging ecological issues.