中国旱地群落时间稳定性的不同驱动机制

IF 14 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Environmental Science and Ecotechnology Pub Date : 2024-03-01 DOI:10.1016/j.ese.2024.100404
Kai Wang , Cong Wang , Bojie Fu , Jianbei Huang , Fangli Wei , Xuejing Leng , Xiaoming Feng , Zongshan Li , Wei Jiang
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引用次数: 0

摘要

气候变化和人为活动正以前所未有的速度重塑全球旱地生态系统,危及其稳定性。这些生态系统的稳定性对于维持生态平衡和支持当地社区至关重要。然而,由于缺乏全面的实地数据,人们对这些生态系统的稳定性机制知之甚少。在此,我们将中国旱地的横断面调查与遥感技术结合起来,展示了整个干旱谱系中群落时间稳定性的模式及其决定因素。我们的研究结果表明,群落时间稳定性与干旱度之间呈 "U "型关系,在干旱度为 0.88 时,群落时间稳定性会发生关键性变化。在干旱程度较低的地区(干旱程度低于 0.88),降水量和生物多样性的增加与群落生产力和稳定性的提高有关。相反,在较干旱地区(干旱度高于 0.88),土壤有机碳和生物多样性的增加与群落生产力的更大波动和稳定性的降低有关。我们的研究确定了中国干旱地区群落稳定性发生显著变化的临界干旱阈值,强调了在不同干旱背景下驱动生态系统稳定性的不同机制的重要性。这些见解对于针对旱地保护的独特挑战制定明智的生态系统管理和政策战略至关重要。
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Divergent driving mechanisms of community temporal stability in China's drylands

Climate change and anthropogenic activities are reshaping dryland ecosystems globally at an unprecedented pace, jeopardizing their stability. The stability of these ecosystems is crucial for maintaining ecological balance and supporting local communities. Yet, the mechanisms governing their stability are poorly understood, largely due to the scarcity of comprehensive field data. Here we show the patterns of community temporal stability and its determinants across an aridity spectrum by integrating a transect survey across China's drylands with remote sensing. Our results revealed a U-shaped relationship between community temporal stability and aridity, with a pivotal shift occurring around an aridity level of 0.88. In less arid areas (aridity level below 0.88), enhanced precipitation and biodiversity were associated with increased community productivity and stability. Conversely, in more arid zones (aridity level above 0.88), elevated soil organic carbon and biodiversity were linked to greater fluctuations in community productivity and reduced stability. Our study identifies a critical aridity threshold that precipitates significant changes in community stability in China's drylands, underscoring the importance of distinct mechanisms driving ecosystem stability in varying aridity contexts. These insights are pivotal for developing informed ecosystem management and policy strategies tailored to the unique challenges of dryland conservation.

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来源期刊
CiteScore
20.40
自引率
6.30%
发文量
11
审稿时长
18 days
期刊介绍: Environmental Science & Ecotechnology (ESE) is an international, open-access journal publishing original research in environmental science, engineering, ecotechnology, and related fields. Authors publishing in ESE can immediately, permanently, and freely share their work. They have license options and retain copyright. Published by Elsevier, ESE is co-organized by the Chinese Society for Environmental Sciences, Harbin Institute of Technology, and the Chinese Research Academy of Environmental Sciences, under the supervision of the China Association for Science and Technology.
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