Seasonal precipitation distribution determines ecosystem CO2 and H2O exchange by regulating spring soil water–salt dynamics in a brackish wetland

IF 4.6 1区环境科学与生态学 Q1 ECOLOGY Functional Ecology Pub Date : 2024-07-14 DOI:10.1111/1365-2435.14617

Wanxin Huang, Guangxuan Han, Siyu Wei, Mingliang Zhao, Xiaojing Chu, Ruifeng Sun, Nan Zou, Xiaojie Wang, Peiguang Li, Xiaoshuai Zhang, Feng Lu, Shuyan Zhang

引用次数: 0

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季节性降水分布通过调节咸水湿地春季土壤水盐动态决定生态系统的二氧化碳和水交换

全球水文循环的加剧预计将增加降水模式的变异性。咸水湿地通过调节二氧化碳和水的吸收和释放来应对降水模式的变化，从而维持生态系统功能的稳定。然而，与年降水总量相比，人们对季节间降水分布（SPD）如何影响生态系统二氧化碳和水交换的了解还很有限。在这里，我们在咸水湿地进行了连续四年的现场实验，在保持年降水总量不变的情况下，操纵不同季节的降水比例。我们的研究结果表明，随着春季降水量分布的减少，生态系统年二氧化碳和水通量呈下降趋势。其中，生态系统二氧化碳年净交换量、蒸散量、碳利用效率和水利用效率对春季降水分布减少和夏秋季降水分布增加更为敏感。这种负非对称响应模式表明，生态系统的二氧化碳和水交换量主要受季节性降水变化的影响，而春季土壤水盐动态被认为是主要驱动因素。因此，这种关联可以解释为生长初期的干旱加剧了土壤盐碱化，抑制了植被的定殖和生长，从而极大地损害了咸水湿地的年二氧化碳和水-盐交换能力。我们的研究结果强调，春季极端降水引起的土壤水-盐条件将在未来极大地影响咸水湿地的二氧化碳和水-盐交换。这些发现对于改进咸水湿地固碳和持水能力的预测至关重要。

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来源期刊

Functional Ecology 环境科学-生态学

CiteScore

9.00

自引率

1.90%

发文量

243

审稿时长

4 months

期刊介绍： Functional Ecology publishes high-impact papers that enable a mechanistic understanding of ecological pattern and process from the organismic to the ecosystem scale. Because of the multifaceted nature of this challenge, papers can be based on a wide range of approaches. Thus, manuscripts may vary from physiological, genetics, life-history, and behavioural perspectives for organismal studies to community and biogeochemical studies when the goal is to understand ecosystem and larger scale ecological phenomena. We believe that the diverse nature of our journal is a strength, not a weakness, and we are open-minded about the variety of data, research approaches and types of studies that we publish. Certain key areas will continue to be emphasized: studies that integrate genomics with ecology, studies that examine how key aspects of physiology (e.g., stress) impact the ecology of animals and plants, or vice versa, and how evolution shapes interactions among function and ecological traits. Ecology has increasingly moved towards the realization that organismal traits and activities are vital for understanding community dynamics and ecosystem processes, particularly in response to the rapid global changes occurring in earth’s environment, and Functional Ecology aims to publish such integrative papers.