量化生态系统压力-体积关系的理论框架。

IF 10.8 1区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Global Change Biology Pub Date : 2024-11-05 DOI:10.1111/gcb.17567
Oliver Binks, Patrick Meir, Alexandra G. Konings, Lucas Cernusak, Bradley O. Christoffersen, William R. L. Anderegg, Jeffrey Wood, Lawren Sack, Jordi Martinez-Vilalta, Maurizio Mencuccini
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引用次数: 0

摘要

水势 "是衡量植被水分状况的生物物理相关指标,与气孔、冠层和水力传导以及死亡阈值有关;然而,如果不了解 "水势 "与 "含水量 "之间的关系,就无法将 "水势 "与地块到景观尺度的实测和模拟水分通量直接联系起来。通过微波遥感探测植被含水量的能力进一步提高了了解含水量与生态系统功能之间联系的必要性。在本综述中,我们将借鉴现有的压力-体积(PV)关系理论,探讨如何在生态系统尺度上将水状况、水势和含水量等基本指标联系起来。我们定义并评估了将压力-体积关系应用于生态系统的概念和局限性,在这种生态系统中,水量会因植物水分状况而在短时间内发生变化,也会因植被结构变化而在更长的时间尺度和更大的区域内发生变化。作为概念验证,根据九个地块(包括热带雨林、热带稀树草原、温带森林和亚马逊雨林长期干旱实验)的平衡(如黎明前)水势和地上生物量的含水量,生成了地块尺度的地上植被 PV 曲线。初步研究结果表明,在不同的系统中,储水量和生态系统容积与生物量成线性比例关系,而生态系统水力容积和生理可利用储水量的相对值则不随生物量的变化而变化。生态系统水分关系的自下而上的缩放方法确定了描述群落内水势分布特征的必要性,同时也揭示了群落级植物组织部分与生态系统水分关系的相关性。我们相信,这一理论将有助于把我们对组织尺度生物物理过程的详细了解与陆地表面模型运行的尺度以及塔基、机载和卫星遥感可提供信息的尺度联系起来。
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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A Theoretical Framework to Quantify Ecosystem Pressure-Volume Relationships

‘Water potential’ is the biophysically relevant measure of water status in vegetation relating to stomatal, canopy and hydraulic conductance, as well as mortality thresholds; yet, this cannot be directly related to measured and modelled fluxes of water at plot- to landscape-scale without understanding its relationship with ‘water content’. The capacity for detecting vegetation water content via microwave remote sensing further increases the need to understand the link between water content and ecosystem function. In this review, we explore how the fundamental measures of water status, water potential and water content are linked at ecosystem-scale drawing on the existing theory of pressure-volume (PV) relationships. We define and evaluate the concept and limitations of applying PV relationships to ecosystems where the quantity of water can vary on short timescales with respect to plant water status, and over longer timescales and over larger areas due to structural changes in vegetation. As a proof of concept, plot-scale aboveground vegetation PV curves were generated from equilibrium (e.g., predawn) water potentials and water content of the above ground biomass of nine plots, including tropical rainforest, savanna, temperate forest, and a long-term Amazonian rainforest drought experiment. Initial findings suggest that the stored water and ecosystem capacitance scale linearly with biomass across diverse systems, while the relative values of ecosystem hydraulic capacitance and physiologically accessible water storage do not vary systematically with biomass. The bottom-up scaling approach to ecosystem water relations identified the need to characterise the distribution of water potentials within a community and also revealed the relevance of community-level plant tissue fractions to ecosystem water relations. We believe that this theory will be instrumental in linking our detailed understanding of biophysical processes at tissue-scale to the scale at which land surface models operate and at which tower-based, airborne and satellite remote sensing can provide information.

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来源期刊
Global Change Biology
Global Change Biology 环境科学-环境科学
CiteScore
21.50
自引率
5.20%
发文量
497
审稿时长
3.3 months
期刊介绍: Global Change Biology is an environmental change journal committed to shaping the future and addressing the world's most pressing challenges, including sustainability, climate change, environmental protection, food and water safety, and global health. Dedicated to fostering a profound understanding of the impacts of global change on biological systems and offering innovative solutions, the journal publishes a diverse range of content, including primary research articles, technical advances, research reviews, reports, opinions, perspectives, commentaries, and letters. Starting with the 2024 volume, Global Change Biology will transition to an online-only format, enhancing accessibility and contributing to the evolution of scholarly communication.
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