美国犹他大学William R. L. Anderegg和Antoine Cabon研究团队合作发现碳同化（源）与形成层活动（汇）的跨生物群落合成限制树木生长。相关论文于2022年5月13日发表在《科学》杂志上。

他们通过将涡度协方差总初级生产与广泛的现场和区域树木年轮观测相结合，量化了生物群落的源汇关系。他们发现碳同化和树木生长之间存在广泛的时间脱钩，这得益于这两个过程的对比气候敏感性。确定了被子植物和裸子植物之间同化-生长脱钩的显著差异，以及与冠层关闭、干旱和温度降低的更强脱钩。他们的研究结果揭示了对树木生长的普遍汇控制，这在全球气候变化下可能会越来越突出。

据了解，树木碳分配到生长的不确定性环境是对森林碳封存和应对气候变化的预测的主要限制。源或汇介导木材生产的普遍性和程度从根本上说是重要的，并且仍不清楚。

附：英文原文

Title: Cross-biome synthesis of source versus sink limits to tree growth

Author: Antoine Cabon, Steven A. Kannenberg, Altaf Arain, Flurin Babst, Dennis Baldocchi, Soumaya Belmecheri, Nicolas Delpierre, Rossella Guerrieri, Justin T. Maxwell, Shawn McKenzie, Frederick C. Meinzer, David J. P. Moore, Christoforos Pappas, Adrian V. Rocha, Paul Szejner, Masahito Ueyama, Danielle Ulrich, Caroline Vincke, Steven L. Voelker, Jingshu Wei, David Woodruff, William R. L. Anderegg

Issue&Volume: 2022-05-13

Abstract: Uncertainties surrounding tree carbon allocation to growth are a major limitation to projections of forest carbon sequestration and response to climate change. The prevalence and extent to which carbon assimilation (source) or cambial activity (sink) mediate wood production are fundamentally important and remain elusive. We quantified source-sink relations across biomes by combining eddy-covariance gross primary production with extensive on-site and regional tree ring observations. We found widespread temporal decoupling between carbon assimilation and tree growth, underpinned by contrasting climatic sensitivities of these two processes. Substantial differences in assimilation-growth decoupling between angiosperms and gymnosperms were determined, as well as stronger decoupling with canopy closure, aridity, and decreasing temperatures. Our results reveal pervasive sink control over tree growth that is likely to be increasingly prominent under global climate change.

DOI: abm4875

Source: https://www.science.org/doi/10.1126/science.abm4875