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Key message: <p><b>Combined measurements of carbon exchange and stem water dynamics provided new insights into physiological transitions during progressive drought-induced tree mortality.</b></p> Abstract <p>Drought-induced tree mortality significantly alters ecosystem functioning and carbon cycling, highlighting the need to quantify individual tree-level carbon sequestration responses under variable water availability. This study developed a novel assimilation chamber system coupled with a custom stem water content sensor, enabling automated, continuous, long-term in vivo monitoring of whole-tree carbon exchange and water relations. A design and function test on juvenile <i>Radermachera sinica</i> demonstrated the system’s ability to assess carbon sequestration capacity, reflected by the net CO₂ exchange rate, under different water-supply conditions. The system revealed coupled dynamics between stem water content and net CO₂ exchange, and indicated that drought stress progressively impairs water relations and carbon sequestration capacity. Overall, this innovative chamber-sensor system provides a methodological tool for investigating whole-tree carbon and water dynamics under varying environmental conditions, with potential applications beyond drought stress studies.</p>

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A novel assimilation chamber system for evaluating juvenile tree in vivo carbon exchange and water relations under drought stress: design and function test

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Zehai Xu,
  • Yandong Zhao

摘要

Key message:

Combined measurements of carbon exchange and stem water dynamics provided new insights into physiological transitions during progressive drought-induced tree mortality.

Abstract

Drought-induced tree mortality significantly alters ecosystem functioning and carbon cycling, highlighting the need to quantify individual tree-level carbon sequestration responses under variable water availability. This study developed a novel assimilation chamber system coupled with a custom stem water content sensor, enabling automated, continuous, long-term in vivo monitoring of whole-tree carbon exchange and water relations. A design and function test on juvenile Radermachera sinica demonstrated the system’s ability to assess carbon sequestration capacity, reflected by the net CO₂ exchange rate, under different water-supply conditions. The system revealed coupled dynamics between stem water content and net CO₂ exchange, and indicated that drought stress progressively impairs water relations and carbon sequestration capacity. Overall, this innovative chamber-sensor system provides a methodological tool for investigating whole-tree carbon and water dynamics under varying environmental conditions, with potential applications beyond drought stress studies.