Vertical canopy gradients of respiration drive plant carbon budgets and leaf area index

IF 8.1 1区生物学 Q1 PLANT SCIENCES New Phytologist Pub Date : 2025-02-19 DOI:10.1111/nph.20423

Jessica F. Needham, Sharmila Dey, Charles D. Koven, Rosie A. Fisher, Ryan G. Knox, Julien Lamour, Gregory Lemieux, Marcos Longo, Alistair Rogers, Jennifer Holm

引用次数: 0

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垂直冠层呼吸梯度驱动植物碳收支和叶面积指数。

尽管叶片呼吸对确定全球碳通量具有重要意义，但在陆地表面模式（LSMs）中，叶片呼吸的约束仍然很差。我们测试了能量百亿亿次地球系统模型陆地模型-功能组装陆地生态系统模拟器（ELM-FATES）对叶片维持呼吸（Rdark）冠层梯度变化的敏感性。通过改变Rdark的冠层梯度对森林结构、组成和碳循环的影响，进行了全局和点模拟。在全球模拟中，Rdark的冠层梯度越陡，林下植被存活率和叶片生物量增加。与默认参数化相比，热带地区的叶面积指数（LAI）增加了77%，改善了与遥感基准的一致性。整体植被碳在308 ~ 449 Pg C之间变化。在热带森林模拟中，更陡的Rdark梯度对演替动力学有较大的影响。结果表明，冠层梯度在叶片特征和通量方面对确定植物碳收支和新兴生态系统特性（如竞争动态、LAI和植被碳）具有重要意义。Rdark对冠层梯度的高模型敏感性表明，需要更多地观察叶片性状和通量如何随光微环境变化，以了解LSMs的关键动力学。

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来源期刊

New Phytologist 生物-植物科学

自引率

5.30%

发文量

728

期刊介绍： New Phytologist is an international electronic journal published 24 times a year. It is owned by the New Phytologist Foundation, a non-profit-making charitable organization dedicated to promoting plant science. The journal publishes excellent, novel, rigorous, and timely research and scholarship in plant science and its applications. The articles cover topics in five sections: Physiology & Development, Environment, Interaction, Evolution, and Transformative Plant Biotechnology. These sections encompass intracellular processes, global environmental change, and encourage cross-disciplinary approaches. The journal recognizes the use of techniques from molecular and cell biology, functional genomics, modeling, and system-based approaches in plant science. Abstracting and Indexing Information for New Phytologist includes Academic Search, AgBiotech News & Information, Agroforestry Abstracts, Biochemistry & Biophysics Citation Index, Botanical Pesticides, CAB Abstracts®, Environment Index, Global Health, and Plant Breeding Abstracts, and others.