Foliar methane and nitrous oxide fluxes in Salix bebbiana respond to light and soil factors.

IF 8.9 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Communications Earth & Environment Pub Date : 2025-01-01 Epub Date: 2025-06-21 DOI:10.1038/s43247-025-02453-4
Md Rezaul Karim, Md Abdul Halim, Sean C Thomas
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引用次数: 0

Abstract

Foliar exchange of methane and nitrous oxide is a significant yet poorly understood component of global greenhouse gas budgets. To address this knowledge gap, we investigated foliar methane and nitrous oxide fluxes in Salix bebbiana, under varying light conditions (0-2000 μmol·m-2·s-1), soil aeration, and nitrogen availability, manipulated via biochar incorporation and nitrogen additions. Using rapid spectroscopic gas analysers, we observed consistent net foliar methane oxidation and nitrous oxide emission across all light conditions, demonstrating saturating light response patterns. Maximum flux rates were significantly more sensitive to soil conditions than carbon dioxide or water vapour exchange. Analysis revealed foliar methane and nitrous oxide fluxes overwhelmingly regulated by internal leaf processes like xylem transport, with modulation by external light intensity. These predictable light-response patterns provide a basis for scaling leaf-level methane and nitrous oxide fluxes, enhancing accuracy in predicting biogenic greenhouse gas fluxes within ecosystem and biosphere models.

黄柳叶片甲烷和氧化亚氮通量对光照和土壤因子的响应。
叶面甲烷和一氧化二氮的交换是全球温室气体收支中一个重要但鲜为人知的组成部分。为了解决这一知识空白,我们研究了不同光照条件(0-2000 μmol·m-2·s-1)、土壤通气性和氮有效性下柳叶甲烷和氧化亚氮的通量,并通过生物炭掺入和添加氮进行了控制。利用快速光谱气体分析仪,我们在所有光照条件下观察到一致的净叶面甲烷氧化和一氧化二氮排放,展示了饱和光响应模式。最大通量速率对土壤条件的敏感性明显高于二氧化碳或水蒸气交换。分析显示,叶面甲烷和氧化亚氮的通量主要受木质部运输等叶片内部过程的调节,并受外部光强的调节。这些可预测的光响应模式为估算叶片水平的甲烷和氧化亚氮通量提供了基础,提高了在生态系统和生物圈模型中预测生物源性温室气体通量的准确性。
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来源期刊
Communications Earth & Environment
Communications Earth & Environment Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
8.60
自引率
2.50%
发文量
269
审稿时长
26 weeks
期刊介绍: Communications Earth & Environment is an open access journal from Nature Portfolio publishing high-quality research, reviews and commentary in all areas of the Earth, environmental and planetary sciences. Research papers published by the journal represent significant advances that bring new insight to a specialized area in Earth science, planetary science or environmental science. Communications Earth & Environment has a 2-year impact factor of 7.9 (2022 Journal Citation Reports®). Articles published in the journal in 2022 were downloaded 1,412,858 times. Median time from submission to the first editorial decision is 8 days.
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