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Interactions between labile carbon, temperature and land use regulate carbon dioxide and methane production in tropical peat
Biogeochemistry ( IF 3.9 ) Pub Date : 2019-12-18 , DOI: 10.1007/s10533-019-00632-y
N. T. Girkin , S. Dhandapani , S. Evers , N. Ostle , B. L. Turner , S. Sjögersten

Tropical peatlands are a significant carbon store and contribute to global carbon dioxide (CO 2 ) and methane (CH 4 ) emissions. Tropical peatlands are threatened by both land use and climate change, including the alteration of regional precipitation patterns, and the 3–4 °C predicted warming by 2100. Plant communities in tropical peatlands can regulate greenhouse gas (GHG) fluxes through labile carbon inputs, but the extent to which these inputs regulate the temperature response of CO 2 and CH 4 production in tropical peat remains unclear. We conducted an anoxic incubation experiment using three peat types of contrasting botanical origin to assess how carbon addition affects the temperature response (Q 10 ) of CO 2 and CH 4 production. Peats from forested peatlands in Panama and Malaysia, and a converted oil palm and pineapple intercropping system in Malaysia, differed significantly in redox potential, total carbon and carbon: nitrogen ratio. The production of CO 2 and CH 4 varied significantly among peat types and increased with increasing temperature, with Q 10 s for both gases of 1.4. Carbon addition further increased gas fluxes, but did not influence the Q 10 for CO 2 or CH 4 production or significantly affect the Q 10 of either gas. These findings demonstrate that the production of CO 2 and CH 4 in tropical peat is sensitive to warming and varies among peat types, but that the effect of root inputs in altering Q 10 appears to be limited.

中文翻译:

不稳定碳、温度和土地利用之间的相互作用调节热带泥炭中的二氧化碳和甲烷产量

热带泥炭地是重要的碳储存库,并导致全球二氧化碳 (CO 2 ) 和甲烷 (CH 4 ) 排放。热带泥炭地受到土地利用和气候变化的威胁,包括区域降水模式的改变,以及预计到 2100 年变暖 3-4 °C。热带泥炭地中的植物群落可以通过不稳定的碳输入调节温室气体 (GHG) 通量,但这些输入在多大程度上调节热带泥炭中 CO 2 和 CH 4 生产的温度响应仍不清楚。我们使用三种不同植物来源的泥炭类型进行了缺氧孵化实验,以评估碳添加如何影响 CO 2 和 CH 4 生产的温度响应 (Q 10 )。来自巴拿马和马来西亚森林泥炭地的泥炭,和马来西亚转化的油棕和菠萝间作系统,在氧化还原电位、总碳和碳:氮比方面存在显着差异。CO 2 和CH 4 的产量在泥炭类型之间差异很大,并且随着温度的升高而增加,两种气体的Q 10 s 均为1.4。添加碳进一步增加了气体通量,但不影响CO 2 或CH 4 生产的Q 10 或显着影响任一气体的Q 10 。这些发现表明,热带泥炭中 CO 2 和 CH 4 的产生对变暖很敏感,并且因泥炭类型而异,但根输入对改变 Q 10 的影响似乎有限。CO 2 和CH 4 的产量在泥炭类型之间差异很大,并且随着温度的升高而增加,两种气体的Q 10 s 均为1.4。添加碳进一步增加了气体通量,但不影响CO 2 或CH 4 生产的Q 10 或显着影响任一气体的Q 10 。这些发现表明,热带泥炭中 CO 2 和 CH 4 的产生对变暖很敏感,并且因泥炭类型而异,但根输入对改变 Q 10 的影响似乎有限。CO 2 和CH 4 的产量在泥炭类型之间差异很大,并且随着温度的升高而增加,两种气体的Q 10 s 均为1.4。添加碳进一步增加了气体通量,但不影响CO 2 或CH 4 生产的Q 10 或显着影响任一气体的Q 10 。这些发现表明,热带泥炭中 CO 2 和 CH 4 的产生对变暖很敏感,并且因泥炭类型而异,但根输入对改变 Q 10 的影响似乎有限。
更新日期:2019-12-18
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