Plant functional type indirectly affects peatland carbon fluxes and their sensitivity to environmental change
Plant functional type indirectly affects peatland carbon fluxes and their sensitivity to environmental change
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植物功能类型间接影响泥炭地碳通量及其对环境变化的敏感性
DOI：
10.1111/ejss.13048
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发表时间：
2020
影响因子：
4.2
通讯作者：
Whitaker J
中科院分区：
文献类型：
--
作者：
Whitaker J
泥炭地碳通量对气候和水文变化的敏感性是不确定的，因为植物和泥炭性质之间的复杂相互作用。在这项研究中，我们研究如何泥炭核心采取下三种植物功能类型（PFT）（bragiete，graminoid和ericoid）不同的生物和非生物特性，这是如何间接调节C通量对环境变化的响应。从三个PFT下采集的泥炭芯去除了地上植被，以排除直接的植物介导的影响，并在12、14和16°C（气温）的温度×地下水位因子实验中进行培养，地下水位低于泥炭表面-25、-15或-5 cm。二氧化碳（CO2）和甲烷（CH 4）通量的测量超过11个月。CO2和CH 4的排放量随着温度的增加而增加，与地下水位的增加存在强烈的正（CH 4）和负（CO2）相互作用。PFT的去除对CH 4的环境敏感性有显著影响，但对CO2排放通量无显著影响。CH 4排放量最大，在泥炭与禾本科PFT在最温暖的温度下，但这些间接的影响不能解释泥炭的非生物或生物特性，PFT之间没有区别。这些结果表明，气候变化引起的北方泥炭地禾本科植物的扩张将对碳通量和泥炭地碳储量的稳定性产生直接和间接的影响。这些响应将取决于植被组成、水文和变暖对甲烷循环微生物群落的相互作用。HighlightsPeatland碳通量强度在变化的气候下受到PFT的影响。来自禾本科PFT下的泥炭比来自brituite或ericoid PFT下的泥炭排放更多的甲烷。之前的PFT覆盖影响甲烷排放，但不影响泥炭的非生物或生物特性。随着气候变化，禾本科植被覆盖的增加可以间接增加泥炭地甲烷通量。
The sensitivity of peatland carbon (C) fluxes to changes in climate and hydrology are uncertain due to the complex interactions between plants and peat properties. In this study we examine how peat cores taken from under three plant functional types (PFT) (bryophyte, graminoid and ericoid) differ in their biotic and abiotic properties and how this indirectly modulates the response of C fluxes to environmental change. Peat cores taken from under three PFTs had their aboveground vegetation removed to exclude direct plant‐mediated effects, and were incubated in a temperature × water table factorial experiment at 12, 14 and 16°C (air temperature) with the water table level −25, −15 or −5 cm below the peat surface. Carbon dioxide (CO2) and methane (CH4) fluxes were measured over 11 months. Emissions of CO2and CH4increased with temperature, with strong positive (CH4) and negative (CO2) interactions with increasing water table level. There were significant effects of removed PFT on the environmental sensitivity of CH4, but not CO2fluxes. CH4emissions were greatest in peat with graminoid PFT removed at the warmest temperature but these indirect effects were not explained by peat abiotic or biotic properties, which did not differ between PFTs. These results show that climate change‐induced expansion of graminoids in northern peatlands will have direct and indirect effects on C fluxes and the stability of peatland C stores. These responses will be determined by the interactive effects of vegetation composition, hydrology and warming on methane‐cycling microbial communities.HighlightsPeatland carbon flux strength under a changing climate is influenced by PFT.Peat from under graminoid PFT emits more methane than peat from under bryophyte or ericoid PFT.Prior PFT cover influenced methane emissions, but did not affect peat abiotic or biotic properties.Increases in graminoid cover with climate change could indirectly increase peatland methane fluxes.
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影响因子：
30.7
作者：
Liming Zhou;Yuhong Tian;S. Roy;C. Thorncroft;L. Bosart;Yuanlong Hu
通讯作者：
Liming Zhou;Yuhong Tian;S. Roy;C. Thorncroft;L. Bosart;Yuanlong Hu
影响因子：
8.8
作者：
Susan E. Ward;N. Ostle;S. Oakley;H. Quirk;P. Henrys;R. Bardgett
通讯作者：
Susan E. Ward;N. Ostle;S. Oakley;H. Quirk;P. Henrys;R. Bardgett
影响因子：
11.6
作者：
M. Turetsky;A. Kotowska;J. Bubier;N. Dise;P. Crill;E. Hornibrook;K. Minkkinen;T. Moore;I. Myers-Smith
通讯作者：
M. Turetsky;A. Kotowska;J. Bubier;N. Dise;P. Crill;E. Hornibrook;K. Minkkinen;T. Moore;I. Myers-Smith
影响因子：
4.8
作者：
Kuiper, Jan J.;Mooij, Wolf M.;Robroek, Bjorn J. M.
通讯作者：
Robroek, Bjorn J. M.
植物功能类型对恢复矿营养泥炭地甲烷动态的影响
影响因子：
4.9
作者：
M. Strack;K. Mwakanyamale;Golnoush Hassanpour Fard;M. Bird;Vicky Bérubé;L. Rochefort
通讯作者：
L. Rochefort