Linking Dissolved Organic Matter to CO2 and CH4 Concentrations in Canadian and Chilean Peatland Pools

被引:18
作者
Hassan, Mahmud [1 ,2 ]
Talbot, Julie [2 ,3 ]
Arsenault, Julien [2 ,3 ]
Martinez-Cruz, Karla [4 ,5 ]
Sepulveda-Jauregui, Armando [4 ]
Hoyos-Santillan, Jorge [4 ,6 ]
Lapierre, Jean-Francois [1 ,2 ]
机构
[1] Univ Montreal, Dept Sci Biol, Montreal, PQ, Canada
[2] Grp Rech Interuniv Limnol GRIL, Montreal, PQ, Canada
[3] Univ Montreal, Dept Geog, Montreal, PQ, Canada
[4] Univ Magallanes, Environm Biogeochem Lab EBL, Punta Arenas, Chile
[5] Univ Konstanz, Limnol Inst, Environm Phys, Constance, Germany
[6] Univ Nottingham, Sch Biosci, Loughborough, England
基金
加拿大自然科学与工程研究理事会;
关键词
peatland pools; climate; vegetation cover; morphometry; dissolved organic matter; greenhouse gases; CARBON-DIOXIDE; STREAM WATER; METHANE; FLUORESCENCE; LAKES; SUPERSATURATION; PONDS; ENVIRONMENTS; TEMPERATURE; CHEMISTRY;
D O I
10.1029/2023GB007715
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Peatland open-water pools can be net carbon (C) emitters within heterogeneous peatland ecosystems that are generally net C sinks. However, the intra- and inter-regional patterns and drivers of CO2 and CH4 production, as well as their link with dissolved organic matter (DOM) quality and quantity, remain poorly understood. We analyzed a range of optical characteristics and chemical variables controlling DOM and CO2 and CH4 concentrations in peatland pools across two regions with contrasting geographical properties (i.e., climate, topography, morphometry, and vegetation cover) of eastern Canada and Chilean Patagonia. We found inter-regional patterns in CO2, CH4 and DOM concentrations and composition that were coherent with patterns in mean annual temperature and precipitation, and vegetation cover. Cross-regional patterns of CO2 and CH4 were driven by morphometry, vegetation cover, and protein-like DOM composition, a proxy of high biological activity, whereas temporal variations of CO2 and CH4 concentrations were further influenced by seasonal changes in humic-like DOM composition, dissolved organic carbon and nutrients (i.e., total phosphorus and total nitrogen) concentrations, as well as pH and oxygen levels. Our results suggest that geophysical constraints associated with local peat and pool characteristics as well as climate patterns are major drivers of DOM and greenhouse gases concentrations and the links between them in broadly distributed peatland pools.
引用
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页数:15
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