气候变化领域集成服务门户(CCPortal): Limited effect of drainage on peat properties, porewater chemistry, and peat decomposition proxies in a boreal peatland

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DOI	10.1007/s10533-020-00707-1
	Limited effect of drainage on peat properties, porewater chemistry, and peat decomposition proxies in a boreal peatland
	Harris L.I.; Moore T.R.; Roulet N.T.; Pinsonneault A.J.
发表日期	2020
ISSN	0168-2563
起始页码	43
结束页码	62
卷号	151 期号:1
英文摘要	The aim of this study was to determine the effect of drainage on peat properties, porewater chemistry, and peat decomposition proxies in an ombrogenous peatland in the Hudson Bay Lowland (HBL). We anticipated that drainage would change peatland hydrology, vegetation, and biogeochemistry, leading to an increase in peat decomposition. As indicators of peat biogeochemical change and potential proxies for peat decomposition, we compared peat porewater chemistry and in situ nutrient availability of different microforms in a pristine ombrogenous bog, with a bog that has been subject to gradual lowering of the water table by 20 to 80 cm for approximately 7 years prior to, and during, our study. We also examined the chemical composition of peat and peat leachates (organic matter) from Sphagnum and lichen-covered hummocks at each site. Nutrient availability was greater in pools at the drained bog, indicating mineralisation of the dry and bare peat surface. However, our results did not show evidence of significant peat biogeochemical change or advanced decomposition in hummocks at the drained bog, with no difference in nutrient availabilities, peat porewater chemistry, or peat leachate chemistry at the drained and pristine bog. We also found no significant difference in enzyme activity (phenol oxidases) in hummocks at each site, proposed to be an important factor for C loss from peatland ecosystems in drier conditions. Overall, the effects of drainage on peat properties, porewater chemistry, and peat chemical composition at our sites were small and varied for different vegetation-microform types. Although decomposition in drained peatlands is likely constrained by cool temperatures in the HBL, our results suggest that ecohydrological feedbacks at the microform scale may also be important in slowing decomposition in these peatlands. © 2020, Springer Nature Switzerland AG.
英文关键词	Boreal peatlands; Drainage; Ecohydrological feedbacks; Fourier transform infrared FTIR spectroscopy; Hudson Bay Lowland; Humification index; Microtopography; Nutrient availability; Peat leachate chemistry; Phenol oxidases enzyme activity
语种	英语
scopus关键词	biogeochemistry; chemical composition; decomposition; drainage; enzyme activity; nutrient availability; peat; peat soil; peatland; porewater; water chemistry; Canada; Hudson Bay; Sphagnum
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153098
作者单位	Department of Geography, McGill University, Montreal, QC, Canada; Department of Renewable Resources, University of Alberta, Edmonton, AB, Canada; Department of Marine Sciences, Franklin College of Arts and Sciences, University of Georgia, Athens, GA, United States
推荐引用方式 GB/T 7714	Harris L.I.,Moore T.R.,Roulet N.T.,et al. Limited effect of drainage on peat properties, porewater chemistry, and peat decomposition proxies in a boreal peatland[J],2020,151(1).
APA	Harris L.I.,Moore T.R.,Roulet N.T.,&Pinsonneault A.J..(2020).Limited effect of drainage on peat properties, porewater chemistry, and peat decomposition proxies in a boreal peatland.Biogeochemistry,151(1).
MLA	Harris L.I.,et al."Limited effect of drainage on peat properties, porewater chemistry, and peat decomposition proxies in a boreal peatland".Biogeochemistry 151.1(2020).