DOI: 10.1111/gcb.13887
Scopus记录号: 2-s2.0-85041302052
论文题名: The origin of soil organic matter controls its composition and bioreactivity across a mesic boreal forest latitudinal gradient
作者: Kohl L. ; Philben M. ; Edwards K.A. ; Podrebarac F.A. ; Warren J. ; Ziegler S.E.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 2 起始页码: e458
结束页码: e473
语种: 英语
英文关键词: bioreactivity
; Boreal forest
; climate change
; moss
; nuclear magnetic resonance
; Soil organic matter
; total hydrolysable amino acids
; vegetation
Scopus关键词: amino acid
; boreal forest
; climate change
; diagenesis
; forest soil
; isotopic composition
; latitudinal gradient
; moss
; nuclear magnetic resonance
; physicochemical property
; soil chemistry
; soil organic matter
; vegetation
; Canada
; Bryophyta
; Tracheophyta
英文摘要: Warmer climates have been associated with reduced bioreactivity of soil organic matter (SOM) typically attributed to increased diagenesis; the combined biological and physiochemical transformation of SOM. In addition, cross-site studies have indicated that ecosystem regime shifts, associated with long-term climate warming, can affect SOM properties through changes in vegetation and plant litter production thereby altering the composition of soil inputs. The relative importance of these two controls, diagenesis and inputs, on SOM properties as ecosystems experience climate warming, however, remains poorly understood. To address this issue we characterized the elemental, chemical (nuclear magnetic resonance spectroscopy and total hydrolysable amino acids analysis), and isotopic composition of plant litter and SOM across a well-constrained mesic boreal forest latitudinal transect in Atlantic Canada. Results across forest sites within each of three climate regions indicated that (1) climate history and diagenesis affect distinct parameters of SOM chemistry, (2) increases in SOM bioreactivity with latitude were associated with elevated proportions of carbohydrates relative to plant waxes and lignin, and (3) despite the common forest type across regions, differences in SOM chemistry by climate region were associated with chemically distinct litter inputs and not different degrees of diagenesis. The observed climate effects on vascular plant litter chemistry, however, explained only part of the regional differences in SOM chemistry, most notably the higher protein content of SOM from warmer regions. Greater proportions of lignin and aliphatic compounds and smaller proportions of carbohydrates in warmer sites' soils were explained by the higher proportion of vascular plant relative to moss litter in the warmer relative to cooler forests. These results indicate that climate change induced decreases in the proportion of moss inputs not only impacts SOM chemistry but also increases the resistance of SOM to decomposition, thus significantly altering SOM cycling in these boreal forest soils. © 2017 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110560
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Earth Sciences, Memorial University, St. John's, NL, Canada; Natural Resources Canada, Canadian Forest Service, Atlantic Forestry Centre, Corner Brook, NL, Canada; Department of Chemical Engineering, University of Toronto, Toronto, ON, Canada; Oak Ridge National Laboratory, Environmental Science Division, Oak Ridge, TN, United States; Natural Resources Canada, Canadian Forest Service, Science Policy Integration Branch, Ottawa, ON, Canada; United States, Department of Agriculture, Natural Resource Conservation Service, Columbus, IN, United States
Recommended Citation:
Kohl L.,Philben M.,Edwards K.A.,et al. The origin of soil organic matter controls its composition and bioreactivity across a mesic boreal forest latitudinal gradient[J]. Global Change Biology,2018-01-01,24(2)