DOI: 10.1029/2017JG003996
Scopus记录号: 2-s2.0-85049831175
论文题名: Thermodynamic Control of the Carbon Budget of a Peatland
作者: Worrall F. ; Moody C.S. ; Clay G.D. ; Burt T.P. ; Kettridge N. ; Rose R.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 6 起始页码: 1863
结束页码: 1878
语种: 英语
英文关键词: CH4
; CO2
; DOC
; oxidation
; peatlands
Scopus关键词: biomass
; carbon budget
; carbon dioxide
; catchment
; dissolved organic carbon
; dissolved organic matter
; Gibbs free energy
; methane
; oxidation
; particulate matter
; peatland
; soil organic matter
; thermodynamics
; Cumbria
; England
; Moor House National Nature Reserve
; Pennines
; United Kingdom
; Bryophyta
; Calluna
; Carex
英文摘要: The transformations and transitions of organic matter into, through, and out of an ecosystem must obey the second law of thermodynamics. This study considered the transition in the solid components of the organic matter flux through an entire ecosystem. Organic matter samples were taken from each organic matter reservoir and fluvial transfer pathway in a 100% peat-covered catchment (Moor House National Nature Reserve, North Pennines, UK) and were analyzed by elemental analysis and bomb calorimetry. The samples analyzed were as follows: bulk aboveground and belowground biomass; individual plant functional types (heather, mosses, and sedges); plant litter layer; peat soil; and samples of particulate and dissolved organic matter (POM and DOM). Samples were compared to standards of lignin, cellulose, and plant protein. It was possible to calculate: enthalpy of formation ((Formula presented.)); entropy of formation ((Formula presented.)); and Gibbs free energy of formation ((Formula presented.)) for each of the samples and standards. The increase (decreasing negative values) in (Formula presented.) through the ecosystem mean that for all but litter production, the transformations through the system must be balanced by production of low (large negative values) (Formula presented.) products, not only CO2 or CH4 but also DOM. The change in (Formula presented.) down the peat profile shows that reaction of the soil organic matter decreases or even ceases at depth and the majority of the reaction has occurred above 40 cm below the surface. This approach represents a new objective way to test and trace organic matter transformations in and through an ecosystem. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113809
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Earth Sciences, Durham University, Durham, United Kingdom; Geography, School of Environment, Education and Development, University of Manchester, Manchester, United Kingdom; Department of Geography, Durham University, Durham, United Kingdom; School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, United Kingdom; Centre for Ecology and Hydrology, Lancaster Environment Centre, Lancaster, United Kingdom
Recommended Citation:
Worrall F.,Moody C.S.,Clay G.D.,et al. Thermodynamic Control of the Carbon Budget of a Peatland[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(6)