globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-013-9928-z
Scopus记录号: 2-s2.0-84896390630
论文题名:
Long-term organic carbon turnover rates in natural and semi-natural topsoils
作者: Mills R.T.E.; Tipping E.; Bryant C.L.; Emmett B.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 118, 期:2018-01-03
起始页码: 257
结束页码: 272
语种: 英语
英文关键词: Carbon ; Modelling ; Radiocarbon ; Soil ; Turnover
Scopus关键词: data set ; forest soil ; fractionation ; heterogeneity ; numerical model ; organic carbon ; radioactivity ; soil management ; soil organic matter ; soil pollution ; topsoil ; United Kingdom
英文摘要: We combined published and new radiocarbon and ancillary data for uncultivated topsoils (typically 15 cm depth), to make two databases, one for the United Kingdom (133 sites), and one global (114 sites). Forest topsoils are significantly higher in radiocarbon than non-forest soils, indicating greater enrichment with "bomb carbon" and therefore faster C turnover, if steady-state conditions are assumed. Steady-state modelling, taking into account variations in atmospheric 14CO2, including the effects of 20th century nuclear weapons testing and radioactive decay, was used to quantify soil carbon turnover rates. Application of a model with variable slow (20 year mean residence time, MRT) and passive (1,000 year MRT) carbon pools partitioned the topsoil C approximately equally, on average, between the two pools when the entire data set was considered. However, the mean slow:passive ratio of 0.65:0.35 for forest soil was highly significantly different (p < 0.001) from the 0.40:0.60 ratio for non-forest soils. Values of the slow and passive fractions were normally distributed, but the non-forest fractions showed greater variation, with approximately twice the relative standard deviations of the forest values. Assuming a litter input of 500 g C m-2 a-1, average global C fluxes (g C m-2 a-1) of forest soils are estimated to be 298 (through a fast pool of MRT 1 year), 200 (slow pool) and 2.0 (passive pool), while for non-forest soils, respective average fluxes of 347, 150 and 3.3 g C m-2 a-1 are obtained. The results highlight the widespread global phenomenon of topsoil C heterogeneity, and indicate key differences between forest and non-forest soils relevant for understanding and managing soil C. © 2013 Springer Science+Business Media Dordrecht.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83600
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Laboratory of Ecological Systems (ECOS), School of Architecture Civil and Environmental Engineering (ENAC), École Polytechnique Fédérale de Lausanne (EPFL), Station 2, 1015 Lausanne, Switzerland; Research Unit Community Ecology, WSL Swiss Federal Institute for Forest, Snow and Landscape Research, Site Lausanne, Station 2, 1015 Lausanne, Switzerland; Centre for Ecology and Hydrology, Lancaster Environment Centre, Lancaster, LA1 4AP, United Kingdom; Natural Environment Research Council Radiocarbon Facility (Environment), East Kilbride, G75 0QF, United Kingdom; Centre for Ecology and Hydrology, Environment Centre Wales, Deiniol Road, Bangor, LL57 2UW, United Kingdom

Recommended Citation:
Mills R.T.E.,Tipping E.,Bryant C.L.,et al. Long-term organic carbon turnover rates in natural and semi-natural topsoils[J]. Biogeochemistry,2014-01-01,118(2018-01-03)
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