Variability in C-14 contents of soil organic matter at the plot and regional scale across climatic and geologic gradients

doi:10.5194/bg-13-3427-2016

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	Variability in C-14 contents of soil organic matter at the plot and regional scale across climatic and geologic gradients
	van der Voort, Tessa Sophia ; Hagedorn, Frank 4; McIntyre, Cameron 3; Zell, Claudia ; Walthert, Lorenz 4; Schleppi, Patrick 4; Feng, Xiaojuan 2; Eglinton, Timothy Ian
刊名	BIOGEOSCIENCES
	2016
卷号	13 期号:11
ISSN号	1726-4170
DOI	10.5194/bg-13-3427-2016
文献子类	Article
英文摘要	Soil organic matter (SOM) forms the largest terrestrial pool of carbon outside of sedimentary rocks. Radiocarbon is a powerful tool for assessing soil organic matter dynamics. However, due to the nature of the measurement, extensive C-14 studies of soil systems remain relatively rare. In particular, information on the extent of spatial and temporal variability in C-14 contents of soils is limited, yet this information is crucial for establishing the range of baseline properties and for detecting potential modifications to the SOM pool. This study describes a comprehensive approach to explore heterogeneity in bulk SOM C-14 in Swiss forest soils that encompass diverse landscapes and climates. We examine spatial variability in soil organic carbon (SOC) C-14, SOC content and C : N ratios over both regional climatic and geologic gradients, on the watershed-and plot-scale and within soil profiles. Results reveal (1) a relatively uniform radiocarbon signal across climatic and geologic gradients in Swiss forest topsoils (0-5 cm, Delta C-14 = 130 +/- 28.6, n = 12 sites), (2) similar radiocarbon trends with soil depth despite dissimilar environmental conditions, and (3) micro-topography dependent, plot-scale variability that is similar in magnitude to regional-scale variability (e.g., Gleysol, 0-5 cm, Delta C-14 126 +/- 35.2, n = 8 adjacent plots of 10 x 10 m). Statistical analyses have additionally shown that Delta C-14 signature in the topsoil is not significantly correlated to climatic parameters (precipitation, elevation, primary production) except mean annual temperature at 0-5 cm. These observations have important consequences for SOM carbon stability modelling assumptions, as well as for the understanding of controls on past and current soil carbon dynamics.
学科主题	Ecology ; Geosciences, Multidisciplinary
电子版国际标准刊号	1726-4189
出版地	GOTTINGEN
WOS关键词	CARBON ; RADIOCARBON ; STABILITY ; TURNOVER ; STORAGE ; DECOMPOSITION ; FUMIGATION ; MECHANISMS ; DELTA-C-13 ; FEEDBACKS
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000379425100015
资助机构	Swiss National Science Foundation (SNF)Swiss National Science Foundation (SNSF) ; National Research Plan 68 Sustainable use of soils as a resource (NRP68) [SNF 406840_143023/11.1.13-31.12.15]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/24574]
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Swiss Fed Inst Technol, Dept Phys, Lab Ion Beam Phys, Otto Stern Weg 5, CH-8093 Zurich, Switzerland 3.Swiss Fed Res Inst WSL, Forest Soils & Biogeochem, Zurcherstr 111, CH-8903 Birmensdorf, Switzerland 4.Swiss Fed Inst Technol, Inst Geol, Sonneggstr 5, CH-8092 Zurich, Switzerland
推荐引用方式 GB/T 7714	van der Voort, Tessa Sophia,Hagedorn, Frank,McIntyre, Cameron,et al. Variability in C-14 contents of soil organic matter at the plot and regional scale across climatic and geologic gradients[J]. BIOGEOSCIENCES,2016,13(11).
APA	van der Voort, Tessa Sophia.,Hagedorn, Frank.,McIntyre, Cameron.,Zell, Claudia.,Walthert, Lorenz.,...&Eglinton, Timothy Ian.(2016).Variability in C-14 contents of soil organic matter at the plot and regional scale across climatic and geologic gradients.BIOGEOSCIENCES,13(11).
MLA	van der Voort, Tessa Sophia,et al."Variability in C-14 contents of soil organic matter at the plot and regional scale across climatic and geologic gradients".BIOGEOSCIENCES 13.11(2016).