Carbon saturation drives spatial patterns of soil organic matter losses under long-term bare fallow

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Title:Main Title: Carbon saturation drives spatial patterns of soil organic matter losses under long-term bare fallow
Description:Abstract: Spatial controls of soil organic carbon (SOC) turnover are not well understood. We hypothesized that spatial patterns of SOC turnover are related to carbon (C) saturation rather than to the size of measurable SOC-pools such as particulate organic matter (POM), determined as SOC in particle-size fractions. Therefore, we repeatedly grid-sampled a field after one, three, seven, and eleven years under bare fallow management, which revealed a spatial gradient from high to low degrees of C saturation. We measured the contents of SOC and the contents of SOC in coarse sand-size (2000-250 µm, POM1), fine sand-size (250-53 µm, POM2), silt-size (53-20 µm, POM3), and fine silt to clay-size fractions (nonPOM, < 20 µm), calculated the degree of C saturation from textural properties and nonPOM contents, and related these parameters to SOC losses. In the first year of bare fallow, the soil contained on average 12.1 g SOC kg-1, of which 0.6 g kg-1, 1.7 g kg-1, and 2.1 g kg-1 were lost after three, seven, and eleven years of bare fallow, respectively. The SOC losses within eleven years were spatially variable and varied between 1 % and 46 % relative to the initial SOC content. In support of our hypothesis, SOC losses were largest at subsites with largest degrees of C saturation (R² = 0.82). Although the POM fractions declined most drastically, they only comprised 4 to 9 % of bulk SOC, and they did neither correlate with nor explain spatial patterns of SOC losses. We conclude that the concept of C saturation is superior to conventional physical fractionation approaches for predicting spatio-temporal patterns of SOC turnover at sites with a high degree of C saturation.
Identifier:10.1016/j.geoderma.2017.07.004 (DOI)
Responsible Party
Creators:Nele Meyer (Author), Ludger Bornemann (Author), Gerd Welp (Author), Henning Schiedung (Author), Michael Herbst (Author), Wulf Amelung (Author)
Publisher:Elsevier
Publication Year:2017
Topic
TR32 Topic:Soil
Related Subprojects:B3, B1
Subjects:Keywords: Soil, Soil Organic Matter, soil Heterogeneity
File Details
Filename:Meyer_2017_Geoderma.pdf
Data Type:Text - Article
File Size:1.1 MB
Date:Accepted: 08.07.2017
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Project Members
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:[TR32DB] Data policy agreement
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Publication Status:Accepted
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Geoderma
Volume:306
Number of Pages:10 (89 - 98)
Metadata Details
Metadata Creator:Nele Meyer
Metadata Created:22.07.2017
Metadata Last Updated:22.07.2017
Subproject:B3
Funding Phase:3
Metadata Language:English
Metadata Version:V50
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