Bare fallow management homogenizes spatial variability of organic carbon contents in soil

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Title:Main Title: Bare fallow management homogenizes spatial variability of organic carbon contents in soil
Description:Abstract: Bare fallow usually results in a loss of labile soil organic carbon (SOC) pools. Here we hypothesized that the absence of growing crops results in a homogenization of the spatial patterns of SOC contents by decomposition of labile fractions. To test this hypothesis, and to identify factors that control SOC losses over time, we grid-sampled an Ap horizon after 1, 3, and 7 years of fallow management with known spatial heterogeneity of inorganic site properties (texture, Fe oxides, proportions of rock fragments). We assessed the contents of SOC, and particulate organic matter (POM1: 2000-250µm, POM2: 250-53µm, POM3: 53-20µm) and nonPOM (<20 µm), and related these properties to SOC loss. On average, the surface soil lost 2.2 g SOC kg fine earth-1, corresponding to 17.5% of the initial SOC content. Intriguingly, large parts of the SOC loss were attributed to the nonPOM fraction (82% of SOC loss). The decline of POM fractions was less prominent, i.e., contrasting our hypothesis, changes in the SOC pattern were mainly due to changes in mineral-associated C. Notably, SOC losses from the fine earth were highest at subsites with high SOC contents in the fine earth (i.e., at subsites with highest proportions of rock fragments and sand), and lowest at subsites with low overall SOC contents (i.e. at subsites with small proportions of rock fragments and sand) (R2 = 0.64***). As a result, the spatial variability of SOC contents homogenized with prolonged fallow management, probably because decomposition of SOC was enhanced at subsites with high initial carbon saturation from former arable land use.
Responsible Party
Creators:Wulf Amelung (Principal Investigator), Gerd Welp (Principal Investigator), Ludger Bornemann (Author), Henning Schiedung (Author), Michael Herbst (Author)
Contributor:Nele Meyer (Contact Person)
Publisher:SSSAJ, Madison, USA
Publication Year:2014
Topic
TR32 Topic:Soil
Related Subproject:B3
Subject:Keyword: Carbon
File Details
Filename:Meyer_et_al_2014.pdf
Data Type:Text - Article
File Size:940 KB
Date:Submitted: 01.09.2014
Mime Type:application/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:Submitted
Review Status:Not peer reviewed
Publication Type:Article
Article Type:Journal
Source:Soil Science Society of America Journal
Volume:(submitted manuscript)
Number of Pages: ( - 1)
Metadata Details
Metadata Creator:Henning Schiedung
Metadata Created:19.09.2014
Metadata Last Updated:19.09.2014
Subproject:B3
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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