[1084] - Bare fallow management homogenizes spatial variability of organic carbon contents in soil

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Amelung, W., Welp, G., Bornemann, L., Schiedung, H., Herbst, M., 2014. Bare fallow management homogenizes spatial variability of organic carbon contents in soil. Soil Science Society of America Journal, (submitted manuscript), - 1.
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Title(s):Main Title: Bare fallow management homogenizes spatial variability of organic carbon contents in soil
Description(s):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
Creator(s):Principal Investigator: Wulf Amelung
Principal Investigator: Gerd Welp
Author: Ludger Bornemann
Author: Henning Schiedung
Author: Michael Herbst
Contributor(s):Contact Person: Nele Meyer
Publisher:SSSAJ, Madison, USA
TR32 Topic:Soil
Subject(s):CRC/TR32 Keywords: Carbon
File Details
File Name:Meyer_et_al_2014.pdf
Data Type:Text
File Size:940 kB (0.918 MB)
Date(s):Date Submitted: 2014-09-01
Mime Type:application/pdf
Download Permission:OnlyTR32
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
North:-no map data
Measurement Region:Ellebach
Measurement Location:Selhausen
Specific Informations - Publication
Article Type:Journal
Source:Soil Science Society of America Journal
Volume:(submitted manuscript)
Page Range: - 1
Metadata Details
Metadata Creator:Henning Schiedung
Metadata Created:2014-09-19
Metadata Last Updated:2014-09-19
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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