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 |
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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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Specific Information - Publication
| 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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| Page Visits: | 872 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 1 |
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