[1767] - Nitrogen and phosphorus supply controls soil organic carbon mineralization in tropical topsoil and subsoil

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Meyer, N., Welp, G., Rodionov, A., Borchard, N., Martius, C., Amelung, W., 2018. Nitrogen and phosphorus supply controls soil organic carbon mineralization in tropical topsoil and subsoil. Soil Biology and Biochemistry, 119, 152 - 161. DOI: 10.1016/j.soilbio.2018.01.024.
Title(s):Main Title: Nitrogen and phosphorus supply controls soil organic carbon mineralization in tropical topsoil and subsoil
Description(s):Abstract: Nitrogen (N) deposition to soils is globally rising, but its effect on soil organic carbon (SOC) turnover is still uncertain. Moreover, common theories of stoichiometric decomposition and microbial N mining predict opposing effects of N supply on SOC turnover. We hypothesized that the effect of N deposition on SOC turnover depends on initial soil nutrient conditions. Thus, we sampled tropical forests and rubber gardens with pronounced gradients of nutrient availability from the topsoil to the deep subsoil (up to 400 cm) and measured substrate-induced respiration (SIR) for 30 days in four treatments (C, CN, CP, CNP additions). A natural 13C abundance approach was conducted to quantify priming effects (PE) of the added C on SOC mineralization. For this purpose we assessed the 13CO2 isotope composition after adding a C4 sugar to the C3 soil; to correct for isotopic fractionation a treatment with C3 sugar additions served as control. We found that nutrient additions to topsoil did neither alter cumulative CO2 release within 30 days (SIRacc) nor PE (PE = 1.6, i.e., sugar additions raised the release of SOC-derived CO2 by a factor of 1.6). In the upper subsoil (30-100 cm), however, both CN and CP additions increased SIRacc (by 239% and 92%, respectively) and the PE (PE = 5.2 and 3.3, respectively) relative to the treatments that received C only (PE = 1.7), while CNP additions revealed the largest increase of SIRacc (267%) and PE (PE = 6.0). In the deep subsoil (>130 cm depth), only the CNP addition consistently increased SIRacc (by 871%) and PE (PE = 5.2) relative to only C additions (PE = 2.0). We conclude that microbial activity was not limited by nutrients in the topsoil but was co-limited by both N and P in the subsoil. The results imply that microbes mine nutrients from previously unavailable pools under the conditions that 1) deficiency actually exists, 2) co-limitation is alleviated, and 3) nutrient reserves are present. Yet, as opposed to microbial nutrient mining theories, we showed that the subsoil PE is highest when nutrient supply matches microbial demand. As a result also N deposition might exert variable effects on SOC turnover in tropical soils: it might have no effect in nutrient-rich topsoils and in co-limited subsoils without P reserves but might increase SOC turnover in co-limited subsoils with potentially acquirable P reserves.
Identifier(s):DOI: 10.1016/j.soilbio.2018.01.024
Responsible Party
Creator(s):Author: Nele Meyer
Author: Gerd Welp
Author: Andrei Rodionov
Author: Nils Borchard
Author: Christopher Martius
Author: Wulf Amelung
TR32 Topic:Soil
Related Sub-project(s):B3
Subject(s):CRC/TR32 Keywords: Soil Respiration, Soil Organic Matter, CO2
File Details
File Name:Meyer_2018_SBB.pdf
Data Type:Text
File Size:639 kB (0.624 MB)
Date(s):Date Accepted: 2018-01-23
Mime Type:application/pdf
Data Format: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.
North:-no map data
Measurement Region:Other
Measurement Location:--Other--
Specific Informations - Publication
Article Type:Journal
Source:Soil Biology and Biochemistry
Number Of Pages:10
Page Range:152 - 161
Metadata Details
Metadata Creator:Nele Meyer
Metadata Created:2018-02-06
Metadata Last Updated:2018-04-04
Funding Phase:3
Metadata Language:English
Metadata Version:V42
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