Substrate quality effects on stabilized soil carbon reverse with depth

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Externe Organisationen

  • Akademie Věd České Republiky (AV ČR)
  • Charles University
  • University of South Bohemia
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OriginalspracheEnglisch
Aufsatznummer115511
FachzeitschriftGEODERMA
Jahrgang406
Frühes Online-Datum7 Okt. 2021
PublikationsstatusVeröffentlicht - 15 Jan. 2022

Abstract

High-quality plant inputs to the soil with low lignin to nitrogen ratios have been conceptualized to foster the formation of soil organic matter (SOM) and carbon (C) in stabilized soil compartments, such as aggregates and organo-mineral associations (MAOM), in dependence of the soil's capacity to store additional C (i.e., C saturation deficit). Yet, evidence for these conceptualizations from field experiments is scarce and it is unclear whether factors commonly not included in laboratory experiments (such as soil depth) may modulate the influence of substrate quality on SOM formation. We, thus, tested the effect of substrates with different qualities (from European alder and Scots pine) on C stocks in bulk soil, free particulate and aggregate-occluded organic matter, and MAOM in soils at various ages after reclamation and at different soil depths in a common-garden field experiment. Our results revealed that substrate quality generally acted in the predicted way in the upper investigated soil layer (0–5 cm depth), i.e., high-quality substrates increased C stocks in MAOM. Surprisingly, the effect of substrate quality reversed with depth (5–15 cm; i.e., low-quality litters were associated with higher C stocks in MAOM), potentially due to a higher sensitivity (or “priming”) of native SOM in response to high-quality substrates at depth or a lower probability of such substrates reaching deeper soil layers. These patterns appeared to be largely independent of the soils’ theoretical capacity to stabilize additional C, which was exceeded in all investigated soils. Based on the results of our field experiment, we highlight the need to refine recent conceptualizations by focusing on environmental factors that are commonly not accounted for in laboratory-scale experiments and that may alter the direction in which substrate quality acts to influence the formation of SOM.

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Substrate quality effects on stabilized soil carbon reverse with depth. / Li, Mengmeng; Meador, Travis; Sauheitl, Leopold et al.
in: GEODERMA, Jahrgang 406, 115511, 15.01.2022.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Li M, Meador T, Sauheitl L, Guggenberger G, Angst G. Substrate quality effects on stabilized soil carbon reverse with depth. GEODERMA. 2022 Jan 15;406:115511. Epub 2021 Okt 7. doi: 10.1016/j.geoderma.2021.115511
Li, Mengmeng ; Meador, Travis ; Sauheitl, Leopold et al. / Substrate quality effects on stabilized soil carbon reverse with depth. in: GEODERMA. 2022 ; Jahrgang 406.
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title = "Substrate quality effects on stabilized soil carbon reverse with depth",
abstract = "High-quality plant inputs to the soil with low lignin to nitrogen ratios have been conceptualized to foster the formation of soil organic matter (SOM) and carbon (C) in stabilized soil compartments, such as aggregates and organo-mineral associations (MAOM), in dependence of the soil's capacity to store additional C (i.e., C saturation deficit). Yet, evidence for these conceptualizations from field experiments is scarce and it is unclear whether factors commonly not included in laboratory experiments (such as soil depth) may modulate the influence of substrate quality on SOM formation. We, thus, tested the effect of substrates with different qualities (from European alder and Scots pine) on C stocks in bulk soil, free particulate and aggregate-occluded organic matter, and MAOM in soils at various ages after reclamation and at different soil depths in a common-garden field experiment. Our results revealed that substrate quality generally acted in the predicted way in the upper investigated soil layer (0–5 cm depth), i.e., high-quality substrates increased C stocks in MAOM. Surprisingly, the effect of substrate quality reversed with depth (5–15 cm; i.e., low-quality litters were associated with higher C stocks in MAOM), potentially due to a higher sensitivity (or “priming”) of native SOM in response to high-quality substrates at depth or a lower probability of such substrates reaching deeper soil layers. These patterns appeared to be largely independent of the soils{\textquoteright} theoretical capacity to stabilize additional C, which was exceeded in all investigated soils. Based on the results of our field experiment, we highlight the need to refine recent conceptualizations by focusing on environmental factors that are commonly not accounted for in laboratory-scale experiments and that may alter the direction in which substrate quality acts to influence the formation of SOM.",
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author = "Mengmeng Li and Travis Meador and Leopold Sauheitl and Georg Guggenberger and Gerrit Angst",
note = "Funding Information: This research was funded by the Czech Ministry of Education, Youth, and Sports (grant numbers: LM2015075 and EF16_013/0001782 – SoWa Ecosystems Research), and the Czech Science Foundation (grant numbers 19-00533Y, 18-24138S, and 19-17139S). We thank Kate{\v r}ina Lap{\'a}{\v c}kov{\'a}, Hana Turo{\v n}ov{\'a}, Ljubov Pol{\'a}kov{\'a}, and Viola R{\"u}nzi for help in the laboratory and Kevin E. Mueller, Daquan Sun, Ondrej Mudr{\'a}k, and Jan Frouz for discussing some of the data presented in this manuscript. ",
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Download

TY - JOUR

T1 - Substrate quality effects on stabilized soil carbon reverse with depth

AU - Li, Mengmeng

AU - Meador, Travis

AU - Sauheitl, Leopold

AU - Guggenberger, Georg

AU - Angst, Gerrit

N1 - Funding Information: This research was funded by the Czech Ministry of Education, Youth, and Sports (grant numbers: LM2015075 and EF16_013/0001782 – SoWa Ecosystems Research), and the Czech Science Foundation (grant numbers 19-00533Y, 18-24138S, and 19-17139S). We thank Kateřina Lapáčková, Hana Turoňová, Ljubov Poláková, and Viola Rünzi for help in the laboratory and Kevin E. Mueller, Daquan Sun, Ondrej Mudrák, and Jan Frouz for discussing some of the data presented in this manuscript.

PY - 2022/1/15

Y1 - 2022/1/15

N2 - High-quality plant inputs to the soil with low lignin to nitrogen ratios have been conceptualized to foster the formation of soil organic matter (SOM) and carbon (C) in stabilized soil compartments, such as aggregates and organo-mineral associations (MAOM), in dependence of the soil's capacity to store additional C (i.e., C saturation deficit). Yet, evidence for these conceptualizations from field experiments is scarce and it is unclear whether factors commonly not included in laboratory experiments (such as soil depth) may modulate the influence of substrate quality on SOM formation. We, thus, tested the effect of substrates with different qualities (from European alder and Scots pine) on C stocks in bulk soil, free particulate and aggregate-occluded organic matter, and MAOM in soils at various ages after reclamation and at different soil depths in a common-garden field experiment. Our results revealed that substrate quality generally acted in the predicted way in the upper investigated soil layer (0–5 cm depth), i.e., high-quality substrates increased C stocks in MAOM. Surprisingly, the effect of substrate quality reversed with depth (5–15 cm; i.e., low-quality litters were associated with higher C stocks in MAOM), potentially due to a higher sensitivity (or “priming”) of native SOM in response to high-quality substrates at depth or a lower probability of such substrates reaching deeper soil layers. These patterns appeared to be largely independent of the soils’ theoretical capacity to stabilize additional C, which was exceeded in all investigated soils. Based on the results of our field experiment, we highlight the need to refine recent conceptualizations by focusing on environmental factors that are commonly not accounted for in laboratory-scale experiments and that may alter the direction in which substrate quality acts to influence the formation of SOM.

AB - High-quality plant inputs to the soil with low lignin to nitrogen ratios have been conceptualized to foster the formation of soil organic matter (SOM) and carbon (C) in stabilized soil compartments, such as aggregates and organo-mineral associations (MAOM), in dependence of the soil's capacity to store additional C (i.e., C saturation deficit). Yet, evidence for these conceptualizations from field experiments is scarce and it is unclear whether factors commonly not included in laboratory experiments (such as soil depth) may modulate the influence of substrate quality on SOM formation. We, thus, tested the effect of substrates with different qualities (from European alder and Scots pine) on C stocks in bulk soil, free particulate and aggregate-occluded organic matter, and MAOM in soils at various ages after reclamation and at different soil depths in a common-garden field experiment. Our results revealed that substrate quality generally acted in the predicted way in the upper investigated soil layer (0–5 cm depth), i.e., high-quality substrates increased C stocks in MAOM. Surprisingly, the effect of substrate quality reversed with depth (5–15 cm; i.e., low-quality litters were associated with higher C stocks in MAOM), potentially due to a higher sensitivity (or “priming”) of native SOM in response to high-quality substrates at depth or a lower probability of such substrates reaching deeper soil layers. These patterns appeared to be largely independent of the soils’ theoretical capacity to stabilize additional C, which was exceeded in all investigated soils. Based on the results of our field experiment, we highlight the need to refine recent conceptualizations by focusing on environmental factors that are commonly not accounted for in laboratory-scale experiments and that may alter the direction in which substrate quality acts to influence the formation of SOM.

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KW - lignin:N

KW - MAOM

KW - oPOM

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