Rate of soil-aggregate formation under different organic matter amendments-a short-term incubation experiment

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Rouven Andruschkewitsch
  • Daniel Geisseler
  • Stefan Dultz
  • Rainer Georg Joergensen
  • Bernard Ludwig

Externe Organisationen

  • Universität Kassel
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Seiten (von - bis)297-306
Seitenumfang10
FachzeitschriftJournal of Plant Nutrition and Soil Science
Jahrgang177
Ausgabenummer2
PublikationsstatusVeröffentlicht - Apr. 2014

Abstract

To improve soil structure and take advantage of several accompanying ecological benefits, it is necessary to understand the underlying processes of aggregate dynamics in soils. Our objective was to quantify macroaggregate (> 250 μm) rebuilding in soils from loess (Haplic Luvisol) with different initial soil organic C (SOC) contents and different amendments of organic matter (OM) in a short term incubation experiment. Two soils differing in C content and sampled at 0-5 and 5-25cm soil depths were incubated after macroaggregate destruction. The following treatments were applied: (1) control (without any addition), (2) OM1 (addition of OM: preincubated wheat straw [< 10mm, C : N 40.6] at a rate of 4.1 g C [kg soil]-1), and (3) OM2 (same as (2) at a rate of 8.2 g C [kg soil]-1). Evolution of CO2 released from the treatments was measured continuously, and contents of different water-stable aggregate-size classes (> 250 μm, 250-53 μm, < 53 μm), microbial biomass, and ergosterol were determined after 7 and 28 d of incubation. Highest microbial activity was observed in the first 3 d after the OM application. With one exception, > 50% of the rebuilt macroaggregates were formed within the first 7 d after rewetting and addition of OM. However, the amount of organic C within the new macroaggregates was ≈ 2- to 3-fold higher than in the original soil. The process of aggregate formation was still proceeding after 7 d of incubation, however at a lower rate. Contents of organic C within macroaggregates were decreased markedly after 28 d of incubation in the OM1 and OM2 treatments, suggesting that the microbial biomass (bacteria and fungi) used organic C within the newly built macroaggregates. Overall, the results confirmed for all treatments that macroaggregate formation is a rapid process and highly connected with the amount of OM added and microbial activity. However, the time of maximum aggregation after C addition depends on the soil and substrate investigated. Moreover, the results suggest that the primary macroaggregates, formed within the first 7 d, are still unstable and oversaturated with OM and therefore act as C source for microbial decomposition processes.

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Rate of soil-aggregate formation under different organic matter amendments-a short-term incubation experiment. / Andruschkewitsch, Rouven; Geisseler, Daniel; Dultz, Stefan et al.
in: Journal of Plant Nutrition and Soil Science, Jahrgang 177, Nr. 2, 04.2014, S. 297-306.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Andruschkewitsch R, Geisseler D, Dultz S, Joergensen RG, Ludwig B. Rate of soil-aggregate formation under different organic matter amendments-a short-term incubation experiment. Journal of Plant Nutrition and Soil Science. 2014 Apr;177(2):297-306. doi: 10.1002/jpln.201200628
Andruschkewitsch, Rouven ; Geisseler, Daniel ; Dultz, Stefan et al. / Rate of soil-aggregate formation under different organic matter amendments-a short-term incubation experiment. in: Journal of Plant Nutrition and Soil Science. 2014 ; Jahrgang 177, Nr. 2. S. 297-306.
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title = "Rate of soil-aggregate formation under different organic matter amendments-a short-term incubation experiment",
abstract = "To improve soil structure and take advantage of several accompanying ecological benefits, it is necessary to understand the underlying processes of aggregate dynamics in soils. Our objective was to quantify macroaggregate (> 250 μm) rebuilding in soils from loess (Haplic Luvisol) with different initial soil organic C (SOC) contents and different amendments of organic matter (OM) in a short term incubation experiment. Two soils differing in C content and sampled at 0-5 and 5-25cm soil depths were incubated after macroaggregate destruction. The following treatments were applied: (1) control (without any addition), (2) OM1 (addition of OM: preincubated wheat straw [< 10mm, C : N 40.6] at a rate of 4.1 g C [kg soil]-1), and (3) OM2 (same as (2) at a rate of 8.2 g C [kg soil]-1). Evolution of CO2 released from the treatments was measured continuously, and contents of different water-stable aggregate-size classes (> 250 μm, 250-53 μm, < 53 μm), microbial biomass, and ergosterol were determined after 7 and 28 d of incubation. Highest microbial activity was observed in the first 3 d after the OM application. With one exception, > 50% of the rebuilt macroaggregates were formed within the first 7 d after rewetting and addition of OM. However, the amount of organic C within the new macroaggregates was ≈ 2- to 3-fold higher than in the original soil. The process of aggregate formation was still proceeding after 7 d of incubation, however at a lower rate. Contents of organic C within macroaggregates were decreased markedly after 28 d of incubation in the OM1 and OM2 treatments, suggesting that the microbial biomass (bacteria and fungi) used organic C within the newly built macroaggregates. Overall, the results confirmed for all treatments that macroaggregate formation is a rapid process and highly connected with the amount of OM added and microbial activity. However, the time of maximum aggregation after C addition depends on the soil and substrate investigated. Moreover, the results suggest that the primary macroaggregates, formed within the first 7 d, are still unstable and oversaturated with OM and therefore act as C source for microbial decomposition processes.",
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author = "Rouven Andruschkewitsch and Daniel Geisseler and Stefan Dultz and Joergensen, {Rainer Georg} and Bernard Ludwig",
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Download

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T1 - Rate of soil-aggregate formation under different organic matter amendments-a short-term incubation experiment

AU - Andruschkewitsch, Rouven

AU - Geisseler, Daniel

AU - Dultz, Stefan

AU - Joergensen, Rainer Georg

AU - Ludwig, Bernard

N1 - Copyright: Copyright 2014 Elsevier B.V., All rights reserved.

PY - 2014/4

Y1 - 2014/4

N2 - To improve soil structure and take advantage of several accompanying ecological benefits, it is necessary to understand the underlying processes of aggregate dynamics in soils. Our objective was to quantify macroaggregate (> 250 μm) rebuilding in soils from loess (Haplic Luvisol) with different initial soil organic C (SOC) contents and different amendments of organic matter (OM) in a short term incubation experiment. Two soils differing in C content and sampled at 0-5 and 5-25cm soil depths were incubated after macroaggregate destruction. The following treatments were applied: (1) control (without any addition), (2) OM1 (addition of OM: preincubated wheat straw [< 10mm, C : N 40.6] at a rate of 4.1 g C [kg soil]-1), and (3) OM2 (same as (2) at a rate of 8.2 g C [kg soil]-1). Evolution of CO2 released from the treatments was measured continuously, and contents of different water-stable aggregate-size classes (> 250 μm, 250-53 μm, < 53 μm), microbial biomass, and ergosterol were determined after 7 and 28 d of incubation. Highest microbial activity was observed in the first 3 d after the OM application. With one exception, > 50% of the rebuilt macroaggregates were formed within the first 7 d after rewetting and addition of OM. However, the amount of organic C within the new macroaggregates was ≈ 2- to 3-fold higher than in the original soil. The process of aggregate formation was still proceeding after 7 d of incubation, however at a lower rate. Contents of organic C within macroaggregates were decreased markedly after 28 d of incubation in the OM1 and OM2 treatments, suggesting that the microbial biomass (bacteria and fungi) used organic C within the newly built macroaggregates. Overall, the results confirmed for all treatments that macroaggregate formation is a rapid process and highly connected with the amount of OM added and microbial activity. However, the time of maximum aggregation after C addition depends on the soil and substrate investigated. Moreover, the results suggest that the primary macroaggregates, formed within the first 7 d, are still unstable and oversaturated with OM and therefore act as C source for microbial decomposition processes.

AB - To improve soil structure and take advantage of several accompanying ecological benefits, it is necessary to understand the underlying processes of aggregate dynamics in soils. Our objective was to quantify macroaggregate (> 250 μm) rebuilding in soils from loess (Haplic Luvisol) with different initial soil organic C (SOC) contents and different amendments of organic matter (OM) in a short term incubation experiment. Two soils differing in C content and sampled at 0-5 and 5-25cm soil depths were incubated after macroaggregate destruction. The following treatments were applied: (1) control (without any addition), (2) OM1 (addition of OM: preincubated wheat straw [< 10mm, C : N 40.6] at a rate of 4.1 g C [kg soil]-1), and (3) OM2 (same as (2) at a rate of 8.2 g C [kg soil]-1). Evolution of CO2 released from the treatments was measured continuously, and contents of different water-stable aggregate-size classes (> 250 μm, 250-53 μm, < 53 μm), microbial biomass, and ergosterol were determined after 7 and 28 d of incubation. Highest microbial activity was observed in the first 3 d after the OM application. With one exception, > 50% of the rebuilt macroaggregates were formed within the first 7 d after rewetting and addition of OM. However, the amount of organic C within the new macroaggregates was ≈ 2- to 3-fold higher than in the original soil. The process of aggregate formation was still proceeding after 7 d of incubation, however at a lower rate. Contents of organic C within macroaggregates were decreased markedly after 28 d of incubation in the OM1 and OM2 treatments, suggesting that the microbial biomass (bacteria and fungi) used organic C within the newly built macroaggregates. Overall, the results confirmed for all treatments that macroaggregate formation is a rapid process and highly connected with the amount of OM added and microbial activity. However, the time of maximum aggregation after C addition depends on the soil and substrate investigated. Moreover, the results suggest that the primary macroaggregates, formed within the first 7 d, are still unstable and oversaturated with OM and therefore act as C source for microbial decomposition processes.

KW - Ergosterol

KW - Microbial biomass

KW - Soil respiration

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JF - Journal of Plant Nutrition and Soil Science

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