Positive feedback loop between earthworms, humus form and soil pH reinforces earthworm abundance in European forests

In many terrestrial ecosystems, earthworms operate at the interface between plants and soil. As ecosystem engineers, they affect key ecosystem functions such as decomposition, nutrient cycling and bioturbation. Their incidence and abundance depends on several soil properties, yet simultaneously they...

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Veröffentlicht in:Functional ecology Jg. 34; H. 12; S. 2598 - 2610
Hauptverfasser: Desie, Ellen, Van Meerbeek, Koenraad, De Wandeler, Hans, Bruelheide, Helge, Domisch, Timo, Jaroszewicz, Bogdan, Joly, François‐Xavier, Vancampenhout, Karen, Vesterdal, Lars, Muys, Bart, Briones, Maria
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Sprache:Englisch
Veröffentlicht: London Wiley Subscription Services, Inc 01.12.2020
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ISSN:0269-8463, 1365-2435
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Abstract In many terrestrial ecosystems, earthworms operate at the interface between plants and soil. As ecosystem engineers, they affect key ecosystem functions such as decomposition, nutrient cycling and bioturbation. Their incidence and abundance depends on several soil properties, yet simultaneously they also impact soil properties themselves. The existence of a positive feedback loop in which earthworm activity maintains their own niche—by promoting turnover rate in the forest floor, thereby increasing topsoil pH and creating suitable living conditions for themselves—has been suggested before, yet lacks supporting evidence. Here we assessed how tree species litter traits relate to such below‐ground interactions in forests across Europe. Specifically, we hypothesized a below‐ground feedback loop between burrowing earthworm biomass, humus form and pH, affected by litter quality. We tested this hypothesis by means of structural equation modelling. Our results demonstrate that litter nutrient concentrations affect both burrowing and litter dwelling earthworm biomass, which in turn directly impacts humus form and indirectly soil pH. At a continental scale, that is, including all edaphic conditions, soil pH did not feed into earthworm biomass nor could we link leaf structural recalcitrance (e.g. lignin) or functional diversity to below‐ground interactions. However, in forests where moisture is not limiting, soil acidity proved an important factor determining the context of below‐ground interactions. Therefore, we were able to confirm the hypothesized feedback loop for forest ecosystems with soil pH ≤ 5. In calcareous and/or periodically dry forests, other factors than soil chemistry and litter quality became determinant for earthworm biomass. The activity of burrowing earthworms is pivotal in below‐ground ecosystem functioning of mesic forest soils, impacting litter accumulation and forest floor conditions above‐ground, the pH and nutrient status below‐ground and ultimately their own living conditions. This highlights earthworm bioturbation as a key mechanism for understanding plant–soil interactions in forests. A free Plain Language Summary can be found within the Supporting Information of this article. A free Plain Language Summary can be found within the Supporting Information of this article.
AbstractList In many terrestrial ecosystems, earthworms operate at the interface between plants and soil. As ecosystem engineers, they affect key ecosystem functions such as decomposition, nutrient cycling and bioturbation. Their incidence and abundance depends on several soil properties, yet simultaneously they also impact soil properties themselves. The existence of a positive feedback loop in which earthworm activity maintains their own niche—by promoting turnover rate in the forest floor, thereby increasing topsoil pH and creating suitable living conditions for themselves—has been suggested before, yet lacks supporting evidence. Here we assessed how tree species litter traits relate to such below‐ground interactions in forests across Europe. Specifically, we hypothesized a below‐ground feedback loop between burrowing earthworm biomass, humus form and pH, affected by litter quality. We tested this hypothesis by means of structural equation modelling. Our results demonstrate that litter nutrient concentrations affect both burrowing and litter dwelling earthworm biomass, which in turn directly impacts humus form and indirectly soil pH. At a continental scale, that is, including all edaphic conditions, soil pH did not feed into earthworm biomass nor could we link leaf structural recalcitrance (e.g. lignin) or functional diversity to below‐ground interactions. However, in forests where moisture is not limiting, soil acidity proved an important factor determining the context of below‐ground interactions. Therefore, we were able to confirm the hypothesized feedback loop for forest ecosystems with soil pH ≤ 5. In calcareous and/or periodically dry forests, other factors than soil chemistry and litter quality became determinant for earthworm biomass. The activity of burrowing earthworms is pivotal in below‐ground ecosystem functioning of mesic forest soils, impacting litter accumulation and forest floor conditions above‐ground, the pH and nutrient status below‐ground and ultimately their own living conditions. This highlights earthworm bioturbation as a key mechanism for understanding plant–soil interactions in forests. A free Plain Language Summary can be found within the Supporting Information of this article. A free Plain Language Summary can be found within the Supporting Information of this article.
In many terrestrial ecosystems, earthworms operate at the interface between plants and soil. As ecosystem engineers, they affect key ecosystem functions such as decomposition, nutrient cycling and bioturbation. Their incidence and abundance depends on several soil properties, yet simultaneously they also impact soil properties themselves. The existence of a positive feedback loop in which earthworm activity maintains their own niche—by promoting turnover rate in the forest floor, thereby increasing topsoil pH and creating suitable living conditions for themselves—has been suggested before, yet lacks supporting evidence.Here we assessed how tree species litter traits relate to such below‐ground interactions in forests across Europe. Specifically, we hypothesized a below‐ground feedback loop between burrowing earthworm biomass, humus form and pH, affected by litter quality. We tested this hypothesis by means of structural equation modelling.Our results demonstrate that litter nutrient concentrations affect both burrowing and litter dwelling earthworm biomass, which in turn directly impacts humus form and indirectly soil pH. At a continental scale, that is, including all edaphic conditions, soil pH did not feed into earthworm biomass nor could we link leaf structural recalcitrance (e.g. lignin) or functional diversity to below‐ground interactions.However, in forests where moisture is not limiting, soil acidity proved an important factor determining the context of below‐ground interactions. Therefore, we were able to confirm the hypothesized feedback loop for forest ecosystems with soil pH ≤ 5. In calcareous and/or periodically dry forests, other factors than soil chemistry and litter quality became determinant for earthworm biomass.The activity of burrowing earthworms is pivotal in below‐ground ecosystem functioning of mesic forest soils, impacting litter accumulation and forest floor conditions above‐ground, the pH and nutrient status below‐ground and ultimately their own living conditions. This highlights earthworm bioturbation as a key mechanism for understanding plant–soil interactions in forests.A free Plain Language Summary can be found within the Supporting Information of this article.
In many terrestrial ecosystems, earthworms operate at the interface between plants and soil. As ecosystem engineers, they affect key ecosystem functions such as decomposition, nutrient cycling and bioturbation. Their incidence and abundance depends on several soil properties, yet simultaneously they also impact soil properties themselves. The existence of a positive feedback loop in which earthworm activity maintains their own niche—by promoting turnover rate in the forest floor, thereby increasing topsoil pH and creating suitable living conditions for themselves—has been suggested before, yet lacks supporting evidence. Here we assessed how tree species litter traits relate to such below‐ground interactions in forests across Europe. Specifically, we hypothesized a below‐ground feedback loop between burrowing earthworm biomass, humus form and pH, affected by litter quality. We tested this hypothesis by means of structural equation modelling. Our results demonstrate that litter nutrient concentrations affect both burrowing and litter dwelling earthworm biomass, which in turn directly impacts humus form and indirectly soil pH. At a continental scale, that is, including all edaphic conditions, soil pH did not feed into earthworm biomass nor could we link leaf structural recalcitrance (e.g. lignin) or functional diversity to below‐ground interactions. However, in forests where moisture is not limiting, soil acidity proved an important factor determining the context of below‐ground interactions. Therefore, we were able to confirm the hypothesized feedback loop for forest ecosystems with soil pH ≤ 5. In calcareous and/or periodically dry forests, other factors than soil chemistry and litter quality became determinant for earthworm biomass. The activity of burrowing earthworms is pivotal in below‐ground ecosystem functioning of mesic forest soils, impacting litter accumulation and forest floor conditions above‐ground, the pH and nutrient status below‐ground and ultimately their own living conditions. This highlights earthworm bioturbation as a key mechanism for understanding plant–soil interactions in forests. A free Plain Language Summary can be found within the Supporting Information of this article.
Author Desie, Ellen
Bruelheide, Helge
Domisch, Timo
Van Meerbeek, Koenraad
Jaroszewicz, Bogdan
Vancampenhout, Karen
Vesterdal, Lars
Briones, Maria
Muys, Bart
De Wandeler, Hans
Joly, François‐Xavier
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  organization: University of Stirling
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  surname: Vancampenhout
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  organization: KU Leuven
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  givenname: Maria
  surname: Briones
  fullname: Briones, Maria
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Snippet In many terrestrial ecosystems, earthworms operate at the interface between plants and soil. As ecosystem engineers, they affect key ecosystem functions such...
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SubjectTerms Abundance
Acidity
biogeochemical cycles
Biomass
Bioturbation
burrowing
Calcareous soils
Decomposing organic matter
degradation
Dry forests
earthworm
earthworms
Ecological function
ecosystem engineer
ecosystem engineers
edaphic factors
Europe
Feedback
Feedback loops
Floors
Forest ecosystems
Forest floor
forest litter
Forest soils
Forests
functional diversity
Humus
incidence
information
leaves
Lignin
Litter
litter quality
Living conditions
Multivariate statistical analysis
Niches
Nutrient concentrations
nutrient content
Nutrient cycles
Nutrient status
Oligochaeta
pH effects
Plant species
plant–soil interaction
Positive feedback
Soil chemistry
Soil conditions
Soil moisture
Soil pH
soil process domain
Soil properties
soil-plant interactions
Soils
structural equation modeling
Terrestrial ecosystems
Topsoil
tree species diversity
tree species identity
trees
Turnover rate
Worms
Title Positive feedback loop between earthworms, humus form and soil pH reinforces earthworm abundance in European forests
URI https://onlinelibrary.wiley.com/doi/abs/10.1111%2F1365-2435.13668
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Volume 34
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