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Increases in soil aggregation following phosphorus additions in a tropical premontane forest are not driven by root and arbuscular mycorrhizal fungal abundances

Camenzind, Tessa ; Papathanasiou, Helena J. ; Förster, Antje ; Dietrich, Karla ; Hertel, Dietrich ; Homeier, Jürgen ; Oelmann, Yvonne ; Olsson, Pål A. LU ; Suárez, Juan P. and Rillig, Matthias C. (2016) In Frontiers in Earth Science 3.
Abstract

Tropical ecosystems have an important role in global change scenarios, in part because they serve as a large terrestrial carbon pool. Carbon protection is mediated by soil aggregation processes, whereby biotic and abiotic factors influence the formation and stability of aggregates. Nutrient additions may affect soil structure indirectly by simultaneous shifts in biotic factors, mainly roots, and fungal hyphae, but also via impacts on abiotic soil properties. Here, we tested the hypothesis that soil aggregation will be affected by nutrient additions primarily via changes in arbuscular mycorrhizal fungal (AMF) hyphae and root length in a pristine tropical forest system. Therefore, the percentage of water-stable macroaggregates (> 250... (More)

Tropical ecosystems have an important role in global change scenarios, in part because they serve as a large terrestrial carbon pool. Carbon protection is mediated by soil aggregation processes, whereby biotic and abiotic factors influence the formation and stability of aggregates. Nutrient additions may affect soil structure indirectly by simultaneous shifts in biotic factors, mainly roots, and fungal hyphae, but also via impacts on abiotic soil properties. Here, we tested the hypothesis that soil aggregation will be affected by nutrient additions primarily via changes in arbuscular mycorrhizal fungal (AMF) hyphae and root length in a pristine tropical forest system. Therefore, the percentage of water-stable macroaggregates (> 250 µm) (WSA) and the soil mean weight diameter (MWD) was analyzed, as well as nutrient contents, pH, root length, and AMF abundance. Phosphorus additions significantly increased the amount of WSA, which was consistent across two different sampling times. Despite a positive effect of phosphorus additions on extra-radical AMF biomass, no relationship between WSA and extra-radical AMF nor roots was revealed by regression analyses, contrary to the proposed hypothesis. These findings emphasize the importance of analyzing soil structure in understudied tropical systems, since it might be affected by increasing nutrient deposition expected in the future.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Arbuscular mycorrhizal fungi, Ecuador, Fertilization, Global change, Soil aggregation, Tropical forest
in
Frontiers in Earth Science
volume
3
article number
89
pages
10 pages
publisher
Frontiers Media S. A.
external identifiers
  • scopus:84962684897
ISSN
2296-6463
DOI
10.3389/feart.2015.00089
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2016 Camenzind, Papathanasiou, Förster, Dietrich, Hertel, Homeier, Oelmann, Olsson, Suárez and Rillig.
id
06d0c19e-df33-4863-9778-b06dada16bde
date added to LUP
2024-04-27 11:02:32
date last changed
2024-05-13 14:55:28
@article{06d0c19e-df33-4863-9778-b06dada16bde,
  abstract     = {{<p>Tropical ecosystems have an important role in global change scenarios, in part because they serve as a large terrestrial carbon pool. Carbon protection is mediated by soil aggregation processes, whereby biotic and abiotic factors influence the formation and stability of aggregates. Nutrient additions may affect soil structure indirectly by simultaneous shifts in biotic factors, mainly roots, and fungal hyphae, but also via impacts on abiotic soil properties. Here, we tested the hypothesis that soil aggregation will be affected by nutrient additions primarily via changes in arbuscular mycorrhizal fungal (AMF) hyphae and root length in a pristine tropical forest system. Therefore, the percentage of water-stable macroaggregates (&gt; 250 µm) (WSA) and the soil mean weight diameter (MWD) was analyzed, as well as nutrient contents, pH, root length, and AMF abundance. Phosphorus additions significantly increased the amount of WSA, which was consistent across two different sampling times. Despite a positive effect of phosphorus additions on extra-radical AMF biomass, no relationship between WSA and extra-radical AMF nor roots was revealed by regression analyses, contrary to the proposed hypothesis. These findings emphasize the importance of analyzing soil structure in understudied tropical systems, since it might be affected by increasing nutrient deposition expected in the future.</p>}},
  author       = {{Camenzind, Tessa and Papathanasiou, Helena J. and Förster, Antje and Dietrich, Karla and Hertel, Dietrich and Homeier, Jürgen and Oelmann, Yvonne and Olsson, Pål A. and Suárez, Juan P. and Rillig, Matthias C.}},
  issn         = {{2296-6463}},
  keywords     = {{Arbuscular mycorrhizal fungi; Ecuador; Fertilization; Global change; Soil aggregation; Tropical forest}},
  language     = {{eng}},
  publisher    = {{Frontiers Media S. A.}},
  series       = {{Frontiers in Earth Science}},
  title        = {{Increases in soil aggregation following phosphorus additions in a tropical premontane forest are not driven by root and arbuscular mycorrhizal fungal abundances}},
  url          = {{http://dx.doi.org/10.3389/feart.2015.00089}},
  doi          = {{10.3389/feart.2015.00089}},
  volume       = {{3}},
  year         = {{2016}},
}