Strong impacts of belowground tree inputs on soil nematode trophic composition

Aidan M. Keith, Robin William Brooker, Graham H. R. Osler, Stephen J. Chapman, David Francis Robert Philip Burslem, Rene Van Der Wal

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Trees have a key role in determining the composition of soil biota via both above and belowground resource-based mechanisms, and by altering abiotic conditions. We conducted an outdoor mesocosm experiment to investigate the relative impact of above and belowground tree inputs on soil nematode trophic composition, and examine whether tree-driven impacts differed between contrasting species (birch and pine). For both species, we created a factorial design of litter addition and root presence treatments. The litter addition treatment was equivalent to natural levels of litterfall; tree saplings were planted in mesocosms for the root presence treatment and an unplanted control treatment was established that had no litter or root inputs. Litter addition had a limited impact on soil nematode community composition: it primarily decreased omnivore and predatory nematode abundance in birch but had few other effects on the nematode community. By contrast, root presence markedly altered nematode community composition through changes in a range of trophic groups. For both birch and pine, there were significant increases in total, fungivore and predatory nematode abundance in root presence treatments, and furthermore, total and fungivore abundances were positively related to root biomass. Root presence of these contrasting tree species also had a distinctive impact on some specific nematode trophic groups; pine roots promoted bacterivore abundance while birch roots promoted root-hair feeding nematode abundance. These findings suggest strong bottom-up effects of belowground tree inputs, and indicate that particular components of the nematode community may be affected differently by resource quantity and quality. Consequently, we suggest that, in the short-term, belowground rather than aboveground tree inputs have a strong impact on soil food web structure and complexity. (C) 2009 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)1060-1065
Number of pages6
JournalSoil Biology and Biochemistry
Volume41
Issue number6
Early online date28 Feb 2009
DOIs
Publication statusPublished - Jun 2009

Keywords

  • Feeding groups
  • Predators
  • Birch
  • Pine
  • Leaf litter
  • Roots
  • Community structure
  • microbial community structure
  • heather moorland
  • leaf-litter
  • forest
  • carbon
  • fauna
  • nitrogen
  • root
  • respiration
  • vegetation

Cite this

Strong impacts of belowground tree inputs on soil nematode trophic composition. / Keith, Aidan M.; Brooker, Robin William; Osler, Graham H. R.; Chapman, Stephen J.; Burslem, David Francis Robert Philip; Van Der Wal, Rene.

In: Soil Biology and Biochemistry, Vol. 41, No. 6, 06.2009, p. 1060-1065.

Research output: Contribution to journalArticle

Keith, Aidan M. ; Brooker, Robin William ; Osler, Graham H. R. ; Chapman, Stephen J. ; Burslem, David Francis Robert Philip ; Van Der Wal, Rene. / Strong impacts of belowground tree inputs on soil nematode trophic composition. In: Soil Biology and Biochemistry. 2009 ; Vol. 41, No. 6. pp. 1060-1065.
@article{030068c7be024845a61ad2238035a579,
title = "Strong impacts of belowground tree inputs on soil nematode trophic composition",
abstract = "Trees have a key role in determining the composition of soil biota via both above and belowground resource-based mechanisms, and by altering abiotic conditions. We conducted an outdoor mesocosm experiment to investigate the relative impact of above and belowground tree inputs on soil nematode trophic composition, and examine whether tree-driven impacts differed between contrasting species (birch and pine). For both species, we created a factorial design of litter addition and root presence treatments. The litter addition treatment was equivalent to natural levels of litterfall; tree saplings were planted in mesocosms for the root presence treatment and an unplanted control treatment was established that had no litter or root inputs. Litter addition had a limited impact on soil nematode community composition: it primarily decreased omnivore and predatory nematode abundance in birch but had few other effects on the nematode community. By contrast, root presence markedly altered nematode community composition through changes in a range of trophic groups. For both birch and pine, there were significant increases in total, fungivore and predatory nematode abundance in root presence treatments, and furthermore, total and fungivore abundances were positively related to root biomass. Root presence of these contrasting tree species also had a distinctive impact on some specific nematode trophic groups; pine roots promoted bacterivore abundance while birch roots promoted root-hair feeding nematode abundance. These findings suggest strong bottom-up effects of belowground tree inputs, and indicate that particular components of the nematode community may be affected differently by resource quantity and quality. Consequently, we suggest that, in the short-term, belowground rather than aboveground tree inputs have a strong impact on soil food web structure and complexity. (C) 2009 Elsevier Ltd. All rights reserved.",
keywords = "Feeding groups, Predators, Birch, Pine, Leaf litter, Roots, Community structure, microbial community structure, heather moorland, leaf-litter, forest, carbon, fauna, nitrogen, root, respiration, vegetation",
author = "Keith, {Aidan M.} and Brooker, {Robin William} and Osler, {Graham H. R.} and Chapman, {Stephen J.} and Burslem, {David Francis Robert Philip} and {Van Der Wal}, Rene",
year = "2009",
month = "6",
doi = "10.1016/j.soilbio.2009.02.009",
language = "English",
volume = "41",
pages = "1060--1065",
journal = "Soil Biology and Biochemistry",
issn = "0038-0717",
publisher = "Elsevier Limited",
number = "6",

}

TY - JOUR

T1 - Strong impacts of belowground tree inputs on soil nematode trophic composition

AU - Keith, Aidan M.

AU - Brooker, Robin William

AU - Osler, Graham H. R.

AU - Chapman, Stephen J.

AU - Burslem, David Francis Robert Philip

AU - Van Der Wal, Rene

PY - 2009/6

Y1 - 2009/6

N2 - Trees have a key role in determining the composition of soil biota via both above and belowground resource-based mechanisms, and by altering abiotic conditions. We conducted an outdoor mesocosm experiment to investigate the relative impact of above and belowground tree inputs on soil nematode trophic composition, and examine whether tree-driven impacts differed between contrasting species (birch and pine). For both species, we created a factorial design of litter addition and root presence treatments. The litter addition treatment was equivalent to natural levels of litterfall; tree saplings were planted in mesocosms for the root presence treatment and an unplanted control treatment was established that had no litter or root inputs. Litter addition had a limited impact on soil nematode community composition: it primarily decreased omnivore and predatory nematode abundance in birch but had few other effects on the nematode community. By contrast, root presence markedly altered nematode community composition through changes in a range of trophic groups. For both birch and pine, there were significant increases in total, fungivore and predatory nematode abundance in root presence treatments, and furthermore, total and fungivore abundances were positively related to root biomass. Root presence of these contrasting tree species also had a distinctive impact on some specific nematode trophic groups; pine roots promoted bacterivore abundance while birch roots promoted root-hair feeding nematode abundance. These findings suggest strong bottom-up effects of belowground tree inputs, and indicate that particular components of the nematode community may be affected differently by resource quantity and quality. Consequently, we suggest that, in the short-term, belowground rather than aboveground tree inputs have a strong impact on soil food web structure and complexity. (C) 2009 Elsevier Ltd. All rights reserved.

AB - Trees have a key role in determining the composition of soil biota via both above and belowground resource-based mechanisms, and by altering abiotic conditions. We conducted an outdoor mesocosm experiment to investigate the relative impact of above and belowground tree inputs on soil nematode trophic composition, and examine whether tree-driven impacts differed between contrasting species (birch and pine). For both species, we created a factorial design of litter addition and root presence treatments. The litter addition treatment was equivalent to natural levels of litterfall; tree saplings were planted in mesocosms for the root presence treatment and an unplanted control treatment was established that had no litter or root inputs. Litter addition had a limited impact on soil nematode community composition: it primarily decreased omnivore and predatory nematode abundance in birch but had few other effects on the nematode community. By contrast, root presence markedly altered nematode community composition through changes in a range of trophic groups. For both birch and pine, there were significant increases in total, fungivore and predatory nematode abundance in root presence treatments, and furthermore, total and fungivore abundances were positively related to root biomass. Root presence of these contrasting tree species also had a distinctive impact on some specific nematode trophic groups; pine roots promoted bacterivore abundance while birch roots promoted root-hair feeding nematode abundance. These findings suggest strong bottom-up effects of belowground tree inputs, and indicate that particular components of the nematode community may be affected differently by resource quantity and quality. Consequently, we suggest that, in the short-term, belowground rather than aboveground tree inputs have a strong impact on soil food web structure and complexity. (C) 2009 Elsevier Ltd. All rights reserved.

KW - Feeding groups

KW - Predators

KW - Birch

KW - Pine

KW - Leaf litter

KW - Roots

KW - Community structure

KW - microbial community structure

KW - heather moorland

KW - leaf-litter

KW - forest

KW - carbon

KW - fauna

KW - nitrogen

KW - root

KW - respiration

KW - vegetation

U2 - 10.1016/j.soilbio.2009.02.009

DO - 10.1016/j.soilbio.2009.02.009

M3 - Article

VL - 41

SP - 1060

EP - 1065

JO - Soil Biology and Biochemistry

JF - Soil Biology and Biochemistry

SN - 0038-0717

IS - 6

ER -