Defoliation and fertiliser influences on the soil microbial community associated with two contrasting Lolium perenne cullivars

L M Macdonald, E Paterson, L A Dawson, Allan James Stuart McDonald

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The influence of repeated defoliation on soil microbial community (SMC) structure and root turnover was assessed in two contrasting Lolium perenne cultivars (AberDove and S23) grown in fertilised (+F) and non-fertilised (NF) soil. BiOLOG sole carbon source utilisation profiles (SCSUPs) indicated consistently greater potential carbon utilisation in defoliated (+D) compared to non-defoliated (ND) soils regardless of cultivar and fertiliser, and was accounted for in a variety of substrate groups (sugars, carboxylic, amino and phenolic acids). Potential carbon utilisation was also stimulated in +F compared to NF soils, primarily through increased potential utilisation of carboxylic acids. PLFA indicators for the bacterial biomass did not significantly differ between cultivar, soil fertilisation, or defoliation. Defoliated swards grown in fertilised soil (+F+D) had a higher fungal: bacterial ratio and a greater bacterial stress index (cy19:0/18:1 w7c), compared to that of +F ND, NF ND and NF+D, and regardless of cultivar. Overall SMC structure (canonical variate (CV) analysis of PLFAs) discriminated based on cultivar, defoliation and soil fertilisation. Primary discrimination of the SMCs could be related to differences in root density and total plant biomass, and in the case of NF soils, secondary community shifts, evident with defoliation, related to root disappearance over the growing season. Despite the strong common effects of defoliation, and to a lesser extent soil fertilisation, cultivar specific drivers of the soil microbial community were maintained, resulting in consistent, but subtle, discrimination of the SMC associated with the contrasting L. perenne cultivars. (c) 2005 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)674-682
Number of pages9
JournalSoil Biology and Biochemistry
Volume38
Issue number4
DOIs
Publication statusPublished - Apr 2006

Keywords

  • cultivar
  • defoliation
  • grazed ecosystem
  • phospholipid fatty acids
  • root turnover
  • soil microbial community
  • upland grassland
  • root exudation
  • plant
  • ryegrass
  • nitrogen
  • rhizosphere
  • cultivars
  • responses
  • bacteria
  • biomass

Cite this

Defoliation and fertiliser influences on the soil microbial community associated with two contrasting Lolium perenne cullivars. / Macdonald, L M ; Paterson, E ; Dawson, L A ; McDonald, Allan James Stuart.

In: Soil Biology and Biochemistry, Vol. 38, No. 4, 04.2006, p. 674-682.

Research output: Contribution to journalArticle

Macdonald, L M ; Paterson, E ; Dawson, L A ; McDonald, Allan James Stuart. / Defoliation and fertiliser influences on the soil microbial community associated with two contrasting Lolium perenne cullivars. In: Soil Biology and Biochemistry. 2006 ; Vol. 38, No. 4. pp. 674-682.
@article{f96647859b684897a1a37263ee9cb76d,
title = "Defoliation and fertiliser influences on the soil microbial community associated with two contrasting Lolium perenne cullivars",
abstract = "The influence of repeated defoliation on soil microbial community (SMC) structure and root turnover was assessed in two contrasting Lolium perenne cultivars (AberDove and S23) grown in fertilised (+F) and non-fertilised (NF) soil. BiOLOG sole carbon source utilisation profiles (SCSUPs) indicated consistently greater potential carbon utilisation in defoliated (+D) compared to non-defoliated (ND) soils regardless of cultivar and fertiliser, and was accounted for in a variety of substrate groups (sugars, carboxylic, amino and phenolic acids). Potential carbon utilisation was also stimulated in +F compared to NF soils, primarily through increased potential utilisation of carboxylic acids. PLFA indicators for the bacterial biomass did not significantly differ between cultivar, soil fertilisation, or defoliation. Defoliated swards grown in fertilised soil (+F+D) had a higher fungal: bacterial ratio and a greater bacterial stress index (cy19:0/18:1 w7c), compared to that of +F ND, NF ND and NF+D, and regardless of cultivar. Overall SMC structure (canonical variate (CV) analysis of PLFAs) discriminated based on cultivar, defoliation and soil fertilisation. Primary discrimination of the SMCs could be related to differences in root density and total plant biomass, and in the case of NF soils, secondary community shifts, evident with defoliation, related to root disappearance over the growing season. Despite the strong common effects of defoliation, and to a lesser extent soil fertilisation, cultivar specific drivers of the soil microbial community were maintained, resulting in consistent, but subtle, discrimination of the SMC associated with the contrasting L. perenne cultivars. (c) 2005 Elsevier Ltd. All rights reserved.",
keywords = "cultivar, defoliation, grazed ecosystem, phospholipid fatty acids, root turnover, soil microbial community, upland grassland, root exudation, plant, ryegrass, nitrogen, rhizosphere, cultivars, responses, bacteria, biomass",
author = "Macdonald, {L M} and E Paterson and Dawson, {L A} and McDonald, {Allan James Stuart}",
year = "2006",
month = "4",
doi = "10.1016/j.soilbio.2005.06.017",
language = "English",
volume = "38",
pages = "674--682",
journal = "Soil Biology and Biochemistry",
issn = "0038-0717",
publisher = "Elsevier Limited",
number = "4",

}

TY - JOUR

T1 - Defoliation and fertiliser influences on the soil microbial community associated with two contrasting Lolium perenne cullivars

AU - Macdonald, L M

AU - Paterson, E

AU - Dawson, L A

AU - McDonald, Allan James Stuart

PY - 2006/4

Y1 - 2006/4

N2 - The influence of repeated defoliation on soil microbial community (SMC) structure and root turnover was assessed in two contrasting Lolium perenne cultivars (AberDove and S23) grown in fertilised (+F) and non-fertilised (NF) soil. BiOLOG sole carbon source utilisation profiles (SCSUPs) indicated consistently greater potential carbon utilisation in defoliated (+D) compared to non-defoliated (ND) soils regardless of cultivar and fertiliser, and was accounted for in a variety of substrate groups (sugars, carboxylic, amino and phenolic acids). Potential carbon utilisation was also stimulated in +F compared to NF soils, primarily through increased potential utilisation of carboxylic acids. PLFA indicators for the bacterial biomass did not significantly differ between cultivar, soil fertilisation, or defoliation. Defoliated swards grown in fertilised soil (+F+D) had a higher fungal: bacterial ratio and a greater bacterial stress index (cy19:0/18:1 w7c), compared to that of +F ND, NF ND and NF+D, and regardless of cultivar. Overall SMC structure (canonical variate (CV) analysis of PLFAs) discriminated based on cultivar, defoliation and soil fertilisation. Primary discrimination of the SMCs could be related to differences in root density and total plant biomass, and in the case of NF soils, secondary community shifts, evident with defoliation, related to root disappearance over the growing season. Despite the strong common effects of defoliation, and to a lesser extent soil fertilisation, cultivar specific drivers of the soil microbial community were maintained, resulting in consistent, but subtle, discrimination of the SMC associated with the contrasting L. perenne cultivars. (c) 2005 Elsevier Ltd. All rights reserved.

AB - The influence of repeated defoliation on soil microbial community (SMC) structure and root turnover was assessed in two contrasting Lolium perenne cultivars (AberDove and S23) grown in fertilised (+F) and non-fertilised (NF) soil. BiOLOG sole carbon source utilisation profiles (SCSUPs) indicated consistently greater potential carbon utilisation in defoliated (+D) compared to non-defoliated (ND) soils regardless of cultivar and fertiliser, and was accounted for in a variety of substrate groups (sugars, carboxylic, amino and phenolic acids). Potential carbon utilisation was also stimulated in +F compared to NF soils, primarily through increased potential utilisation of carboxylic acids. PLFA indicators for the bacterial biomass did not significantly differ between cultivar, soil fertilisation, or defoliation. Defoliated swards grown in fertilised soil (+F+D) had a higher fungal: bacterial ratio and a greater bacterial stress index (cy19:0/18:1 w7c), compared to that of +F ND, NF ND and NF+D, and regardless of cultivar. Overall SMC structure (canonical variate (CV) analysis of PLFAs) discriminated based on cultivar, defoliation and soil fertilisation. Primary discrimination of the SMCs could be related to differences in root density and total plant biomass, and in the case of NF soils, secondary community shifts, evident with defoliation, related to root disappearance over the growing season. Despite the strong common effects of defoliation, and to a lesser extent soil fertilisation, cultivar specific drivers of the soil microbial community were maintained, resulting in consistent, but subtle, discrimination of the SMC associated with the contrasting L. perenne cultivars. (c) 2005 Elsevier Ltd. All rights reserved.

KW - cultivar

KW - defoliation

KW - grazed ecosystem

KW - phospholipid fatty acids

KW - root turnover

KW - soil microbial community

KW - upland grassland

KW - root exudation

KW - plant

KW - ryegrass

KW - nitrogen

KW - rhizosphere

KW - cultivars

KW - responses

KW - bacteria

KW - biomass

U2 - 10.1016/j.soilbio.2005.06.017

DO - 10.1016/j.soilbio.2005.06.017

M3 - Article

VL - 38

SP - 674

EP - 682

JO - Soil Biology and Biochemistry

JF - Soil Biology and Biochemistry

SN - 0038-0717

IS - 4

ER -