Evidence for indirect effects of plant diversity and composition on net nitrification

Daniel C. Laughlin, Stephen C. Hart, Jason P. Kaye, Margaret M Moore

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Abiotic controls on net nitrification rates are well documented, but the potential effects of plants on this important ecosystem process are poorly understood. We evaluated four structural equation models to determine the relative importance of plant community composition, aboveground herbaceous production, and plant species richness on nitrifier abundance and net nitrification following restoration treatments in a ponderosa pine forest. Model selection criteria indicated that species richness was the best predictor of nitrifier abundance, but a model that included community composition effects also had some support in the data. Model results suggest that net nitrification was indirectly related to plant species richness via a positive relationship between species richness and nitrifier abundance. Community composition was indirectly related to nitrifier abundance through its relationship with species richness. Our model indicates that species-rich plant communities dominated by C3 graminoids and legumes are associated with soils that have high abundances of nitrifiers. This study highlights the complexity of deciphering effects of ecological treatments on a system response when multiple interacting factors are simultaneously affected. Our results suggest that plant diversity and composition can both respond to forest thinning, prescribed fire and fuel manipulations, and can be factors that might indirectly influence an ecosystem process such as nitrification. Ecological restoration treatments designed to increase plant diversity and alter community composition may have cascading effects on below-ground processes.

Original languageEnglish (US)
Pages (from-to)435-445
Number of pages11
JournalPlant and Soil
Volume330
Issue number1
DOIs
StatePublished - May 2010

Fingerprint

nitrification
species richness
community composition
species diversity
plant community
plant communities
forest thinning
ecosystems
ecological restoration
ecosystem
Pinus ponderosa
prescribed burning
selection criteria
coniferous forests
thinning
legumes
effect
soil
restoration
plant species

Keywords

  • Biodiversity
  • Ecosystem function
  • Nitrification
  • Nitrogen cycling
  • Nonrecursive model
  • Ponderosa pine forest
  • Productivity
  • Species identity

ASJC Scopus subject areas

  • Soil Science
  • Plant Science

Cite this

Evidence for indirect effects of plant diversity and composition on net nitrification. / Laughlin, Daniel C.; Hart, Stephen C.; Kaye, Jason P.; Moore, Margaret M.

In: Plant and Soil, Vol. 330, No. 1, 05.2010, p. 435-445.

Research output: Contribution to journalArticle

Laughlin, Daniel C. ; Hart, Stephen C. ; Kaye, Jason P. ; Moore, Margaret M. / Evidence for indirect effects of plant diversity and composition on net nitrification. In: Plant and Soil. 2010 ; Vol. 330, No. 1. pp. 435-445.
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