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Importance of the local environment on nutrient cycling and litter decomposition in a tall eucalypt forest

Citation

Buettel, JC and Ringwaldt, EM and Hovenden, MJ and Brook, BW, Importance of the local environment on nutrient cycling and litter decomposition in a tall eucalypt forest, Forests, 10, (4) Article 340. ISSN 1999-4907 (2019) [Refereed Article]


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Copyright Statement

Copyright 2019 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.3390/f10040340

Abstract

The relative abundance of nitrogen-fixing species has been hypothesised to influence tree biomass, decomposition, and nitrogen availability in eucalypt forests. This prediction has been demonstrated in experimental settings (two-species mixtures) but is yet to be observed in the field with more realistically complex communities. We used a combination of (a) field measurements of tree-community composition, (b) sampling of soil from a subset of these sites (i.e., the local environment), and (c) a decomposition experiment of forest litter to examine whether there is a local-scale effect of the nitrogen-fixing Acacia dealbata Link (presence and abundance) on nitrogen availability, and whether increases in this essential nutrient led to greater biomass of the canopy tree species, Eucalyptus obliqua L’Hér. Average A. dealbata tree size was a significant predictor of forest basal area in 24 plots (12% deviance explained) and, when combined with average distance between trees, explained 29.1% variance in E. obliqua biomass. However, static patterns of local nitrogen concentration were unrelated to the presence or size of A. dealbata, despite our experiments showing that A. dealbata leaf litter controls decomposition rates in the soil (due to three times higher N). Such results are important for forest management in the context of understanding the timing and turnover of shorter-lived species like acacias, where higher N (through either litter or soil) might be better detected early in community establishment (when growth is faster and intraspecific competition more intense) but with that early signal subsequently dissipated.

Item Details

Item Type:Refereed Article
Keywords:forests, nutrients, disturbance, management, diversity, biomass, forest productivity, community evenness, eucalypt, terrestrial ecology, complementarity
Research Division:Environmental Sciences
Research Group:Ecological Applications
Research Field:Ecosystem Function
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
UTAS Author:Buettel, JC (Dr Jessie Buettel)
UTAS Author:Ringwaldt, EM (Miss Elise Ringwaldt)
UTAS Author:Hovenden, MJ (Associate Professor Mark Hovenden)
UTAS Author:Brook, BW (Professor Barry Brook)
ID Code:132703
Year Published:2019
Deposited By:Plant Science
Deposited On:2019-05-17
Last Modified:2019-06-07
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