Tracing N, K, Mg and Ca released from decomposing biomass to new tree growth. Part II: A model system simulating root decomposition on clearfell sites

Weatherall, Andrew, Proe, M.F., Craig, Julie, Cameron, A.D., McKay, H.M. and Midwood, A.J. (2006) Tracing N, K, Mg and Ca released from decomposing biomass to new tree growth. Part II: A model system simulating root decomposition on clearfell sites. Biomass and Bioenergy, 30 (12). pp. 1060-1066. Full text not available from this repository.

Official URL: http://dx.doi.org/10.1016/j.biombioe.2005.12.016

Abstract

The decomposing roots of harvested trees are a potential source of nutrients for new trees on both conventional and whole-tree harvested clearfell sites. Roots contain significant reservoirs of nutrients, but little is known about the magnitude and rate of their release. The aim of this study was to use stable isotope techniques in a model system to trace nutrients released by decomposing roots. Labelled biomass was obtained by growing Sitka spruce (Picea sitchensis (Bong.) Carr.) seedlings with a generous or poor nutrient supply containing elevated 15N, 41K, 26Mg and 44Ca. Labelled trees were re-potted in sand and in two contrasting soils types to remove them from the enriched isotope supply. After re-potting, the labelled above-ground biomass was harvested, removed and used in a separate study described previously (Part I of II). In the study described here (Part II of II), new Sitka spruce seedlings were planted alongside the labelled root systems. A full destructive harvest was undertaken after one growing season. Enriched 15N, 41K, 26Mg, and 44Ca were recovered in the new seedlings in both sand and soils. The elevated amounts of 15N, 41K, 26Mg and 44Ca recovered in new seedlings indicate that nutrients released from decomposing roots can make a direct contribution to the growth of new trees on restock sites. The success of this model system will provide guidance for the application of similar techniques in field experiments.

Item Type: Article
Journal or Publication Title: Biomass and Bioenergy
Publisher: Elsevier Science Limited
ISSN: ISSN: 0961-9534 Online ISSN: 1873-2909
DOI: https://doi.org/10.1016/j.biombioe.2005.12.016
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Departments: Faculty of Health and Science > Science, Natural Resources and Outdoor Studies > Forestry, Conservation & Applied Science
Depositing User: Insight Administrator
Date Deposited: 26 Nov 2010 11:55
Last Modified: 26 Aug 2016 16:08
URI: http://insight.cumbria.ac.uk/id/eprint/656

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