Effect of defoliation on patterns of carbon exudation from Agrostis capillaris

Murray, Phillip; Ostle, Nick; Kenny, Carolyn; Grant, Helen. 2004 Effect of defoliation on patterns of carbon exudation from Agrostis capillaris. Journal of Plant Nutrition and Soil Science, 167 (4). 487-493.

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Grassland ecosystems are important global sinks and sources of atmospheric carbon (C). In this study, we used an in-situ 13CO2 tracer approach to quantify differences in short-term C exudation from defoliated and non-defoliated Agrostis capillaris (L.) plants subjected to natural diurnal light and temperature regimes and rainfall events. Results showed: 1. There was no significant difference in overall carbon exudation from the plants as a result of defoliation; 2. defoliation significantly increased exudation of recent photosynthate (i.e., 13C labeled); 3. there was a distinct and statistically significant diurnal trend in C exudation with root C exudation increasing during the day and early evening and decreasing during the night and early morning. The importance of light/temperature and defoliation as drivers of patterns of root C exudation and the contribution of recent assimilate C to atmosphere-plant-soil carbon flow are discussed.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry > BG01 Measuring and modelling trace gas, aerosol and carbon > BG01.2 Carbon
UKCEH and CEH Sections/Science Areas: _ Environmental Chemistry & Pollution
_ Ecological Processes in Freshwater & Soils
ISSN: 1436-8730
Additional Keywords: carbon, stable isotopes, root exudation, defoliation, Agrostis capillaris
NORA Subject Terms: Agriculture and Soil Science
Biology and Microbiology
Ecology and Environment
Earth Sciences
Date made live: 17 Aug 2009 13:06 +0 (UTC)

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