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. 10.1002/jpln.200320371Full text not available from this repository.
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.
|Programmes:||CEH Programmes pre-2009 publications > Biogeochemistry > BG01 Measuring and modelling trace gas, aerosol and carbon > BG01.2 Carbon|
|CEH Sections:||_ Environmental Chemistry & Pollution
_ Ecological Processes in Freshwater & Soils
|Additional Keywords:||carbon, stable isotopes, root exudation, defoliation, Agrostis capillaris|
|NORA Subject Terms:||Agriculture and Soil Science
Biology and Microbiology
Ecology and Environment
|Date made live:||17 Aug 2009 13:06|
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