NDLI: Seasonal dynamics of soil carbon dioxide efflux and simulated rhizosphere respiration in a beech forest.

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Seasonal dynamics of soil carbon dioxide efflux and simulated rhizosphere respiration in a beech forest.

Content Provider	Semantic Scholar
Author	Epron, Daniel Dantec, Valérie Le Dufrene, Eric Granier, André
Copyright Year	2001
Abstract	Respiration of the rhizosphere in a beech (Fagus sylvatica L.) forest was calculated by subtracting microbial respiration associated with organic matter decomposition from daily mean soil CO2 efflux. We used a semi-mechanistic soil organic matter model to simulate microbial respiration, which was validated against "no roots" data from trenched subplots. Rhizosphere respiration exhibited pronounced seasonal variation from 0.2 g C m(-2) day(-1) in January to 2.3 g C m(-2) day(-1) in July. Rhizosphere respiration accounted for 30 to 60% of total soil CO2 efflux, with an annual mean of 52%. The high Q10 (3.9) for in situ rhizosphere respiration was ascribed to the confounding effects of temperature and changes in root biomass and root and shoot activities. When data were normalized to the same soil temperature based on a physiologically relevant Q10 value of 2.2, the lowest values of temperature-normalized rhizosphere respiration were observed from January to March, whereas the highest value was observed in early July when fine root growth is thought to be maximal.
Starting Page	5032
Ending Page	5035
Page Count	4
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/treephys/21/2-3/10.1093/treephys/21.2-3.145/2/21-2-3-145.pdf?Expires=1492216264&Key-Pair-Id=APKAIUCZBIA4LVPAVW3Q&Signature=XVCNVxE3bf2~2fIQ5U5gS06KLlT2rWsWYP-azcVlHlXxzyXRAv-Ar5lUR50xjhIhaMpglw6XO6KgGvJNr6SJ9bP-CjDNIjXG3dHNUB~1Tg2fD~kWuTSIO9C5j3ZKFSZoxopFAez43qsnTLAbpkkaGsGP6EwChv9Uc9ljK2rIzeySN53wb5BWdB3zGFoN3Qz1vYVCnV9Q1vL1kyluoiHwxWfjYoox7llIFWo0CMohMPIlZGK1-wHJttLxQbnfi7kpTipk~IXW24hNEnFcjvwzRPLSn9oyPZi51J2fplz3fN5eQVcHVoz-mMK63RHZPCEAIZ9nFzXE1SIIF2~hl5LTyw__
PubMed reference number	11303645v1
Volume Number	21
Issue Number	2-3
Journal	Tree physiology
Language	English
Access Restriction	Open
Subject Keyword	Biomass Carbon Dioxide Cell Respiration Fagus sylvatica Plant Roots Rhizosphere
Content Type	Text
Resource Type	Article

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