Author:
Chen Xiaoyong,Eamus Derek,Hutley Lindsay B.
Abstract
Soil CO2 efflux rates were measured in a eucalypt open
forest in a tropical savanna of northern Australia, with a portable closed
chamber and CO2 gas analyser. Both abiotic (soil
temperature and water content) and biotic (litterfall and fine-root growth)
factors that may influence soil CO2 efflux were
examined. Daytime rates of soil CO2 efflux rate were
consistently higher than nocturnal values. Maximal rates occurred during late
afternoons when soil temperatures were also maximal and minimum values were
recorded during the early morning (0400–0800 hours). Average soil
CO2 efflux was 5.37 mol m–2
s–1 (range 3.5–6.7 mol
m–2 s–1 during the wet
season and declined to 2.20 mol m–2
s–1 (range 1.2–3.6 mol
m–2 s–1) during the
dry season. The amount of carbon released from soil was 14.3 t
ha–1 year–1, with
approximately 70% released during the wet season and 30% during
the dry season. The rate of efflux was correlated with soil moisture content
and soil temperature only during the wet season, when root growth and
respiration were high. During the dry season there was no correlation with
soil temperature. These results are discussed in relation to the carbon
balance of tropical savannas.
Subject
Plant Science,Ecology, Evolution, Behavior and Systematics
Cited by
60 articles.
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