NDLI: Assessment of ecosystem CO2 efflux and its components in a Pinus canariensis forest at the treeline

Content Provider	Springer Nature Link
Author	Brito, Patricia Jimenez, Maria Soledad Morales, Domingo Wieser, Gerhard
Copyright Year	2013
Abstract	We estimated respiratory fluxes in a treeline-associated Pinus canariensis forest in Tenerife, Canary Islands, an ecotone with strong seasonal changes in soil water availability. CO2 efflux rates from the foliage, above ground woody tissue and the soil were measured by chamber techniques. Site-specific models obtained from these chamber measurements were then combined with half-hourly measurements of canopy, stem and soil temperature as well as with soil water potential, leaf area and stem sapwood volume data for scaling up component-specific CO2 efflux to ecosystem respiration (R ECO). Integrated over an entire year R ECO was 550 g C m−2 ground surface area (average of 2008 and 2009) and comprised the following component fluxes: 57 % from the soil, 10 % from above ground woody tissue and 33 % from the foliage. Between year differences in R ECO and its components were <3 %. R ECO varied markedly throughout an entire year generally following the seasonal trends in temperature during most of the year. During the dry summer, however, R ECO was significantly reduced due to limited soil water availability in the rooting horizon. Thus, in treeline-associated forests under predicted scenarios of increasing aridity in Mediterranean regions, it is likely that there will be a shift in the contribution of CO2 efflux from the soil (R S), the foliage (R F) and above ground woody tissue (R W) to R ECO from predominately below ground to increasingly above ground. Such changes should be taken into account for predicting the response of treeline forests to a changing climate at their upper distribution limit.
Starting Page	999
Ending Page	1009
Page Count	11
File Format	PDF
ISSN	09311890
Journal	Trees
Volume Number	27
Issue Number	4
e-ISSN	14322285
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-02-12
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Respiratory fluxes Mediterranean climate Summer drought Above ground woody tissue Soil Foliage Forestry Plant Sciences Agriculture Plant Anatomy/Development Plant Pathology Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Ecology Physiology Plant Science Forestry

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