NDLI: Increased water use efficiency does not prevent growth decline of Pinus canariensis in a semi-arid treeline ecotone in Tenerife, Canary Islands (Spain)

Content Provider	Springer Nature Link
Author	Brito, Patricia Grams, Thorsten E. E. Matysssek, Rainer Jimenez, Maria S. Gonzalez Rodríguez, Agueda M. Oberhuber, Walter Wieser, Gerhard
Copyright Year	2016
Abstract	Intrinsic water use efficiency of Pinus canariensis (Sweet ex Spreng.) growing at a semi-arid treeline has increased during the past 37 years. Tree ring width by contrast has declined, likely caused by reduced stomatal conductance due to increasing aridity.Rising atmospheric CO$_{2}$ concentration (C $_{ a }$) has been related to tree growth enhancement accompanied by increasing intrinsic water use efficiency (iWUE). Nevertheless, the extent of rising C $_{ a }$ on long-term changes in iWUE and growth has remained poorly understood to date in Mediterranean treeline ecosystems.This study aimed to examine radial growth and physiological responses of P. canariensis in relation to rising C $_{ a }$ and increasing aridity at treeline in Tenerife, Canary Islands, Spain.We evaluated temporal changes in secondary growth (tree ring width; TRW) and tree ring stable C isotope signature for assessing iWUE from 1975 through 2011.Precipitation was the main factor controlling secondary growth. Over the last 36 years P. canariensis showed a decline in TRW at enhanced iWUE, likely caused by reduced stomatal conductance due to increasing aridity.Our results indicate that increasing aridity has overridden the potential CO$_{2}$ fertilization on tree growth of P. canariensis at its upper distribution limit.
Starting Page	741
Ending Page	749
Page Count	9
File Format	PDF
ISSN	12864560
Journal	Annals of Forest Science
Volume Number	73
Issue Number	3
e-ISSN	1297966X
Language	English
Publisher	Springer Paris
Publisher Date	2016-06-07
Publisher Institution	Institut National de la Recherche Agronomique (INRA)
Publisher Place	Paris
Access Restriction	Subscribed
Subject Keyword	Climate change Mediterranean climate Drought Stable carbon isotope Canary island pine Treeline Forestry Wood Science & Technology Forestry Management Tree Biology Environment
Content Type	Text
Resource Type	Article
Subject	Ecology Forestry

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