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  The impact of induced drought on transpiration and growth in a temperate pine plantation forest

Mackay, S. L., Arain, M. A., Khomik, M., Brodeur, J. J., Schumacher, J., Hartmann, H., et al. (2012). The impact of induced drought on transpiration and growth in a temperate pine plantation forest. Hydrological Processes, 26(12), 1779-1791. doi:10.1002/hyp.9315.

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Mackay, S. L., Author
Arain, M. A., Author
Khomik, M.1, Author           
Brodeur, J. J., Author
Schumacher, J., Author
Hartmann, Henrik2, Author           
Peichl, M., Author
Affiliations:
1Research Group Biogeochemical Model-data Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497760              
2Tree Mortality Mechanisms, Dr. H. Hartmann, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497781              

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Free keywords: drought throughfall exclusion transpiration sapflow forest growth eddy covariance Pinus strobus white pine afforestation xylem sap flow amazonian rain-forest canopy conductance climate-change soil-moisture age-sequence oak forest deciduous forest water dynamics carbon fluxes
 Abstract: The effects of early growing season droughts on water and carbon balances in conifer forests are poorly understood. In this study, the response of canopy transpiration (Ec) and growth rates to reduced precipitation input during the early growing season was evaluated in a 70-year old temperate white pine (Pinus strobus L.) plantation forest, in Southern Ontario, Canada. In order to induce the drought, a 20 x 20?m throughfall exclusion setup was established. Throughfall was excluded from 1 April to 3 July 2009. During this period, 270?mm of rainfall occurred (27% of annual precipitation), of which more than 90% was excluded. Sapflow, stem growth, soil moisture and soil temperature were measured in both drought and reference plots. Prior to the induced drought, both plots showed similar soil water content, transpiration rates and tree diameters. The primary control on forest water loss was vapour pressure deficit, whereas soil moisture had an effect when it reached below 0.068?m3?m-3 during the growing season. The rainfall exclusion did not negatively affect Ec until early June, approximately 54?days after drought initiation. Ec was 27% less in the drought plot compared to the reference plot when evaluated at the end of the growing season in November. Tree growth estimates at the end of the growing season indicated a 17% decrease in growth in the drought plot as compared to the reference plot. Because climate predictions foresee changes in precipitation pattern, drought spells similar to this artificial short-term rainfall manipulation may be more frequent in the future. Hence, although overall precipitation may remain the same, the short-term deficit in water supply may have important implications for forest ecosystems. The findings of this rainfall manipulation will help quantify the impacts of spring and early summer water deficit on forest ecosystems and evaluate their potential responses to future climate regimes. Copyright (C) 2012 John Wiley & Sons, Ltd.

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Language(s): eng - English
 Dates: 2011-05-142012-05-082012
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1002/hyp.9315
ISI: ://WOS:000304909700005
Other: BGC1781
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Title: Hydrological Processes
Source Genre: Journal
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Publ. Info: Chichester, Sussex, England : Wiley
Pages: - Volume / Issue: 26 (12) Sequence Number: - Start / End Page: 1779 - 1791 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/954925551357
ISSN: 0885-6087