Moisture stress of a hydrological year on tree growth in the Tibetan Plateau and surroundings

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http://hdl.handle.net/10138/161967

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Fang , K , Frank , D , Zhao , Y , Zhou , F & Seppä , H 2015 , ' Moisture stress of a hydrological year on tree growth in the Tibetan Plateau and surroundings ' , Environmental Research Letters , vol. 10 , no. 3 , 034010 . https://doi.org/10.1088/1748-9326/10/3/034010

Title: Moisture stress of a hydrological year on tree growth in the Tibetan Plateau and surroundings
Author: Fang, Keyan; Frank, David; Zhao, Yan; Zhou, Feifei; Seppä, Heikki
Contributor: University of Helsinki, Department of Geosciences and Geography
Date: 2015-03
Language: eng
Number of pages: 12
Belongs to series: Environmental Research Letters
ISSN: 1748-9326
URI: http://hdl.handle.net/10138/161967
Abstract: Investigations of climate-growth interactions can shed light on the response of forest growth to climate change and the dendroclimatic reconstructions. However, most existing studies in the climatically important Tibetan Plateau (TP) and surrouding regions focus on linear growth responses to environmental variation. Herein we investigated both the linear and the nonlinear climate-growth interactions for 152 tree-ring chronologies in the TP and vicinity. Weintroduced the boosted regression tree (BRT) technique to study the nonlinear climate-growth relationships by pooling several sites with similar climate-growth relationships to mitigate potential biases due to the shortness of the instrumental records. Across most of the TP and surroundings, tree growth is stressed by drought. The warming induced drought has been evidenced by the strong interactions between temperature and precipitation in the BRT analyses. The drought stress on forest growth is particularly conspicuous for a hydrological year over much of the Northern TP and surroundings. The BRT analyses indicate the compensation effect of moisture prior to the growing season for the moisture deficit in the early growing season in May to July, when most of the ring-width formation occurs.
Subject: tree ring
boosted regression trees
nonlinearity
climate change
drought
Tibetan Plateau
HIGH-RESOLUTION PALEOCLIMATOLOGY
ARTIFICIAL NEURAL-NETWORKS
PRECIPITATION VARIATION
LAST MILLENNIUM
RING RECORD
CLIMATE
CHINA
RECONSTRUCTION
TEMPERATURE
VARIABILITY
1172 Environmental sciences
114 Physical sciences
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