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Climate-Induced Larch Growth Response Within the Central Siberian Permafrost ZoneAim: estimation of larch (Larix gmelinii) growth response to current climate changes. Location: permafrost area within the northern part of Central Siberia (approximately 65.8 deg N, 98.5 deg E). Method: analysis of dendrochronological data, climate variables, drought index SPEI, GPP (gross primary production) and EVI vegetation index (both Aqua/MODIS satellite derived), and soil water content anomalies (GRACE satellite measurements of equivalent water thickness anomalies, EWTA). Results: larch tree ring width (TRW) correlated with previous year August precipitation (r = 0.63), snow accumulation (r = 0.61), soil water anomalies (r = 0.79), early summer temperatures and water vapor pressure (r = 0.73 and r = 0.69, respectively), May and June drought index (r = 0.68-0.82). There are significant positive trends of TRW since late 1980s and GPP since the year 2000. Mean TRW increased by about 50%, which is similar to post-Little Ice Age warming. TRW correlated with GPP and EVI of larch stands (r = 0.68-0.69). Main conclusions: within the permafrost zone of central Siberia larch TRW growth is limited by early summer temperatures, available water from snowmelt, water accumulated within soil in the previous year, and permafrost thaw water. Water stress is one of the limiting factors of larch growth. Larch TRW growth and GPP increased during recent decades.
Document ID
20160013885
Document Type
Reprint (Version printed in journal)
Authors
Kharuk, Viacheslav I. (Universities Space Research Association Greenbelt, MD, United States)
Ranson, Kenneth J. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Im, Sergei T. (Sukachev Institute of Forest Krasnoyarsk, Russia)
Petrov, Il'ya A. (Sukachev Institute of Forest Krasnoyarsk, Russia)
Date Acquired
November 30, 2016
Publication Date
December 10, 2015
Publication Information
Publication: Environmental Research Letters
Volume: 10
Issue: 12
Subject Category
Earth Resources and Remote Sensing
Report/Patent Number
GSFC-E-DAA-TN29816
Funding Number(s)
CONTRACT_GRANT: RSF-14-24-00112
CONTRACT_GRANT: NNG11HP16A
Distribution Limits
Public
Copyright
Other
Keywords
permafrost thaw
larch growth
water stress