Comparing forest measurements from tree rings and a space-based index of vegetation activity in Siberia

Different methods have been developed for measuring carbon stocks and fluxes in the northern high latitudes, ranging from intensively measured small plots to space-based methods that use reflectance data to drive production efficiency models. The field of dendroecology has used samples of tree growt...

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Bibliographic Details
Published in:Environmental Research Letters
Main Authors: Andrew G Bunn, Malcolm K Hughes, Alexander V Kirdyanov, Mark Losleben, Vladimir V Shishov, Logan T Berner, Alexander Oltchev, Eugene A Vaganov
Format: Article in Journal/Newspaper
Language:English
Published: IOP Publishing 2013
Subjects:
carbon cycling
TRW
MXD
NDVI
taiga
boreal forest
Environmental technology. Sanitary engineering
TD1-1066
Environmental sciences
GE1-350
Science
Q
Physics
QC1-999
Siberia
Online Access:https://doi.org/10.1088/1748-9326/8/3/035034
https://doaj.org/article/20fa7972063749f284d370942fee8f14
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Summary:Different methods have been developed for measuring carbon stocks and fluxes in the northern high latitudes, ranging from intensively measured small plots to space-based methods that use reflectance data to drive production efficiency models. The field of dendroecology has used samples of tree growth from radial increments to quantify long-term variability in ecosystem productivity, but these have very limited spatial domains. Since the cambium material in tree cores is itself a product of photosynthesis in the canopy, it would be ideal to link these two approaches. We examine the associations between the normalized differenced vegetation index (NDVI) and tree growth using 19 pairs of tree-ring widths (TRW) and maximum latewood density (MXD) across much of Siberia. We find consistent correlations between NDVI and both measures of tree growth and no systematic difference between MXD and TRW. At the regional level we note strong correspondence between the first principal component of tree growth and NDVI for MXD and TRW in a temperature-limited bioregion, indicating that canopy reflectance and cambial production are broadly linked. Using a network of 21 TRW chronologies from south of Lake Baikal, we find a similarly strong regional correspondence with NDVI in a markedly drier region. We show that tree growth is dominated by variation at decadal and multidecadal time periods, which the satellite record is incapable of recording given its relatively short record.

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