Recent above-ground biomass changes in central Chukotka (Russian Far East) using field sampling and Landsat satellite data
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Published:2021-06-04
Issue:11
Volume:18
Page:3343-3366
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ISSN:1726-4189
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Container-title:Biogeosciences
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language:en
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Short-container-title:Biogeosciences
Author:
Shevtsova IuliiaORCID, Herzschuh Ulrike, Heim BirgitORCID, Schulte LuiseORCID, Stünzi SimoneORCID, Pestryakova Luidmila A., Zakharov Evgeniy S., Kruse StefanORCID
Abstract
Abstract. Upscaling plant biomass distribution and dynamics is
essential for estimating carbon stocks and carbon balance. In this respect,
the Russian Far East is among the least investigated sub-Arctic regions
despite its known vegetation sensitivity to ongoing warming. We
representatively harvested above-ground biomass (AGB; separated by dominant
taxa) at 40 sampling plots in central Chukotka. We used ordination to relate
field-based taxa projective cover and Landsat-derived vegetation indices. A
general additive model was used to link the ordination scores to AGB. We
then mapped AGB for paired Landsat-derived time slices (i.e. 2000/2001/2002
and 2016/2017), in four study regions covering a wide vegetation gradient
from closed-canopy larch forests to barren alpine tundra. We provide AGB
estimates and changes in AGB that were previously lacking for central
Chukotka at a high spatial resolution and a detailed description of
taxonomical contributions. Generally, AGB in the study region ranges from 0
to 16 kg m−2, with Cajander larch providing the highest contribution.
Comparison of changes in AGB within the investigated period shows that the
greatest changes (up to 1.25 kg m−2 yr−1) occurred in the northern
taiga and in areas where land cover changed to larch closed-canopy forest.
As well as the notable changes, increases in AGB also occur within the land-cover classes. Our estimations indicate a general increase in total AGB
throughout the investigated tundra–taiga and northern taiga, whereas the
tundra showed no evidence of change in AGB.
Funder
Russian Foundation for Basic Research Ministry of Science and Higher Education of the Russian Federation
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
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