Combined effects of reindeer grazing and
global warming on sub-arctic carbon
stocks
Henni Ylänne
Warming increases Re
in all grazing
treatments,
GEP increases with
warming only in HG
and HGexc.
G
E
P
R
e
NEE = Re - GEP
Warming decreases C
sink by 38% under LG,
it has no effect under
HG or HGexc
Under ambient
conditions LG is a 70%
stronger C sink than HG
or HGexc
Väisänen M, Ylänne H, Kaarlejärvi E, Sjögersten S, Olofsson J, Crout N, Stark S (2014) Consequences of warming on
tundra carbon balance determined by reindeer grazing history. Nature Climate Change, 4, 384–388.
Carbon stocks
Modeled net ecosystem exchange
Warming increases ecosystem
C stocks, and simulated
herbivory shifts carbon from
below-ground to above-ground
Ylänne H, Tolvanen A, Stark S (manuscript) Selective herbivory controls local carbon cycle feedbacks to warming:
evidence from 19 years of experimental warming and simulated herbivory in a sub-arctic tundra heath.