by Yoshikazu Ohtani
Eddy covariance measurements of CO2 were
taken for five years above six forests distributed from the northern to
southernmost main islands of Japan.
These forests included cool- and warm-temperate deciduous and coniferous
forests. The climate of Japan
is characterized by apparent seasonal changes and adequate precipitation affected
by the East Asian monsoon. In this report, we compared net ecosystem production
(NEP) among forests using the eddy
covariance method and analyzed the climatic factors that affect seasonal and
inter-annual changes in NEP in
relation to forest type. The observed annual NEP
from 2000 to 2002 ranged from 286 to 566 gCm-2yr-1, and
this basically increased with decreasing latitude. The observed maximum 10 days
mean NEP was about 1.5 times
larger in the deciduous sites, although the growing period was more than 2
times longer in the coniferous sites.
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