Response of CO2 and H2O fluxes in a mountainous tropical rainforest in equatorial Indonesia to El Niño eventsстатья
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Дата последнего поиска статьи во внешних источниках: 22 ноября 2015 г.
Аннотация:The possible impact of El Niño–Southern Oscillation
(ENSO) events on the main components of CO2 and
H2O fluxes between the tropical rainforest and the atmosphere
is investigated. The fluxes were continuously measured
in an old-growth mountainous tropical rainforest in
Central Sulawesi in Indonesia using the eddy covariance
method for the period from January 2004 to June 2008. During
this period, two episodes of El Niño and one episode of
La Niña were observed. All these ENSO episodes had moderate
intensity and were of the central Pacific type. The temporal
variability analysis of the main meteorological parameters
and components of CO2 and H2O exchange showed a
high sensitivity of evapotranspiration (ET) and gross primary
production (GPP) of the tropical rainforest to meteorological
variations caused by both El Niño and La Niña episodes.
Incoming solar radiation is the main governing factor that
is responsible for ET and GPP variability. Ecosystem respiration
(RE) dynamics depend mainly on the air temperature
changes and are almost insensitive to ENSO. Changes in precipitation
due to moderate ENSO events did not have any notable
effect on ET and GPP, mainly because of sufficient soil
moisture conditions even in periods o