IMPACT OF CLIMATE CHANGE IMPACT OF CLIMATE CHANGE ON CANOPY CO ON CANOPY CO 2 2 AND H AND H 2 2 O O EXCHANGE OF A TROPICAL EXCHANGE OF A TROPICAL RAINFOREST IN PENINSULAR RAINFOREST IN PENINSULAR MALAYSIA, PASOH MALAYSIA, PASOH Yoshiko Kosugi (Kyoto Univ.) Yoshiko Kosugi (Kyoto Univ.) Satoru Takanashi (FFPRI) Satoru Takanashi (FFPRI) Makoto Tani (Kyoto Univ.) Makoto Tani (Kyoto Univ.) Shinjiro Ohkubo (Kyoto Univ.) Shinjiro Ohkubo (Kyoto Univ.) Naoko Matsuo (Mie Univ.) Naoko Matsuo (Mie Univ.) Masayuki Itoh (Kyoto Univ.) Masayuki Itoh (Kyoto Univ.) Shoji Noguchi (FFPRI) Shoji Noguchi (FFPRI) Abdul Rahim Nik (FRIM) Abdul Rahim Nik (FRIM)
16
Embed
IMPACT OF CLIMATE CHANGE ON CANOPY CO2 AND H2O … · 2011-11-07 · IMPACT OF CLIMATE CHANGE ON CANOPY CO2 AND H2O EXCHANGE OF A TROPICAL RAINFOREST IN PENINSULAR MALAYSIA, PASOH
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
IMPACT OF CLIMATE CHANGE IMPACT OF CLIMATE CHANGE ON CANOPY COON CANOPY CO22 AND HAND H22O O
EXCHANGE OF A TROPICAL EXCHANGE OF A TROPICAL RAINFOREST IN PENINSULAR RAINFOREST IN PENINSULAR
MALAYSIA, PASOHMALAYSIA, PASOHYoshiko Kosugi (Kyoto Univ.)Yoshiko Kosugi (Kyoto Univ.)
Satoru Takanashi (FFPRI)Satoru Takanashi (FFPRI)Makoto Tani (Kyoto Univ.)Makoto Tani (Kyoto Univ.)
Seasonal variation of GPP ・・・・RE were influenced by VSWC. At the dry period, canopy tended to absorb CO 2, caused by decrease of RE larger than that of GPP.
No dependence of daily GPP on daily solar radiation
moderate decline of GPP at the dry period
GP
P (
gC m
-2 y
ear-1
)
3000
3200
3400
3600Method 1Method 2Method 3
Sd (MJ m- -2 year -1)
5800 6000 6200 6400 6600
NE
E (
gC m
-2 y
ear-1
)
-300
-200
-100
0
100
200
300
Rainfall (mm year -1)
1400 1600 1800 2000 2200
VSWCannualmean (m3 m-3)
0.25 0.30 0.35
RE
(gC
m-2
yea
r-1)
3000
3200
3400
3600
Annual Annual GPPGPP・・・・・・・・NEENEE・・・・・・・・RERE
GPP
RE
NEE
Radiation Rainfall Soil Water
No increase of annual GPPwith solar radiation
GPP/RE increase with VSWC
mostly balanced annual NEE
Annual budget influenced lot by the method of gap f illing and correction. Cross check with ecological and ecophysiological dat a is needed.
GPP:30~36tC ha-1 yr-1
RE:30~36tC ha-1 yr-1
NEE:-2~2tC ha-1 yr-1
Observation Campaign of Ecosystem RespirationObservation Campaign of Ecosystem Respiration
2010.22010.2
SummarySummary
�� MicrometeorologyMicrometeorology::had moderate seasonal and had moderate seasonal and interannualinterannual variations influenced by rainfall pattern.variations influenced by rainfall pattern.
�� EvapotranspirationEvapotranspiration:: moderately increased with moderately increased with available energy. Annual balanceavailable energy. Annual balance was stable with was stable with approximately 1300mm. A little decline at the ENSO approximately 1300mm. A little decline at the ENSO dry year.dry year.
�� Ecosystem RespirationEcosystem Respiration::increased with VSWC.increased with VSWC.�� DaitimeDaitime photosynthesisphotosynthesis::did not increase with PPFD. did not increase with PPFD.
Monthly averageMonthly average was stable during 7 years.was stable during 7 years.�� GPPGPP・・NEENEE・・RERE:: GPPGPP did not increase with PPFD, but did not increase with PPFD, but
increased with VSWC. Moderate seasonal and increased with VSWC. Moderate seasonal and interannualinterannual variation of variation of GPPGPP・・RERE・・NEENEE were caused were caused by VSWC.by VSWC.
�� Evapotranspiration and COEvapotranspiration and CO22 exchange at exchange at Pasoh Forest were very stable during these Pasoh Forest were very stable during these several years. several years.
�� StableStable≠≠ StaticStatic
�� In terms of In terms of stomatalstomatal regulation, photosynthetic regulation, photosynthetic ability, and ecosystem respiration, forest acted ability, and ecosystem respiration, forest acted sensitive to climate change. These reactions sensitive to climate change. These reactions compensated each other to produce very stable compensated each other to produce very stable output as a canopy of output as a canopy of PasohPasoh forest.forest.
Prediction for future climate change
� Decrease of Solar radiation ::::
[ET] [ET] ↓↓↓↓↓↓↓↓decrease 、、、、[NEE][NEE] →→→→→→→→ no change� Increase of rainfall ::::
[ET] [ET] →→→→→→→→ no change [GPP][GPP] ↑↑↑↑↑↑↑↑increase[RE] [RE] ↑↑↑↑↑↑↑↑increase[NEE] [NEE] →↑→↑→↑→↑→↑→↑→↑→↑no change or increase(=CO 2 emit)
� Decrease of rainfall ::::[ET] [ET] →↓→↓→↓→↓→↓→↓→↓→↓no change or decrease [GPP][GPP] ↓↓↓↓↓↓↓↓decrease [RE] [RE] ↓↓↓↓↓↓↓↓decrease[NEE] [NEE] →↓→↓→↓→↓→↓→↓→↓→↓no change or decrease(=CO 2 absorb)