photosynthesis in field conditionss l pertti hari
TRANSCRIPT
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Photosynthesis in field conditionss
Pertti Hari
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Role of photosynthesis
Dominating source of raw material
Source of energy
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Photosynthesis
Light reactions capture of light energy formation of ATP and NADPH
Dark reactions capture of CO2
synthesis of sugar using ATP and NADPH
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Chamber Measurements
Chamber is closed for measurements
Mass balance equation for determination of the flux
d(Vc Cc )
dtg qCc qCr
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Chamber in action
QuickTime™ and aPhoto - JPEG decompressor
are needed to see this picture.
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Models For Gas Exchange
p(t, x) f (I(t, x),T (t, x), a, b)
p is gas exchange
t timex space coordinatesI light intensityT temperature
a and b parameters
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Measuring precission
Can be measured
Compare measurements of the some flux
Chamber measurements for CO2 exchange
During one closure several measurements of CO2 exchange
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Comparision of Measurements of CO2 exchange during 10 s at SMEAR I
Precission can be determined as residual of the regression
CO
2 exc
hang
e du
ring
10
s st
arti
ng 3
0 s
afte
r cl
osur
e
CO2 exchange during 10 s starting 20 s after closure
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Measured and Modelled CO2 exchange at SMEAR I 1999
Time, rel units Time, rel units
CO
2 exc
hang
eC
O2 e
xcha
nge
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Comparision of measured and modelled CO2 exchange summer
1999
Measured CO2 exchange
Modelled CO2 exchange
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