Photosynthesis in field conditionss l Pertti Hari.
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Transcript of Photosynthesis in field conditionss l Pertti Hari.
Photosynthesis in field conditionss
Pertti Hari
Role of photosynthesis
Dominating source of raw material
Source of energy
Photosynthesis
Light reactions capture of light energy formation of ATP and NADPH
Dark reactions capture of CO2
synthesis of sugar using ATP and NADPH
Chamber Measurements
Chamber is closed for measurements
Mass balance equation for determination of the flux
d(Vc Cc )
dtg qCc qCr
Chamber in action
QuickTime™ and aPhoto - JPEG decompressor
are needed to see this picture.
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
Measuring precission
Can be measured
Compare measurements of the some flux
Chamber measurements for CO2 exchange
During one closure several measurements of CO2 exchange
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
Measured and Modelled CO2 exchange at SMEAR I 1999
Time, rel units Time, rel units
CO
2 exc
hang
eC
O2 e
xcha
nge
Comparision of measured and modelled CO2 exchange summer
1999
Measured CO2 exchange
Modelled CO2 exchange