(daily) net photosynthesis (PSN) and (annual) net primary production (NPP)

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Presentation transcript:

(daily) net photosynthesis (PSN) and (annual) net primary production (NPP)

PSN and NPP  (daily) net photosynthesis (PSN)  (annual) net primary production (NPP)  relate to net carbon uptake  important for understanding global carbon budget (climate change)

PSN and NPP  C0 2 removed from atmosphere –photosynthesis  C0 2 released by plant (and animal) –respiration  Net Photosynthesis (PSN)  net carbon exchange over 1 day: (photosynthesis - respiration)

PSN and NPP  Net Primary Productivity (NPP)  annual net carbon exchange  quantifies actual plant growth –(not just C0 2 fixation)

Algorithms - require to be model-based  simple Production efficiency model (PEM) –(Monteith, 1972; 1977)  relate PSN, NPP to APAR  APAR from PAR and fAPAR

 PSN = daily total photosynthesis  NPP, PSN typically accum. of dry matter (convert to C by assuming DM 48% C)  = efficiency of conversion of PAR to DM (g/MJ)  equations hold for non-stressed conditions

to characterise vegetation need to know: Efficiency fAPAR so for fixed

Determining  herbaceous vegetation (grasses):  av gC/MJ for C 3 plants  higher for C 4  woody vegetation:  gC/MJ simple model for :

References Dubayah, R. (1992) Estimating net solar radiation using Landsat Thematic Mapper and Digital Elevation data. Water resources Res., 28: Monteith, J.L., (1972) Solar radiation and productivity in tropical ecosystems. J. Appl. Ecol, 9: Monteith, J.L., (1977). Climate and efficiency of crop production in Britain. Phil. Trans. Royal Soc. London, B 281: Running, S.W., Nemani, R., Glassy, J.M. (1996) MOD17 PSN/NPP Algorithm Theoretical Basis Document, NASA.