1. Luyssaert Reading Support
Critical Zone Science
InTeGrate Teaching Team
(Washburne, UA)
unused Copyrighted figures can be found at: Global Change Biology (GCB), Volume 13, Issue 12, December 2007, Pages: 2509–2537, S. LUYSSAERT, et al.
Version of Record online : 21 AUG 2007, DOI:  /j x

2. GPP = NPP + Ra (always a sink)
NOTATION
GPP = NPP + Ra (always a sink)
NPP = fNPP + wNPP + rNPP + mNPP = biomass
NEP = NPP – Rh
GPP = NEP + Re (eddy covariance)
Re = Ra + Rh; Rs = Ra + Rh (below ground part)
Respiration: autotrophic (plants) or heterotrophic (microbial)
Conceptual understanding based on carbon cycle diagrams but hard to measure most of these components.
Students will be reading this article for homework so this is just an introduction.
CO2 balance of boreal, temperate, and tropical forests derived from a global database
S. LUYSSAERT. et al., Global Change Biology, Aug 21, 2007
after Luyssaert, etal, GCB, 2007

3. How much is there? Terrestrial Ecosystems – Net primary Production Can be factor of 2 uncertainty in rates!
Feb 21, 2017
John Wiley and Sons
Ecological Monographs
The global distribution of net primary production: resolving the paradox
Michael A. Huston,Steve Wolverton
Aug 1, 2009
Huston & Wolverton, Ecol .Mono, 79(3), 2009
By Permission: J. Wiley Lic , 8/9/16

4. Global Ecosystems – Gross Primary Production
How much is there?
Global Ecosystems – Gross Primary Production
AREA
NPP
Global %
~37 GTC
Modified from Wikipedia datatable
Data from From R.H. Whittaker, quoted in Peter Stiling (1996), "Ecology: Theories and Applications" (Prentice Hall).
Originally found at but link is dead
Somewhat different results can be found in Fig. 1 of Huston & Wolverton, Ecol .Mono, 79(3), 2009
~5.1 x 1014 m2
=> 168 GTC/y
Data after RH Whitaker as found on Wiki/Primary_production