By
J.I. House & D.O. Hall
Division of Life Sciences, King's College London

 
 

 

 Figure 2. The relationship between total NPP and aboveground NPP

 
   

 

Trend line equations

Linear through zero

polynomial

y = 1.5976x

y = -0.0006x2 + 3.0389x - 630.31

R2 = 0.7828

R2 = 0.845

Linear regression non-forced intercept

y = 1.4225x + 284.26

R2 = 0.7975

logarithmic

y = 1690.4Ln(x) - 9767

R2 = 0.8273

power

y = 2.2636x0.954

R2 = 0.8917

exponnon-0

y = 686.97e0.0008x

R2 = 0.7926

 

Notes:
Based on Scholes & Hall, 1996, table 4.2, recompiled in this chapter as Table 3.

Excluding "plantations" and outlier site Manaus, Brazl

DM = dry matter

 
  ACKNOWLEDGEMENTS

Many thanks to Bob Scholes (CSIR, South Africa), Xavier Le Roux (INRA, Clermont-Ferrand, France), Jonathan Scurlock (ORNL, USA) and Joe Scanlan (Department of Natural Resources, Queensland, Australia) for providing information and making corrections to the manuscript. Dale Kaiser & Sonja Jones (ORNL, USA) for calculating tropical % of the Olson et al (1983) "grasslands" category.

Sadly, David Hall passed away in August 1999 before this chapter was published. His knowledge and love of savannas was only surpassed by his eagerness to learn and teach.

 
REFERENCES
Table 1: Previous estimates of area, biomass and NPP of savannas and grasslands
Table 2: Broad plant functional types found in African savannas (from Scholes et.al., 1997)
Table 3: Biomass reported for tropical grasslands and savannas
Table 4: Primary production reported for tropical grasslands and savannas
Table 5: Biophysical properties, fluxes and efficiencies

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