9780521861724htl 1..2

0.0

0

1

2

3

4

0.4 0.8 1.2

Community biomass

Predicted CO

flux 2

(a)

0.00

0.0

0.5

1.0

1.5

0.04 0.08

Community biomass

Predicted CO

flux 2

(b)

r^2 = 0.43; p = 0.008

0

2.0

3.0

4.0

1234

Predicted CO 2 flux

Observed CO

flux 2

(e)

0.0 0.5 1.0 1.5

Predicted CO 2 flux

r^2 = 0.35; p = 0.04

2.0

2.5

3.0

Observed CO

flux 2

(f)

r^2 = 0.48; p = 0.004

0.0

2.0

3.0

4.0

0.4 0.8 1.2

Community biomass

Observed CO

flux 2

(c)

r^2 = 0.08; p = 0.38

0.0

2.0

2.5

3.0

0.04 0.08

Community biomass

Observed CO

flux 2

(d)

Figure 13.7Relationships between total community biomass, total community metabolism and

predicted community metabolism (measured as CO 2 flux). The left column of graphs

contains all available data, the right column excludes the three communities with very

high biomass that are obvious in (a). The explanatory power (r^2 ) and statistical significance

of linear regression is given for the lower four graphs only.

260 O.L. PETCHEYET AL.