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Forest Ecosystems

Table 3 Results of GAMs applied to inventory data from the USA

From: Tree species richness enhances stand productivity while stand structure can have opposite effects, based on forest inventory data from Germany and the United States of America

  

USA

Term

Intercept a

Std. error

Sig.

R-sq. (adj)

QI/QII

f 1 (Lon × Lat)

6.22

0.00

***

0.90

f 2 (Precip × Temp)

***

f 3 (R × CVd)

***

f 4 (SDI × dq)

***

QIII

f 1 (Lon × Lat)

0.44

0.00

***

0.37

f 2 (Precip × Temp)

***

f 3 (SDI × R)

***

  1. Lon longitude, Lat latitude, Precip annual precipitation, Temp mean annual temperature, R species richness, CVd coefficient of variation of diameter, SDI stand density index, dq quadratic mean diameter (cm). Sig. Significance values: 0 ‘***’, 0.001 ‘**’, 0.01 ‘*’, 0.05
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