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Table 2 Equation parameters and variance explained by five environmental and tree size variables regressed on mean daily xylem flux density (J d, g cm−2 day−1) for the seven tree species investigated

From: Environment and tree size controlling stem sap flux in a perhumid tropical forest of Central Sulawesi, Indonesia

Species

R 2

Parameter estimates

Model

DBH

H

D mean

R

SWC

b 0

b 1

b 2

b 3

b 4

b 5

V. arborea

0.59

0.13

0.008

0.32

0.13

0.004

−22.57

−0.454

0.585

40.965

0.003

0.52

S. apiculata

0.53

0.12

0.008

0.34

0.04

0.013

51.47

−0.507

0.595

44.547

0.003

−1.025

P. luzoniense

0.64

0.34

0.130

0.16

0.01

n.s.

−42.13

0.141

1.770

66.293

0.002

n.s.

C. laevigata

0.82

0.39

0.013

0.36

0.04

0.007

−74.93

2.654

−0.829

68.278

0.002

0.792

P. firma

0.84

0.59

0.013

0.18

0.05

0.001

−52.09

2.247

−1.353

72.609

0.004

0.627

P. excelsa

0.54

0.19

0.032

0.28

0.02

0.006

15.30

0.613

−3.288

89.333

0.002

0.986

C. acuminatissima

0.39

0.18

n.s.

0.13

0.05

0.022

−142.43

0.810

n.s.

91.029

0.005

3.067

  1. The multiple regression analyses followed the general model: J d = b 0 + b 1DBH + b 2 H + b 3 D + b 4 R + b 5SWC. Data used in the analysis are from 2008. The coefficient of determination (R 2) for the general regression model is also presented. Non-significant variables (n.s.) were removed from the initial model. Only variables significant at the 0.05 level were left in the model
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Annals of Forest Science

ISSN: 1297-966X