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Table 4 Relationship of the soil respiration and the heterotrophic respiration with 5-cm soil temperature or moisture content under different simulated acid rain treatments

From: Effects of simulated acid rain on soil respiration and its component in a mixed coniferous-broadleaved forest of the three gorges reservoir area in Southwest China

Treatment

5-cm soil temperature

5-cm soil water content

5-cm soil temperature and water content

Fitting equation (y = a × eb × T)

Q10

Fitting equation (y = cM2 + dM + e)

Fitting equation (y = f × eg × T × Mh)

a

b

R 2

a

b

c

R 2

a

b

c

R 2

UTCK

0.69

0.06

0.95**

1.90

0.03

−1.59

21.02

0.11

1.96

0.06

−0.33

0.96**

UT4.0

0.62

0.07

0.94**

1.99

0.03

−1.53

20.51

0.09

2.30

0.07

−0.41

0.96**

UT3.25

0.51

0.07

0.94**

2.10

0.03

−1.66

21.81

0.11

1.46

0.07

−0.33

0.95**

UT2.5

0.42

0.08

0.91**

2.27

0.04

−1.82

23.69

0.11

1.58

0.08

−0.41

0.92**

TCK

0.47

0.07

0.86**

1.93

0.10

−4.57

54.75

0.23

1.27

0.07

−0.31

0.87**

T4.0

0.37

0.08

0.94**

2.16

0.11

−5.34

63.40

0.28*

0.60

0.08

−0.15

0.94**

T3.25

0.38

0.07

0.92**

1.97

0.09

−4.17

50.03

0.28*

1.98

0.07

−0.52

0.93**

T2.5

0.28

0.08

0.83**

2.25

0.10

−4.54

54.03

0.29*

0.55

0.08

−0.21

0.83**

  1. In the equations, y represents the soil respiration rate (μmol∙m−2·s−1), T represents 5-cm soil temperature (°C), M represents 5-cm soil moisture content, and a, b, c, d, e, f, g, and h are constants. UTCK, UT4.0, UT3.25, and UT2.5 indicate control, pH 4.0, pH 3.25, and pH 2.5 simulated acid rain in the untrenched plots, respectively; TCK, T4.0, T3.25, and T2.5 indicate the control, pH 4.0, pH 3.25, and pH 2.5 simulated acid rain in the trenched plots, respectively. * significant correlation (P < 0.05); ** highly significant correlation (P < 0.01)