Ecological Archives E091-168-A1

Tuula Larmola, Eeva-Stiina Tuittila, Marja Tiirola, Hannu Nykänen, Pertti J. Martikainen, Kim Yrjälä, Tero Tuomivirta, and Hannu Fritze. 2010. The role of Sphagnum mosses in the methane cycling of a boreal mire. Ecology 91:2356–2365.

Appendix A. Potential methane oxidation rates detailed by 23 Sphagnum species, habitat, water level, and methane concentration.

 

FIG. A1. Spatial variation in potential CH4 oxidation rates at the Lakkasuo mire detailed by Sphagnum species and habitat (left panels). The average oxidation rates and their standard deviations are indicated. Species are in the order of decreasing water level. The range of long-term median water level and that of CH4 concentration for the species and the habitats are shown in the middle and right panels, respectively. For species occurring only at one location, median water level and CH4 concentration are indicated with solid circles.


 

TABLE A1. The relationship between the potential CH4 oxidation rate in Sphagnum and long-term or actual water-table level (WT) at the Lakkasuo mire for different periods determined using regression modeling. The response models took the form Y = a×exp(-0.5(WT - u)2/t2).


Variable

Parameters (SE)

 

 

R2

dfreg, res

 

a

u

t

 

 

June-October

Long-term WT

11.5(1.3)

-3.5(1.0)

-5.1(0.9)

0.10

3, 179

Actual WT

253(2411)

130(401)

-53(78)

0.20

3, 179

June

Long-term WT

13.4(1.8)

9.4(2.3)

-0.6(2.2)

0.13

3, 120

Actual WT

141471(18562157)

478.9(6976)

111(800)

0.13

3, 120

June, microsite averaged

Long-term WT

12.5(2.2)

-2.2(1.1)

3.7(1.1)

0.27

3, 37

Actual WT

94.3(1364)

105(641)

50(139)

0.23

3, 37

August-October

Long-term WT

6.1(0.9)

9.3(2.2)

3.7(0.6)

0.31

3, 56

Actual WT

9.6(0.8)

-1.6(3.8)

9.3(2.2)

0.79

3, 56

Notes: a, t, and u denote model parameters, R2 coefficient of determination, df reg, res degrees of freedom for regression and residuals.


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