Ecological Archives A015-060-A2

Lara M. Kueppers and John Harte. 2005. Subalpine forest carbon cycling: short- and long-term influence of climate and species. Ecological Applications 15:1984–1999.

Appendix B. Ecosystem C fluxes (kg C·ha-1·yr-1) along the Fossil Ridge elevational climate and species composition gradient.

 

Plots

 

P1

P2

P3

E1

E2

E3

E4

E5

S1

S2

S3

 

Tree biomass increment

Lodgepole pine

712

301

496

207

278

358

282

35

0

0

0

Engelmann spruce

-0.18

0

0

69

-58

61

-311

59

89

24

477

Subalpine fir

2

0

1

6

11

23

18

18

112

47

0

Total

716

301

496

282

231

442

-11

112

201

71

477

Mortality

23

14

0

416

0

35

274

33

2,341

0

0

 

Fine litterfall

Lodgepole pine

626

438

300

284

456

459

238

71

31

1.0

0.12

 

(153)

(65)

(22)

(54)

(36)

(59)

(3)

(2)

(28)

(0.6)

(0.03)

Engelmann spruce

0.6

0

0.067

226

114

99

447

480

416

637

217

 

(0.2)

 

(0.008)

(13)

(32)

(22)

(24)

(35)

(118)

(54)

(67)

Subalpine fir

0.02

3.7

0.19

1.3

2

7.2

5.1

57

56

67

0.047

 

(0.02)

(0.7)

(0.05)

(0.7)

(1)

(0.8)

(0.7)

(15)

(1)

(18)

(0.001)

Total

861

558

410

694

729

799

1,076

792

812

1,010

344

 

(174)

(47)

(37)

(44)

(58)

(146)

(176)

(19)

(301)

(57)

(23)

 

Soil respiration

Annual total

5,137

5,996

4,964

4,240

4,728

5,480

5,074

5,158

3,633

5,482

4,304

 

(192)

(850)

(417)

(197)

(185)

(380)

(295)

(294)

(112)

(421)

(255)

   
 

Litter decay rate constants (per yr)

Pine needles

0.137

0.109

0.117

0.122

0.138

0.136

0.135

0.122

0.128

0.109

0.130

 

(0.009)

(0.006)

(0.006)

(0.005)

(0.004)

(0.006)

(0.008)

(0.006)

(0.007)

(0.007)

(0.007)

Spruce needles

0.115

0.095

0.105

0.148

0.163

0.121

0.157

0.152

0.127

0.135

0.112

 

(0.010)

(0.009)

(0.009)

(0.028)

(0.024)

(0.017)

(0.028)

(0.025)

(0.011)

(0.021)

(0.009)

Fir needles

0.127

0.107

0.133

0.135

0.162

0.141

0.133

0.164

0.145

0.127

0.144

 

(0.011)

(0.010)

(0.012)

(0.012)

(0.011)

(0.014)

(0.017)

(0.012)

(0.013)

(0.012)

(0.009)

Pine CWD 1

 

0.0029

   

0.0016

           
   

(0.0011)

   

(0.0010)

           

Spruce CWD 1

       

0.0013

       

0.0015

 
         

(0.0015)

       

(0.0010)

 
 

Daily soil respiration rate (kg C·ha-1·d-1)

Summer

21

25

22

17

20

23

21

22

13.1

23

19

 

(3)

(4)

(3)

(2)

(2)

(3)

(2)

(3)

(0.8)

(4)

(2)

Winter

7.7

7.4

6.3

7.3

8.1

8.7

8.8

8.9

8.2

10.1

7.7

 

(0.3)

(0.7)

(0.2)

(0.4)

(0.4)

(0.4)

(0.7)

(0.8)

(0.4)

(0.4)

(0.5)

   Notes: All values except those for soil respiration were calculated from mass fluxes by assuming all biomass contains 50% C. Standard errors are given in parentheses. Tree biomass increment and fine litterfall totals include contributions from aspen (in P1), and fine litterfall total includes non-specific litterfall (twigs, bark, miscellaneous).

† (Kueppers et al. 2004)

LITERATURE CITED

Kueppers, L. M., J. Southon, P. Baer, and J. Harte. 2004. Dead wood biomass and turnover time, measured by radiocarbon, along a subalpine elevation gradient. Oecologia 141:641–651.



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