Ecological Archives E094-063-A2

Meng Lu, Xuhui Zhou, Qiang Yang, Hui Li, Yiqi Luo, Changming Fang, Jiakuan Chen, Xin Yang, Bo Li. 2013. Responses of ecosystem carbon cycle to experimental warming: a meta-analysis. Ecology 94:726–738. http://dx.doi.org/10.1890/12-0279.1

Appendix B. Global distribution of manipulative warming experiments, and the frequency distributions of the natural logarithm of response ratios (ln RR) for C fluxes and pools included in this meta-analysis.

Table B1. Regression analysis of ln RR of litter mass loss, soil respiration, ecosystem respiration, aboveground plant C, belowground plant C, and soil C pool against latitude, mean annual temperature (MAT), mean annual precipitation (MAP), warming magnitude (Magnitude), and experimental duration (Duration). The regression analysis was based on lnRR (Variable X)= a + bX, where X is the independent variables, a is the intercept, and b is the regression coefficient. n is sample size, r² is determinant coefficient and P is probability of the regression relationship to be statistically significant. b values in boldare statistically significant from zero.

Variable X

Litter mass loss

Soil respiration

Ecosystem respiration

a

b

n

r²

P

a

b

n

r²

P

a

b

n

r²

P

Latitude

0.34

-0.005

34

0.15

0.026

-0.031

0.003

66

0.029

0.17

0.039

0.003

24

0.011

0.62

MAT

0.024

0.01

34

0.11

0.048

0.12

-0.004

66

0.028

0.18

0.21

~0.00

24

~0.00

0.99

MAP

-0.12

0.0002

34

0.25

0.003

0.076

~0.00

66

0.003

0.66

0.084

0.001

24

0.041

0.34

Magnitude

0.029

0.019

34

0.06

0.17

0.019

0.027

66

0.041

0.10

0.097

0.042

24

0.033

0.40

Duration

0.10

-0.01

34

0.01

0.58

0.09

0.002

66

0.001

0.83

0.32

-0.023

24

0.064

0.23

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Variable X

Aboveground plant C

Belowground plant C

Soil C pool

a

b

n

r²

P

a

b

n

r²

P

a

b

n

r²

P

Latitude

0.008

0.002

83

0.013

0.31

0.036

0.001

67

0.003

0.68

-0.12

0.002

33

0.03

0.33

MAT

0.16

-0.01

83

0.06

0.029

0.13

-0.006

67

0.014

0.34

-0.004

-0.001

33

0.003

0.75

MAP

0.20

-0.0001

83

0.024

0.16

0.22

-0.0002

67

0.028

0.17

0.028

~0.00

33

0.008

0.63

Magnitude

0.11

0.002

83

~0.00

0.95

0.24

-0.055

67

0.039

0.11

-0.033

0.013

33

0.008

0.63

Duration

0.063

0.016

83

0.022

0.18

0.13

-0.007

67

0.004

0.61

0.016

-0.004

33

0.005

0.71

 

FigB1

Fig. B1. Global distribution of manipulative warming experiments included in this meta-analysis. Most studies have been conducted in the North America and Europe.


 

FigB2

Fig. B2. The frequency distributions of the natural logarithm of response ratios (lnRR) for net primary production (NPP, a), gross ecosystem photosynthesis (GEP, b), litter mass loss (LML, c), soil respiration (Rs, d), ecosystem respiration (ER, e) and net ecosystem exchange (NEE, f) responses to experimental warming. The solid curve is a Gaussian distribution fitted to the frequency data. The x axis is ln RR and y axis is frequency. The vertical dash line is at ln RR = 0.


 

FigB3

Fig. B3. The frequency distributions of the natural logarithm of response ratios (ln RR) for plant aboveground part C pool (PACP, a), plant belowground part C pool (PBCP, b), and litter C pool (LCP, c), microbial biomass C (MBC, d), soil C pool (SCP, e) and dissolved organic C (DOC, f) responses to experimental warming. The solid curve is a Gaussian distribution fitted to the frequency data. The x axis is ln RRand y axis is frequency. The vertical dash line is at ln RR = 0.


 

FigB4

Fig. B4. The weighted response ratios (RR++) for the responses to experimental warming of 5 variables (net N mineralization, soil inorganic N, soil NH4+ concentration, soil NO3- concentration, and soil moisture) related to the ecosystem C and N dynamics. Bars represent RR++ ± 95% confidence intervals. The vertical lines are drawn at ln RR= 0. The sample size for each variable is shown next to the bar.


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