Ecological Archives E094063A2
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 metaanalysis. Ecology 94:726–738. http://dx.doi.org/10.1890/120279.1
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 metaanalysis.
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 
Fig. B1. Global distribution of manipulative warming experiments included in this metaanalysis. Most studies have been conducted in the North America and Europe.
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.
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.
Fig. B4. The weighted response ratios (RR++) for the responses to experimental warming of 5 variables (net N mineralization, soil inorganic N, soil NH_{4}+ concentration, soil NO_{3} 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.