Table 1 Summary of the effects in the linear model of RS during 1987–2016a.

From: Temporal changes in global soil respiration since 1987

Effect

Degree of freedom

F

P

Year

1

9.063

0.003

Year2

1

5.964

0.015

Biome

5

6.444

0.001

Latitude

1

870.373

0.001

ΔMAT

1

9.005

0.003

Year × Biome

5

3.077

0.009

Year × Latitude

1

4.925

0.027

Year × SOC

1

18.469

0.001

Biome × ΔMAT

5

3.887

0.002

Biome × ΔMAP

5

2.480

0.030

Biome × ΔMAT × ΔMAP

5

6.978

0.001

  1. aThe statistically significant (P < 0.050) effects are shown. Effects tested in the linear model include the year of RS measurement and its quadratic form (Year2), biome (tropical, subtropical, Mediterranean, temperate, boreal and Arctic), measurement method, latitude, altitude, stage (aggrading or mature ecosystem), ecosystem type (i.e., forest, grassland, savanna, shrubland, and wetland), SOC stock, and climatic factors (MAT, MAP, ΔMAT, and ΔMAP). The “×” sign denotes an interaction term. All terms and more detailed information are shown in Supplementary Table 2.
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