Response of soil respiration to experimental warming in a highland barley of the Tibet

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Table 2 Stepwise multiple regression analyses between soil respiration (R _s) and soil temperature (T _s) and soil moisture (SM), showing changes in the regression coefficient, significance probability (p), coefficient of determination (R ²) and partial correlation coefficient

Treatment	Coefficient	R ²	Partial correlation	p
CK
Constant	0.54			<0.001
T _s	0.05	0.43	0.65	<0.001
1000 W
Constant	5.27			<0.001
T _s	0.06	0.24	0.75	<0.001
SM	2.88	0.57	0.88	<0.001
2000 W
Constant	5.43			<0.001
SM	2.20	0.39	0.62	<0.001

Natural logarithm transformations were made for R _s and SM prior to regression analysis. CK: the control, 1000 W: the low warming treatment, and 2000 W: the high warming treatment. T _s and SM coincided with R _s