Characteristics of Stable Isotopes in Precipitation and Their Moisture Sources in the Guanling Region, Guizhou Province

Table 2

The δ²H-δ¹⁸O correlation parameters for different precipitation levels in the Guanling region.

Precipitation grades	Temperature class	Sample size	δ^2H average (‰)	δ^18O average (‰)	Rainfall (mm)	The slope of MWL (‰)	The intercept of MWL (‰)	Correlation coefficient (r)
≤ 1 mm	1°C ≤ T ≤ 10°C	7	−2.29	−3.27	4	11.09	33.97	0.859
	10°C < T ≤ 20°C	8	−11.49	−3.62	4	9.02	21.19	0.971
	20°C < T ≤ 30°C	17	−67.39	−9.44	7	7.99	7.99	0.993
1 mm <  ≤ 5 mm	1°C ≤ T ≤ 10°C	7	−18.4	−5.67	19	9.36	29.04	0.979
	10°C < T ≤ 20°C	10	−17.51	−3.45	25	7.77	14.1	0.987
	20°C < T ≤ 30°C	11	−73.45	−10.21	19	8.37	11.99	0.976
5 mm <  ≤ 10 mm	5°C ≤ T ≤ 20°C	5	−48.48	−7.63	47	8.5	16.39	0.997
	20°C < T ≤ 30°C	3	−43.28	−6.54	32	8.13	9.83	0.999
> 10 mm	5°C ≤ T ≤ 20°C	9	−34.23	−5.99	187	7.94	13.34	0.976
	20°C < T ≤ 30°C	9	−78.66	−10.78	198	7.55	2.78	0.973
Total precipitation sample		86	−43.92	−7.13	542	8.81	18.91	0.975