Research Article
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 | δ2H average (‰) | δ18O 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 |
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