| Trend analysis for the variety of arid index in Taohe River Basin in recent 40 years |
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| DOI：10.7606/j.issn.1000-7601.2014.05.042 |
| Key Words: arid index Holdridge life zone warm-drying Taohe River Basin |
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| Abstract: |
| Using the surface meteorological observed data in 7 climate stations in Taohe River Basin, according to the Holdridge life zone model analyzed the variety of arid index in Taohe River Basin in recent 40 years(1971～2010). The results shown that: The possible evapotranspiration rate (PER) was increasing by the tendency of 0.02 to 0.07·10a-1 in Taohe River Basin in recent 40 years, the mean PER was increased 0.12 after the 1990s comparing before 1990s. From starting 90th 20 century, the Taohe River Basin occured obvous drying trend, the temperature showed an obviously increasing trend with the tendency ratio of 0.32℃·10a-1 to 0.54℃·10a-1. The warm mutation of the temperature was occured in the end of 1980s to 1990s, the precipitation in the Taohe River Basin was shown a decreasing trend. Among them, the middle reaches and lower reaches was reduced most obvious, the decreasing trend was 13.3 to 21.8 mm·10a-1. In the Taohe River Basin occurs a obviously warm-drying trend. |
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