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| DOI： |
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| Spatio-temporal Variation of Crop Growth and Its Impacting Factors in Central Yunnan Province |
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WANG Jie, CAO Yan, HUANG Ying, ZHANG Lei, QI Na
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Yunnan Institute of Water Resources and Hydropower Research, Kunming 650228, China
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| Abstract: |
| This paper analyzed the spatio-temporal variation of crop growth in central Yuannan Province under different climate changes based on the maximum and minimum temperature and other factors measured at 49 stations from 1964 to 2013 in this region, using the Mann-kendall rank test and the wave-let analysis method. The results showed that:①The mean annual growing-season-length (GSL) was 362.58 d, and the GSL, frost-free days and minimum temperature (Tmin) all significantly increased from 1964 to 2013, with the rate of GSL increasing by 0.371 d/10 a. In the meantime, the maximum temperature increased slightly, while the precipitation decreased. The GSL dropped in 1988, followed by a significant increase in 1999. There were a 9 a and a 25 a periods. ②The GSL was higher in the central regions than at the east and the west, and it increased from the central south to the east and the west, especially in the northeast and northwest. ③There was a significant positive correlation between GSL and the frost-free day, as well as Tmin. The change in GSL was mostly affected by Tmin. |
| Key words: GSL; temporal and spatial variation; temperature; central area of Yunnan province |
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