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| DOI：10.13522/j.cnki.ggps.2017.0245 |
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| The Characteristics of Diurnal Temperature Change and Its Consequent Impact on Crop Growth in Kunming |
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CAO Yan, WANG Jie, 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: |
| 【Objective】 Temperature controls crop growth and the objective of this paper is to analyze the characteristics of diurnal temperature change and its associated impact on crop growth in Kunming, Yunnan Province.【Method】 Based on the highest and lowest temperature measured daily from 24 weather stations as well as crops yield in and around Kunming from 1961 to 2013, we calculated the diurnal temperature difference (DTR) and its impact on growing duration (GSL) and yield of the crops. 【Result】 The annual average DTR decreased considerably from 1961 to 2013 approximately at -0.134 ℃/decade. The M-T analysis revealed that the DTR endured an abrupt drop in 1986, followed by a monotonic decrease since 1991. Annually, DTR decreased in spring, autumn and winter, especially in spring, while it increased in summer. Spatially, the DTR declined from the northwest to the southeast and from the west to the east. In Summer, the DTR increased mainly in the central and southern parts of the region, and decreased in the southeast and the northeast. There was a significant negative correlation between DTR and GSL, particularly in Spring. The overall climatic maize yield had increased during this period, but varying spatially with the increase in the middle higher than that in the northwest and the southeast. We also found a consistent and significant correlation between the relative climatic maize yield and the DTR. 【Conclusion】 An DTR increase in summer, coupled with a decrease in spring and autumn, benefits crop yield. |
| Key words: DTR; temperature; GSL; crop yield; Kunming |
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