| Impact of climate change on climatic resources utilization efficiency of wheat and maize in Henan Province |
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| DOI：10.7606/j.issn.1000-7601.2019.05.32 |
| Key Words: climate change wheat maize utilization efficiency of climate resource Henan Province |
| Author Name | Affiliation | | XU Yan-hong | CMA， Henan Key Laboratory of Agrometeorological Support and Applied Technique, Zhengzhou， Henan 450003, China
Luoyang Meteorological Bureau, Luoyang, Henan 471000, China | | LI Shu-yan | CMA， Henan Key Laboratory of Agrometeorological Support and Applied Technique, Zhengzhou， Henan 450003, China
Henan Institute of Meteorological Sciences, Zhengzhou, Henan 450003, China |
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| Abstract: |
| The tempo-spatial characteristics in light utilization efficiency (LUE), heat utilization efficiency (HUE), and precipitation utilization efficiency (PUE) of wheat and maize were studied based on crop production, total solar radiation, accumulated temperature and precipitation during crop growing season from the observed meteorological and crop data at 29 stations during 1981 to 2016 in Henan province. Subsequently, the contribution rates of the changes in climate resource to the change in LUE, HUE and PUE were calculated with the statistical regression method. Finally, climate resource utilization efficiency was comprehensively evaluated. The study results showed that LUE of wheat varied from 1.14 to 1.77 kg·MJ-1, HUE varied from 1.3 to 2.5 kg·℃-1·d-1·hm-2, and PUE varied from 8 to 43 kg·mm-1·hm-2 in Henan province. The LUE of maize varied from 1.8 to 2.5 kg·MJ-1, HUE varied from 1.32 to 1.78 kg·℃-1·d-1·hm-2 and PUE varied from 9.5 to 15.1 kg·mm-1·hm-2. The areas with high values of LUE, HUE and PUE occurred in the northern and eastern parts of Henan, while the low value areas were in the west and south. Accumulated temperature and precipitation were the most important factors affecting climatic resources utilization efficiency of wheat and maize, respectively. Comprehensive Utilization Efficiency Index (CUE*) of wheat varied from 0.24 to 0.50, and CUE* of maize varied from 0.21 to 0.31, and there was a great difference among regions. The improving of HUE of wheat and PUE of maize helped enhanced comprehensive utilization efficiency of climatic resources. |
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