| The ecological climatic characteristics of spring rape and its response to climate change in Gansu province |
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| DOI：10.16302/j.cnki.1000-7601.2015.01.035 |
| Key Words: climate change temperature precipitation spring rape growing process yield |
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| Abstract: |
| Using information on the growth and yield of rape and meteorological date from the rape planting area in Gansu, Minle (1987—2006) and Hezuo (1987—1999), we analyzed the correlation between characteristics of climate change and rape growth and yield in Gansu province. The results showed that the temperature rises in the spring rape planting area of Gansu due to global warming, with a tendency rate at 0.28～0.31 ℃·10a-1. And the temperature increased more in Hexi Minle region than Gannan cooperation areas. The precipitation was basically stable with minor increase (Minle region) and subtle reduction (Gannan cooperation areas). The rape growth rate went up because of climate warming. The interval days shortened significantly from bud/blossom to blossom/green mature in Minle region, resulting in average decreases of 13D and 4D from 1997 to 2006 than 1986—1996, respectively. Changes in unit climate elements leaded to the climatic yield with inconsistently sensitive degree. Effect of precipitation was positively correlated in Minle region. Water shortage was the main limiting factor for yield increase, influencing mostly at moss flowering stage. The effects of light and temperature were positive in Gannan cooperation areas. Insufficiencies in light and temperature were the primary limiting factors. The precipitation in budding and blossom period showed positively effect. Overall, the climate changes were more favorable for rape yield increase and quality formation in cold and damp area, whereas these were preferred in the temperate steppe climate zones. Rape growth in the latter would be actively adopted by storing water, early sowing, and the introduction of drought resistant measures. |
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