Characteristics and Limiting Factors of Light-temperature Potential Productivity and Yield Gap of Spring Maize in Hunan Province

doi:10.3969/j.issn.1000-6362.2020.02.004

Abstract

Abstract: The stepwise correcting model was applied to calculate the light and temperature potentials of spring maize in Hunan Province from 1987 to 2016. Firstly, the daily light potential productivity was calculated, then the daily light-temperature potential productivity was obtained by correcting it using daily temperature effective coefficient. Finally, the daily values were accumulated to get the yearly light-temperature potential productivity. And the yield gap between actual yield and light-temperature potential productivity was calculated in the 71 major counties. The results showed that the effects of sunshine hours on light-temperature potential productivity and yield gap was limited. In the last ten-day of March, there were significantly negative correlations between accumulated sunshine hours and light-temperature potential productivities, yield gap, and the areas mainly distributed in Southwest and South Hunan. However, the accumulated temperature had wide effects on light-temperature potential productivity and yield gap, especially the limiting effects of high temperature. In the whole growth period, the last ten-day of March, and period from June to July, there were remarkable negative correlations between accumulated temperature and light-temperature potential productivity, yield gap in most areas of the province. In conclusion, affecting by climate change, the limiting effects of high temperature was strengthened, and the light-temperature potential productivity of spring maize was significantly reduced in Hunan Province. With the highest yield gap and the highest light-temperature potential productivity in west area of Hunan, there would be a large improvement space for spring maize yield.

Key words: Light-temperature potential productivity, Yield gap, High temperature, Spring maize

CLC Number:

LIU Si-hua, LI Jing, HUANG Wan-hua, WANG Tian-ying, LI Min-hua. Characteristics and Limiting Factors of Light-temperature Potential Productivity and Yield Gap of Spring Maize in Hunan Province[J]. Chinese Journal of Agrometeorology, 2020, 41(02): 94-101.

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