Impact of climate on grain yield per unit area in China during the years of 1949–1992 |
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Authors: | Xie Yun and Liu Jidong |
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Institution: | (1) The Department of Resource and Environmental Science, Beijing Normal University, 100875 Beijing, P. R. China |
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Abstract: | The grain yield per unit area in China has been increasing from 1949 to 1992 with annual fluctuations, which was caused by
both policies and monsoon climate. The total grain yield is divided into trend yield, which reflects the influence of economic
factors, and climate yield, which reflects the impact of climate factors. The results of grain and climate yield by EOF (empirical
orthogonal function) method show that the grain yield in the eastern China is higher and more fluctuating than that in the
western region. The spatial and temporal distributions of climate yield were divided into four patterns. Regional unanimity
of climate-yield variation is the first and main spatial pattern, and then there are the spatial patterns of north-south difference
and east-west difference in some years. Generally, climate conditions are good for grain yield during the 1950s and 1980s
all over the country.
Supported by the National Natural Science Fundation of China. |
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Keywords: | grain yield climate yield empirical orthogonal function spatial and temporal distribution |
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