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Is rainfall a greater threat to China's agriculture than warming?
Date:4/4/2012

New research into the impact of climate change on Chinese cereal crops has found rainfall has a greater impact than rising temperature. The research, published in the Journal of the Science of Food and Agriculture found that while maize is sensitive to warming increases in temperature from 1980 onwards correlated with both higher and lower yields of rice and wheat.

The study was carried by Dr. Tianyi Zhang, from the Institute of Atmospheric Physics, and Dr. Yao Huang, from the Institute of Botany, both at the Chinese Academy of Sciences. The paper is part of a special collection of free articles on the links between climate change, agriculture and the function of plants.

"China has experienced significant climate change over the last century", said Zhang. "The annual mean air temperature increased by 1.1 C from 1951 to 2001, rainfall in Western China increased by up to 15% per decade and decreased in the North."

"Projections from climate models predict that mean temperature could rise by 2.3-3.3 C by 2050 while rainfall could increase by 5-7%," said Huang. "This could have a major impact on China's agriculture which accounts for 7% of the world's arable land but feeds about 22% of the global population."

The authors turned to China's provincial agricultural statistics and compared the data to climate information from the China Meteorological Administration. They focused their analysis on China's main cereal crops, rice, which is grown throughout China, as well as wheat and maize, which are mainly grown in the North.

The results show a significant warming trend in China from 1980 to 2008 and that maize is particularly sensitive to warming. However, they also found that rising temperature collated with both higher and lower wheat and rice yields, refuting the thoughts that warming often results in a decline in harvests.

"Of the three cereal crops, further analysis suggested that reduction in yields w
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Contact: Ben Norman
lifesciencenews@wiley.com
44-124-377-0375
Wiley-Blackwell
Source:Eurekalert

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