日批在线视频_内射毛片内射国产夫妻_亚洲三级小视频_在线观看亚洲大片短视频_女性向h片资源在线观看_亚洲最大网

US EUROPE AFRICA ASIA 中文
Business / Economy

Climate change offers pros, cons for grain supply

By Jin Zhu and Wang Qian (China Daily) Updated: 2012-12-24 07:33

As the world's most populous country, China recorded a grain output of 589 million metric tons in 2012, the ninth consecutive year of growth, according to the National Bureau of Statistics.

Tang Huajun, deputy dean of the Chinese Academy of Agricultural Sciences, said climate change may partly have a positive effect on the country's grain output if the global trend continues.

"A 3 to 11 percent increase in grain yields per unit is foreseeable from 2030 to 2050, considering the higher emission of greenhouse gases," he said, citing a mid-term research result from his academy.

The five-year research project, launched by the CAAS in 2010, is designated by governmental authorities to monitor the impact of climate change on grain production.

"But in the meantime, a series of negative effects caused by climate change - extreme weather, such as drought and flood, as well as plant diseases and insects - will pose increasing threats to grain supply security," said Tang, chief scientist for the five-year research project.

Agricultural professionals also warned that other great challenges, such as population growth and arable land loss, will have potentially grave effects on China's ambitious target of maintaining grain self-sufficiency.

The country's population is expected to peak at about 1.5 to 1.6 billion in 2030.

China's arable land may shrink to 105 to 111 million hectares in 2050, well below the current 122 million hectares, the bottom line for arable land set by the government to satisfy agricultural production, said Tang.

The prediction was based on government data on the urbanization rate and arable land from 1980 to 2005.

"Compared with strong negative effects of the rising population and shrinking arable land, favorable conditions due to climate change are quite limited to the country's food security," said Tang.

Tang suggested China introduce more new varieties of crops, for instance drought-resistant varieties, to plant in southern regions to cope with local climate change.

His research project will work to predict future changes in the country's planting locations due to climate change, especially for the three food staples of rice, wheat and corn.

Contact the writers at jinzhu@chinadaily.com.cn and wangqian@chinadaily.com.cn.

Previous Page 1 2 Next Page

Hot Topics

Editor's Picks
...
主站蜘蛛池模板: 国产成人免费在线观看视频 | 国产最新av | 欧美精品久久久久久久久老牛影院 | 最新中文字幕 | 四虎一区二区 | 国产精品视频一区二区三区不卡 | av高清一区二区 | 国产成人午夜高潮毛片 | 天堂资源站| 日韩国产中文字幕 | 欧美日韩一级二级 | 午夜免费激情视频 | www.涩涩爱| 国产欧美综合一区 | 999国产 | 久久久人 | 长河落日电视连续剧免费观看01 | 中文字幕在线观看视频网站 | 99热99精品| 黄色av免费在线 | 人人插人人草 | 欧美日韩www | 日韩在线欧美在线 | 四虎影视永久在线 | 精品视频亚洲 | 成人在线观看网址 | 国产精品自产拍在线观看 | 日本高清黄色 | 日韩中文在线字幕 | 四虎影院永久免费 | 久热中文字幕 | 国产精品一二三区 | 五月天黄色片 | 国产a级淫片 | 深夜福利一区二区三区 | 久久最新视频 | 五月婷综合| 日韩精品中文在线 | 久久久性视频 | 亚洲一区视频在线 | 久久精品偷拍视频 |