国产热热热精品,亚洲视频久久】日韩,三级婷婷在线久久,99人妻精品视频,精品九热人人肉肉在线,AV东京热一区二区,91po在线视频观看,久久激情宗合,青青草黄色手机视频

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
...
江门市| 黑龙江省| 宜宾市| 台东县| 黔东| 华池县| 岗巴县| 沅陵县| 东乡县| 文安县| 西和县| 茌平县| 商都县| 绥阳县| 古田县| 板桥市| 泾源县| 高陵县| 宁国市| 乳源| 溆浦县| 河北区| 邵阳县| 繁峙县| 五华县| 天津市| 泗水县| 天峻县| 南通市| 天峨县| 伊通| 泉州市| 贵阳市| 武安市| 铅山县| 思茅市| 繁峙县| 泌阳县| 彭山县| 岳普湖县| 镇平县|