www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

US EUROPE AFRICA ASIA 中文
China / Society

Plants used to weed out soil pollution

By Cheng Yingqi (China Daily) Updated: 2014-04-18 01:53

Chinese scientists have developed soil remediation technologies to prepare for large-scale applications.

The technologies focus on using plants to absorb heavy metal contaminants in soil.

The technologies were developed by the Center for Environmental Remediation of the Institute of Geographic Sciences and Resources Research under the Chinese Academy of Sciences, which began research 10 years ago.

Soil contamination is serious in China, with large areas of cropland polluted, said Lei Mei, a professor at the center.

Soil remediation technologies have been applied on 133 hectares of land in the Guangxi Zhuang autonomous region, Henan, Yunnan and Hunan provinces and Beijing on a trial basis, and Lei said she believes the technologies will have "good application prospects".

A report from the Ministry of Environmental Protection on Thursday showed that about 19.4 percent of farmland in China was polluted, according to Xinhua News Agency.

"The publication of the survey result is a milestone for soil remediation in China," Lei said.

Before the release of the survey results on Thursday, the latest official data available was released by the Ministry of Land and Resources in 2006. That report said that about 7 percent, or 10 million hectares, of arable land in China was contaminated by heavy metals.

By 2009, the country had 135.38 million hectares of arable land.

In 2005, scientists from the center proved in the laboratory that the plant Pteris vittata, or Chinese brake fern, had cleansing abilities when planted in soil polluted by heavy metals such as lead, zinc, sulfur and arsenic.

After the fern becomes saturated with heavy metals from the polluted soil, the aboveground part of the plant is cut off and burned. A new shoot grows from the root, and the process is repeated.

Field experiments since 2010 on 60 hectares of polluted land in Hechi, Guangxi Zhuang autonomous region, showed the plant can reduce heavy metals by 10 percent a year, which means it can help reduce pollutants to safe levels within three to five years.

The scientists have promoted planting of the fern among local farmers. The ferns are intercropped, or grown in the same fields, as cash crops such as flax.

Meanwhile, scientists are developing a new passivator, which is a coat with an oxide layer that protects against heavy metal contamination of the soil.

Liu Wenhua, chief engineer of the Guangdong province Research Center for Geoanalysis, recently developed a new passivator that could reduce cadmium, lead, copper and zinc in soil.

Highlights
Hot Topics
...
主站蜘蛛池模板: 久久久久久青草大香综合精品 | 激情午夜天| 最新国产精品亚洲 | 亚洲美女在线观看播放 | 色18美女社区| 国产日产欧美精品一区二区三区 | 在线观看人成网站深夜免费 | 欧美精品成人一区二区在线观看 | 国产婷婷一区二区在线观看 | 国产成人18黄网站免费网站 | 日本一级特黄特色大片免费视频 | 在线a人片免费观看国产 | 亚洲乱码一区二区三区国产精品 | 一区二区三区高清视频在线观看 | 欧美三级一级片 | 白嫩美女一级毛片免费看 | 亚洲一级毛片免费观看 | 美女亚洲综合 | 日韩美女网站 | 国产精品视频永久免费播放 | 国产欧美亚洲精品a | 99视频在线观看免费视频 | 欧美日本高清 | 久久香蕉精品视频 | 国产精品高清全国免费观看 | 久久久免费网站 | 日韩在线观看一区 | 成年女人免费视频播放成年m | 呦女精品视频 | 91精品国产综合久久久久久 | 农村寡妇女人一级毛片 | 美女毛片在线看 | 亚洲成aⅴ人片在线影院八 亚洲成av人片在线观看 | 中国国产一国产一级毛片视频 | 国产一级不卡毛片 | 99精品欧美| 免费看欧美毛片大片免费看 | 最近中文字幕免费视频 | 国产一区二区在线看 | 日韩一区二区三区在线免费观看 | 久久久精品影院 |