日韩精品久久一区二区三区_亚洲色图p_亚洲综合在线最大成人_国产中出在线观看_日韩免费_亚洲综合在线一区

Make me your Homepage
left corner left corner
China Daily Website

Scientists make land arable again

Updated: 2013-09-16 01:53
By Cheng Yingqi ( China Daily)

Scientists make land arable again

Since 2003, 20 million drought-enduring plants, including (clockwise from top left) Echinops sphaerocephalus, Poacyngrn hendersonii and Calligonum rubicundum, have been planted along the road. Photos by Hou Yiguo / for Chind Daily


However, in a desert that has annual precipitation of just 10 millimeters, "planting a tree and nurturing it to full growth is even more difficult than raising a child", Xu said.

Xu found seeds and plants that can survive in the bitter salt water under the sand, such as Chinese tamarisk, calligonum and Haloxylon ammodendron.

Since 2003, 20 million drought-enduring plants have been planted along the road, forming a 72-to 78- meter green belt.

The plants are irrigated by underground water pumped up 114 water wells. Compared to the cost of maintaining fences and barriers, irrigating the plants save some 30 million yuan ($4.9 million) every year.

The discoveries and applications of the desert plants is a lengthy process, according to Guan Kaiyun, director of the Turpan Eremophytes Botanic Garden.

"Our researchers working in the stations find the plants and seeds, and we are in charge of plant introduction and acclimatization, which sometimes takes more than a decade to finish," Guan said.

In the parched Turpan Basin sits the world’s only botanic garden of Asian desert flora. When a new plant is found, the samples are usually taken back to the garden, where scientists find ways to help the plants adapt to the new environment.

Spending four decades introducing and preserving desert plants, the botanic garden now has 700 different species, 50 of them endangered. Estimates put the number of plant species in the desert at about 5,000.

The plants also provide scientists with research opportunities.

One example Guan gives is Ammopiptanthus nanus, an endangered evergreen shrub in Xinjiang on which scientists recently extracted a protein that can combat deep cold.

"That protein explains the reason that Ammopiptanthus nanus survives the extreme low temperatures. And it’s worth further study because we might use it in genetically modified techniques in the future," Guan said.

Tian Changyan, deputy director of the Xinjiang Institute of Ecology and Geography, has devoted 10 years to finding the perfect plants that could improve the saline-alkali soil.

"Some plants can only grow in excessively saline soil. If we cultivate these plants on moderately saline soil, the plants will extract the salt out of the soil and improve its fertility," Tian said.

From 305 different salt-tolerant species, Tian identified six that were the most efficient. Experiments on a 67-hectare test field showed the plants were able to reduce the soil salt from 3 percent to less than 0.6 percent within three years.

"Compared to the old method of washing the saline soil with water, the plants are much more effective and sustainable," Tian said.

Scientists at the Xinjiang Institute of Ecology and Geography have devised a major project which could change the landscape forever. By 2020, the institute will build a gene bank of arid regional plants covering 10,000 plant species. Also, a world-class botanical garden is planned for Ili Kazak autonomous prefecture.

"The arid regional plants have excellent genetic features, so the genes are a significant strategic resource of the country," Guan said.

"The genes have great potential for our future development of agriculture, medicine and the military."

Previous Page 1 2 Next Page

8.03K
 
...
...
...
主站蜘蛛池模板: 毛片国产| 久久久久久综合一区中文字幕 | 女人一级毛片免费视频观看 | 国产亚洲精品精品国产亚洲综合 | 国产一区二区三区久久久久久久久 | 天天碰天天 | 欧美日韩专区国产精品 | 日韩免费福利视频 | 亚洲欧美日韩在线观看播放 | 日本三级2018亚洲视频 | 久久日本精品在线热 | 欧美一级毛片一 | 欧美成人一区二区三区在线视频 | 国产精品久久久久久久免费大片 | 国产日韩一区二区三区在线观看 | 久久综合丝袜长腿丝袜 | 欧美一区二区三区爽大粗免费 | 国产福利在线观看永久免费 | 久久草在线视频观看 | 特黄免费| 五月天婷婷在线视频国产在线 | 色九月 | 久久综合九色综合欧美狠狠 | 国产午夜精品理论片 | 亚洲欧美日韩一区二区在线观看 | 久草久草久草久草 | 国产视频一二区 | 成人a视频 | 色中色综合网 | 大香伊人久久精品一区二区 | 欧美日韩一区二区综合在线视频 | 日韩一区不卡 | 玖玖精品视频在线观看 | 91文字幕巨乱亚洲香蕉 | 天天操天天摸天天爽 | 日本高清免费在线视频 | 欧美性猛交一区二区三区精品 | 性做久久久久免费看 | 江苏少妇性BBB搡BBB爽爽爽 | 在线国产一区 | 天天操天天爱天天干 |