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

Global EditionASIA 中文雙語Fran?ais
China
Home / China / Environment

Fish species on brink of extinction as water quality declines

By Li Yang | China Daily | Updated: 2018-11-25 10:00
Share
Share - WeChat
Members of a Yangtze patrol seize fishing nets placed illegally in the river in Jinzhou, Hubei. [Liu Tao/For China Daily]

According to experts, excessive and disorderly development of water control projects has had the "gravest influence" on the waterway's ecology.

On June 19, the National Audit Office issued a report on the ecological environmental protection of the Yangtze River Economic Belt.

The report shows 24,100 small hydropower stations have been built along the streams and tributaries of the Yangtze in 10 provinces, of which 930 were completed before passing an environmental impact assessment. It also indicates that excessive development has caused runoffs to varying degrees in 333 rivers in the Yangtze drainage area.

Runoffs refer to the amount of precipitation on land that ultimately reaches streams often with dissolved or suspended material.

A national project proposed in the 1960s was launched in the '90s to transfer water and thermal power from western inland areas to coastal regions to meet the latter's fast-rising demand for electricity. Many hydropower stations were built in the '90s and early this century in the Yangtze's drainage area.

Cao said many of these power plants were built on second-or third-class tributaries, and the installed capacity at some is only hundreds of kilowatts.

The stations helped to alleviate the energy shortage in the 1980s and '90s. But there are so many of them that they often cause drastic changes to runoffs in the rivers.

"The income from power generation is probably not enough to cover the losses from ecological damage to the waters," Cao said.

Chen Yiyu, a research academician at the Chinese Academy of Sciences who studies aquatic species, told Caixin Magazine, "The problems include construction of water conservancy projects, disconnection of rivers and lakes, over-fishing, water pollution and invasion of alien species.

"The rich aquatic biodiversity of the Yangtze is closely related to the flood plain environment and seasonal flooding on the middle and lower reaches of the river. But human activities have changed all these factors."

Chen said there are more than 50,000 dams, of which 20,000 are hydropower stations, in the drainage basin of the Yangtze, and these have had a grave impact on the aquatic environment.

|<< Previous 1 2 3 4 5 Next   >>|
Top
BACK TO THE TOP
English
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
 
主站蜘蛛池模板: 一级黄色毛片视频 | 精品亚洲福利一区二区 | 蜜桃视频在线免费播放 | 亚洲无吗在线视频 | 日韩 第一页 | 日韩在线免费 | 国产成人精品一区在线播放 | 久久一本日韩精品中文字幕屁孩 | 国产 欧美 日本 | 天堂资源在线中文 | 亚洲一区二区三区免费视频 | 亚瑟天堂久久一区二区影院 | 一级午夜a毛片免费视频 | jiuse在线 | 一级在线观看 | 精品伊人久久 | 日本hdxxxxx护士免费的 | 亚洲一区二区三区免费在线观看 | 免费视频97碰碰碰在线观看 | 一区二区三区在线电影 | 午夜亚洲| 一级做a爰片久久毛片 | av在线看网站 | 亚洲精品久久久久久国产精华液 | 99je全部都是精品视频在线 | 久久久亚洲伊人色综合网站 | 国产高清性xxxxxxxx | 亚洲美女在线播放 | 啪一啪在线视频 | 欧美专区视频 | 久青草久青草高清在线播放 | 国产午夜亚洲精品一区 | 欧美爽爽爽高清免费视频 | 牛牛精品国内免费一区 | 狠狠久| 天天草人人草 | 久久午夜影视 | 日本中文字幕电影 | 黄色免费av | 欧美精品一区二区三区在线 | 草草视频手机在线观看视频 |