首页
登录
职称英语
Conventional wisdom says trees are good for the environment. They absorb car
Conventional wisdom says trees are good for the environment. They absorb car
游客
2024-08-22
6
管理
问题
Conventional wisdom says trees are good for the environment. They absorb carbon dioxide—a greenhouse gas—from the atmosphere and store it as carbon while releasing oxygen, a process for which forests have been called "the lungs of the planet". The roots of trees have been thought to trap sediments and nutrients in the soil. Trees have also been credited with steadying the flow of these rivers, keeping it relatively constant through wet and dry seasons, thus preventing both drought and flooding. It is all nonsense, concludes a research published this week. A four-year international study led by researchers at the University of Newcastle, in Britain, and the Free University of Amsterdam, identifies several myths about the link between forests and water. For example, in arid and semiarid areas, trees consume far more water than they trap. And it is not the trees that catch sediments and nutrients, and steady the flow of the rivers, but the fact that the soil has not been compressed.
The World Commission on Water estimates that the demand for water will increase by around 50% in the next 30 years. Moreover, around 4 billion people—one half of the world’s population— will live in conditions of severe water stress, meaning they will not have enough water for drinking and washing to stay healthy, by 2025.
The government of South Africa has been taking a tough approach to trees since it became the first to treat water as a basic human right in 1998. Trees lose water through evaporation(the technical term is transpiration)at twice the rate of grassland or South Africa’s unique fynbos scrubland. In a scheme praised by the hydrologists, the state penalizes forestry companies for preventing this water from reaching rivers and underground aquifers.
In India, large tree-planting schemes not only lose valuable water but complicate the true problem identified by the hydrologists: the unregulated removal of water from aquifers to irrigate crops. Farmers need no permit to drill a borehole and, as most farmers receive free electricity, there is little economic control on the volume of water pumped. In the Kolar district in Karnataka, wells have dried up as the water table has plummeted from six metres to 150 metres below ground.
Questions 71—75
Complete the summary with a maximum of two words from the passage, changing the form where necessary.
It is commonly believed that trees are good for the environment, as they absorb carbon dioxide and release oxygen: the roots of trees can trap water and【R1】______ the flow of rivers. However, a recent study has found that this belief is【R2】______.
According to the research, trees lose【R3】______ water through evaporation than they trap. In South Africa, forestry companies are punished as the trees they planted prevented water from【R4】______ rivers and underground aquifers. In India, farmers drilled many wells and used the underground water to【R5】______their farmland. This has lowered water table to 150 metres below ground. Many trees have been planted and in fact these trees complicate the existing problem. [br] 【R3】
选项
答案
(far)more
解析
由文章可知树木有时消耗的水分比所留下的多得多。
转载请注明原文地址:https://tihaiku.com/zcyy/3730169.html
相关试题推荐
Conventionalwisdomsaystreesaregoodfortheenvironment.Theyabsorbcar
Conventionalwisdomsaystreesaregoodfortheenvironment.Theyabsorbcar
Conventionalwisdomsaystreesaregoodfortheenvironment.Theyabsorbcar
Conventionalwisdomsaystreesaregoodfortheenvironment.Theyabsorbcar
Conventionalwisdomsaystreesaregoodfortheenvironment.Theyabsorbcar
Conventionalwisdomsaystreesaregoodfortheenvironment.Theyabsorbcar
Conventionalwisdomsaystreesaregoodfortheenvironment.Theyabsorbcar
Conventionalwisdomsaystreesaregoodfortheenvironment.Theyabsorbcar
Conventionalwisdomsaystreesaregoodfortheenvironment.Theyabsorbcar
Conventionalwisdomsaystreesaregoodfortheenvironment.Theyabsorbcar
随机试题
Aperson’shomeisasmuchareflectionofhispersonalityastheclotheshe
Easteriscelebratedeveryspring.IiisalwayscelebratedonaSunday.Eas
QuestionnaireDesignI.Clarifyyourstudygoal—Writedownyourstudygoalbef
信用评分模型是分析借款人信用风险的主要方法之一.下列各模型不属于信用评分模型的是
在公司信贷产品组合策略中的特殊产品专业型策略的特点是( )。A.产品组合的宽度
除合伙企业另有约定外,合伙企业的下列事项应当经全体合伙人一致同 意才可通过的有
最早提出“什么知识最有价值”这一经典课程论命题的学者是()。 A.夸美纽斯
A.μ<0.5 B.0.5<μ<0.7 C.0.7<μ<2 D.μ>2
卫星电视接收系统中,将卫星天线收到的微弱信号进行低噪声放大、变频的设备为()。
无痛性黄疸伴胆囊增大最可能是A.十二指肠乳头炎 B.胆道蛔虫病 C.壶腹周围
最新回复
(
0
)