时间:2019-01-13 作者:英语课 分类:VOA标准英语2012年(一月)


英语课

African Rainforests Continue to Face Challenges


The African continent contains about 30 percent of the world’s global rainforests, second only to the Amazon. Scientists and conservationists met at Oxford 1 University to discuss changes the forests are expected to undergo in the 21st Century.



Africa’s tropical forests face challenges from deforestation, hunting, logging and mining, as well as climate change.



“Climate change is a major issue for much of the world, but for Africa, in particular. And there’s much interest and concern around Africa’s forests, which is the second largest area of tropical forest in the world after the Amazon forest. And yet there’s been very little synthesis of the research that’s there. There’s much less known about both climate and forest and people and there interaction in Africa compared to many other regions of the world,” said Yadvinder Malhi is a professor of ecosystems 2 science at Oxford University and director of Oxford’s Center for Tropical Forests.



He said the conference brought together experts in climate change, ecology, social sciences, economics, anthropology 3 and archeology to discuss Africa’s rainforests.



“They’re important at an international level for many reasons. They hold a large amount of carbon. They seem to be absorbing carbon from the atmosphere, which is slightly slowing down the rate of climate change. In the case of Africa, the recycling of water. So water that falls in the Congo region gets taken up in the roots of trees and evaporated back into the atmosphere where it forms clouds and new rain,” he said.



The clouds that form over the Congo Basin actually have long range effects on water supplies and weather patterns in parts of Asia and even North America.



West and Central Africa



There’s a big difference between the forests of the Congo Basin and West Africa. Malhi says there’s been extensive deforestation in West Africa. Much of the land has been cleared for agriculture over the last 20 to 30 years.



“When we look at the Congo Basin we see a very different situation. That’s an area that is at the moment almost all intact forest and has had relatively 4 low rates of deforestation. And the reasons why those rates have been low are varied 5 from country to country. But in the largest area, the Democratic Republic, it’s been political instability and poor infrastructure 6 linked to that instability that has meant that this large forest reserve has not currently really faced very heavy pressure, at least compared to forests of Asia or the Amazon,” Malhi said.



However, he said that could change with new investment and infrastructure and expansion of industrial scale plantations 7.



About 3,000 years ago, the Congo forests were affected 8 by natural climate drying. Forests retreated and were replaced by grasslands 9.



“At the same time, around two and a half thousand years ago, Iron Age humans settled in much of the forest, cleared it with axes, with iron axes. And then they had a population collapse 10 around a thousand years ago and the forest regrew. And this is quite a different history from the history we see in the Amazon rainforest, where there’s been pretty continuous forest over human history and earlier. And also where there was human impact it was not with iron instruments. There was no Iron Age in the Amazon,” he said.



The combination of natural climate drying and the wide scale felling of trees resulted in fewer species of trees compared to other tropical forests. However, that’s not necessarily a bad thing.



“The species that are left seem to be relatively resilient to a large extent. They can recolonize disturbed areas quite quickly. They can spread quite quickly, regrow quite quickly. So if one area gets deforested, you can still find the species elsewhere,” he said.



Food Security



Modern day deforestation is often done to make room for agriculture. The U.N. says by 2050 the world population is expected to rise to nine billion. That means a much greater demand for food. But the Oxford professor says there are ways of meeting that demand that do not require widespread deforestation. One of them is making current agricultural land much more productive.



“Much of agriculture in Africa is of very low productivity. Very low inputs 11 of fertilizers and nutrients 12. You could have the current agricultural output of the Africa tropical forest region in 40 percent of its current agricultural land, leaving 60 percent of the land available for forests if the agriculture was intensified 13. So, it’s not a simple tradeoff between more food means more land and therefore less forests,” he said.



Malhi says once all the information from the conference is analyzed 14, recommendations will be made to governments, U.N. agencies and others. They’re expected to include proposals for protecting remaining rainforests, better land management for agriculture and new research into the effects of climate change.



The conference ran from January 4-6.



n.牛津(英国城市)
  • At present he has become a Professor of Chemistry at Oxford.他现在已是牛津大学的化学教授了。
  • This is where the road to Oxford joins the road to London.这是去牛津的路与去伦敦的路的汇合处。
n.生态系统( ecosystem的名词复数 )
  • There are highly sensitive and delicately balanced ecosystems in the forest. 森林里有高度敏感、灵敏平衡的各种生态系统。 来自《简明英汉词典》
  • Madagascar's ecosystems range from rainforest to semi-desert. 马达加斯加生态系统类型多样,从雨林到半荒漠等不一而足。 来自辞典例句
n.人类学
  • I believe he has started reading up anthropology.我相信他已开始深入研究人类学。
  • Social anthropology is centrally concerned with the diversity of culture.社会人类学主要关于文化多样性。
adv.比较...地,相对地
  • The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
  • The operation was relatively painless.手术相对来说不痛。
adj.多样的,多变化的
  • The forms of art are many and varied.艺术的形式是多种多样的。
  • The hotel has a varied programme of nightly entertainment.宾馆有各种晚间娱乐活动。
n.下部构造,下部组织,基础结构,基础设施
  • We should step up the development of infrastructure for research.加强科学基础设施建设。
  • We should strengthen cultural infrastructure and boost various types of popular culture.加强文化基础设施建设,发展各类群众文化。
n.种植园,大农场( plantation的名词复数 )
  • Soon great plantations, supported by slave labor, made some families very wealthy. 不久之后出现了依靠奴隶劳动的大庄园,使一些家庭成了富豪。 来自英汉非文学 - 政府文件
  • Winterborne's contract was completed, and the plantations were deserted. 维恩特波恩的合同完成后,那片林地变得荒废了。 来自辞典例句
adj.不自然的,假装的
  • She showed an affected interest in our subject.她假装对我们的课题感到兴趣。
  • His manners are affected.他的态度不自然。
n.草原,牧场( grassland的名词复数 )
  • Songs were heard ringing loud and clear over the grasslands. 草原上扬起清亮激越的歌声。 来自《现代汉英综合大词典》
  • Grasslands have been broken and planted to wheat. 草原已经开垦出来,种上了小麦。 来自《简明英汉词典》
vi.累倒;昏倒;倒塌;塌陷
  • The country's economy is on the verge of collapse.国家的经济已到了崩溃的边缘。
  • The engineer made a complete diagnosis of the bridge's collapse.工程师对桥的倒塌做了一次彻底的调查分析。
n.输入( input的名词复数 );投入;输入端;输入的数据v.把…输入电脑( input的第三人称单数 )
  • Uncheck the inputs checked for optimization in the previous stage. 不测试那些已经测试过的优化了的以前步骤的inputs.(变量参数)。 来自互联网
  • Just in case, save in a file the inputs obtained at the previous stage. 以防万一,保存以前步骤获得的inputs(变量参数值)到一个文件中去。 来自互联网
n.(食品或化学品)营养物,营养品( nutrient的名词复数 )
  • a lack of essential nutrients 基本营养的缺乏
  • Nutrients are absorbed into the bloodstream. 营养素被吸收进血液。 来自《简明英汉词典》
v.(使)增强, (使)加剧( intensify的过去式和过去分词 )
  • Violence intensified during the night. 在夜间暴力活动加剧了。
  • The drought has intensified. 旱情加剧了。 来自《简明英汉词典》
v.分析( analyze的过去式和过去分词 );分解;解释;对…进行心理分析
  • The doctors analyzed the blood sample for anemia. 医生们分析了贫血的血样。 来自《简明英汉词典》
  • The young man did not analyze the process of his captivation and enrapturement, for love to him was a mystery and could not be analyzed. 这年轻人没有分析自己蛊惑著迷的过程,因为对他来说,爱是个不可分析的迷。 来自《简明英汉词典》
学英语单词
aft-cabin
after-dripping
airconditioned
alternate segregation
automatic equalization
basio-
birdskin
bleeding-edge
bravais law
Breuches
broom rape
carpindolol
carrion beetle
catalyst layer
centi
cerebral tumor
circumferential rib
cost of renovation
Dalysep
desynonymizations
difference of arcing time
distant repeater
donkeyback
downslope
eccentric increaser
eeigs
electronic contactor
elliptic integral of the first kind
equation of state for tension
equine virus rhinopneumonitis
exert every effort
financial supports
flavonoids
foreign patent
friction circle analysis
glycylcyclin
go the bundle on
gravid emphysema
hakan
Hanover County
head-coaching
heteromorphic multinucleate
high frequency testing apparatus
higher dimentional space
honorableness
house-break
hypobasidiums
i-athele
INTCON
interchromosomal
invarable effect
karpathite
Koranyi's method
kuehn
Laogong (P8)
Laverack
LCDC
log out
machosexual
mass work
maungy
nmed
omentocele
overprotecting
packhorse bridges
Paruro
phallic shield
platen press
prashant
prevention action
public transport junction
put one's hand to the plough
quadripaschal
quick response exciter
rabbit-eared bandicoot
rise of blocks
rodkin
satellite industry
saucerman
seesters
set-in bridge
sev
slow axis
Soft words butter no parsnips.
sound effects library
space division switching system
spherular
standard meridian
swimmeret
synovitic
Tarullo
Thermoproteaceae
thoracic nerves (or dorsal spinal nerves)
triethyleneglycol
ulnar border
unknowns
ust-olen?k
Weber's operation
wedding picture
weepiness
working parameter
yoof