首页
登录
职称英语
As the earth’ s surfaces warm, evaporation(蒸发)is drying out forests and soil
As the earth’ s surfaces warm, evaporation(蒸发)is drying out forests and soil
游客
2023-07-05
42
管理
问题
As the earth’ s surfaces warm, evaporation(蒸发)is drying out forests and soils, increasing susceptibility to fire. Last summer, more than 7.3 million acres of U.S. forests burned during an intense drought. Most alarmingly, as an intergovernmental panel concluded in 2001, earth’ s biological systems are already responding to climate change. The current epidemic(传染病)of bark beetles adds a new dimension to the risk of fires.
Mountain bark beetles attack lodgepole, ponderosa(黄松), Douglass fir(枞木), sugar and western white pines, destroying them by injecting a fungus(真菌). The galleries of eggs they lay inside the bark pave the way for the trees’ death within a year. Healthy trees secrete pitch to drown the invaders and plug the holes they bore, but drought dries out the pitch. Woodpeckers and nuthatches keep adult numbers in check, but with warmer winters, beetle populations can quadruple in a year, outpacing their pursuers.
Warming is increasing the reproduction, abundance and geographic range of beetles, destabilizing the age-old, hard won truce between insects and vegetation. Since 1994, mild winters in Wyoming have helped the beetle larvae(幼虫)survive the season. Usually, 80 percent die, but the mortality rate has dropped to less than 10 percent. In Alaska, spruce bark beetles are sneaking in an extra generation a year due to warming, and have destroyed 4 million acres in the Kenai Peninsula in the past five years. "This is another example of global climate change that has deadly implications for my state," declared Alaska’s Republican Sen. Ted Stevens last year.
Warming is also expanding the beetles’ range into higher altitudes. In the past four or five years, they have begun to attack whitebark pines at an elevation of 8,000 feet or higher. Jesse Logan, who works for the Utah Forest Service, told the Billings(Mont.)Gazette last month that this development coincides with an overall wanning trend that began in the 1980s. "Beetles are cold-blooded, so their metabolism is related to the environment they’re in," according to Logan, who said the beetles seem to be a reliable indicator of global climate change. [br] What is the relationship between bark beetles and climate change?
选项
A、More and more bark beetles die due to global wanning.
B、Bark beetles have more risk of dying in warming winters.
C、Global warming causes an increase in the number of bark beetles.
D、There is no relation between them.
答案
C
解析
细节题。从上题的解析中可以看出,气候变暖对于这种害虫的繁衍有利.暖冬可以使他们的死亡率降低,故A、B、D错误。他们的关系是变暖可以导致害虫数量的增长。
转载请注明原文地址:https://tihaiku.com/zcyy/2811629.html
相关试题推荐
[originaltext]Mostrainforestslieclosetotheequator,wheretheclimate
[originaltext]Mostrainforestslieclosetotheequator,wheretheclimate
Astheearth’ssurfaceswarm,evaporation(蒸发)isdryingoutforestsandsoil
Astheearth’ssurfaceswarm,evaporation(蒸发)isdryingoutforestsandsoil
Astheearth’ssurfaceswarm,evaporation(蒸发)isdryingoutforestsandsoil
Astheearth’ssurfaceswarm,evaporation(蒸发)isdryingoutforestsandsoil
Astheearth’ssurfaceswarm,evaporation(蒸发)isdryingoutforestsandsoil
Astheearth’ssurfaceswarm,evaporation(蒸发)isdryingoutforestsandsoil
Astheearth’ssurfaceswarm,evaporation(蒸发)isdryingoutforestsandsoil
Astheearth’ssurfaceswarm,evaporation(蒸发)isdryingoutforestsandsoil
随机试题
WhatpositionwillWongapplyfor?[br]WhatdidWongdobeforeshewasexternal
阴茎癌A.通常经深部盆腔静脉转移 B.罕见于婴儿期已做包皮环切的男性 C.侵
现金流量表反映房地产项目开发经营期内各期的资金盈余或短缺情况,用于选择资金筹措方
1999-117.患者咳喘胸闷,痰多白沫样,甚则颜面肢体浮肿,两天前着凉后加重
在进行个人住房贷款的贷前调查时,对开发商及楼盘项目的调查不包括()。A.对开发
(2018年真题)上海期货交易所的期货交易品种有()。A.铜 B.大豆
涎石病临床表现不包括( )。A.导管口黏膜红肿 B.可触及导管内硬块 C.
集装箱运价是指适用于集装箱运送的货物运价,一般有两种形式:一是单独制定的运价,二
根据我国《预算法》的规定,不属于全国人民代表大会常务委员会负责的是()。A、监督
男,35岁,腹痛、反酸10年。1周来症状加重,并出现夜间痛,进食能部分缓解。
最新回复
(
0
)