首页
登录
职称英语
Exotic insect pests can produce both short-and long-term effects on forest e
Exotic insect pests can produce both short-and long-term effects on forest e
游客
2025-02-19
7
管理
问题
Exotic insect pests can produce both short-and long-term effects on forest ecosystems. Short-term effects include the disturbances directly associated with the action of the pest, which may cause the defoliation, loss of vigor, or death of trees. Long-term effects involve changes in tree species composition and the consequent alterations of forest structure, productivity, and nutrient uptake. Exotic pests are more efficient than most abiotic disturbances (e.g., fire or wind) at producing long-term changes in species composition. Pests often target specific tree species and, if they become established, they usually remain as permanent components of the ecosystem. Shifts in forest species composition ramify through the ecosystem in many ways because tree species have different, often
unique properties
. [br] The passage mentions which of the following as effects of exotic pests on forest ecosystems?
选项
A、Decreased vitality in trees
B、Defoliation of trees
C、Changes in forest structure
答案
A,B,C
解析
A项对应短期影响。B项对应短期影响。C项对应长期影响。
转载请注明原文地址:https://tihaiku.com/zcyy/3964066.html
相关试题推荐
Exoticinsectpestscanproducebothshort-andlong-termeffectsonforeste
Ourterrestrialfoodsupplycomesfromecosystemstransformedtoproduceaf
Seedingaforestwithnonnativespeciesafterafirecanimpedenativeplant
Seedingaforestwithnonnativespeciesafterafirecanimpedenativeplant
TosavetheAmazonrainforestfromdestruction,itisnecessarytofindac
Whateffectscanstresshaveonourworkandlife? Ithinkstressmayhaveboth
Arethereanynegativeeffectsofworkinglonghours? Yes,definitely,there’re
Thediagramillustrateshowpaperisproducedandhowusedpapercanberecyc
Somepeoplethinkthatexaminationshavesomebadeffectsonstudents.Some
Somepeoplesaythatgivingaidtopoorcountrieshasmorenegativeeffects
随机试题
Yesterdaymyauntboughtsomenew______forherflatattheseaside.A、furnitureB
不是阿尔瓦阿尔托作品的是( )。A.巴黎大学瑞士学生宿舍 B.帕米欧肺病疗养
反映药物吸收进入血液循环系统后药物浓度随时间变化过程的是()。A.血药浓度-时
保险人对所承担的医疗保险金的给付责任所带有的限制或制约性条款包括()。 A.
一绳缠绕在半径为r的鼓轮上,绳端系一重物M,重物M以速度v和加速度a向下运动(如
假定某砂性地层坑开挖降水过程中土体中的稳定渗流是二维渗流,可用流网表示,关于组成
胃窦癌行胃癌根治性切除后,如果在结肠前作胃空肠吻合术时,一般要求近端空肠段离Tr
对于分离交易的可转换公司债券,认股权证自发行结束至少已满()个月起方可行权,行权
下列光缆的施工要求,错误的是( )。A.敷设光缆时,其最小动态弯曲半径应大于光
DNA的一级结构是指() A.多聚A结构 B.核小体结构 C.双螺旋结构
最新回复
(
0
)