地理漫步·世界地理英语30篇（7）
22 / 30
正在确认阅读权限…
Permafrost Thaws as Temperatures Rise Globally
全球升温导致永久冻土融化
-
Permafrost is ground frozen solid for at least two years.永久冻土是指至少连续冻结两年的土壤。
-
It covers nearly one-quarter of land in the Northern Hemisphere.它覆盖了北半球近四分之一的陆地。
-
Thawing permafrost releases stored carbon and methane gases.冻土融化会释放其中储存的碳和甲烷气体。
-
Melting ground makes roads, buildings, and pipelines unstable.地面融化导致道路、建筑和管道变得不稳定。
-
New lakes form where ice-rich soil collapses after thawing.富含冰的土壤融化塌陷后，会形成新的湖泊。
-
Plant roots grow deeper as soil warms and softens.随着土壤变暖变软，植物根系向更深的地方生长。
-
Arctic ecosystems shift as shrubs replace tundra mosses.灌木取代苔原苔藓，北极生态系统随之改变。
-
Scientists monitor permafrost using satellite and ground sensors.科学家利用卫星和地面传感器监测冻土。