地理漫步·世界地理英语30篇（1）

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刚果河径流量与雨林蒸散

The Congo River carries the world’s second-largest average discharge, yet its basin receives less rainfall than the Amazon does.
This seeming paradox occurs because dense rainforest canopy recycles water constantly through evapotranspiration.
Trees absorb groundwater and release vapor daily—up to 80% of regional precipitation originates from forest transpiration.
As moist air rises, it cools and condenses, causing frequent afternoon thunderstorms that refill rivers year-round.
Without this green pump, dry seasons would be longer and river levels could drop by 30% or more.
Deforestation disrupts this cycle, reducing local rainfall and increasing surface runoff that erodes fertile topsoil.
Hydrologists use satellite data to track how evapotranspiration rates change when logging expands near tributaries.
Even though the Congo Basin covers only 3% of Earth’s land, it holds 15% of its tropical forest carbon.
River gauges show stable flows during drought years—proof that intact forests buffer hydrological extremes.
Conserving this ‘breathing forest’ remains vital not just for wildlife, but for continental-scale water security.