地理漫步·世界地理英语30篇（4）
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The Great Plains: Grasslands Between Two Climates
大平原：夹在两种气候之间的草原
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The Great Plains stretch from Canada to Texas, covering over 2.5 million square kilometers.
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They lie in the rain shadow of the Rocky Mountains, receiving just 25–75 cm of rain yearly.
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Native tallgrass prairies once supported bison herds, prairie dogs, and fire-adapted plants.
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Modern wheat farming depends heavily on Ogallala Aquifer groundwater, now declining rapidly.
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Wind erosion surged during the 1930s Dust Bowl when plowing removed protective sod.
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Conservation tillage and cover cropping now reduce soil loss by over 60% in key counties.
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Tornado alley forms where cold dry air from Canada meets warm moist Gulf air.
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Grassland bird populations have dropped 50% since 1970 due to habitat fragmentation.
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Prairie restoration projects reintroduce native forbs and grasses using prescribed burns.
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Farmers join regional networks to share data on soil moisture and weather forecasts.