Warming is also reinforced when shrubs move northward and replace lower tundra plants.

气候变暖的另一铁证是灌木北移取代了苔原植物。

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Based on warming experiments using greenhouses, biologists have known for some time that shrubs will grow at the expense of the other tundra plants when the climate warms.

透过在温室进行的暖化实验，生物学家已经知道：当气候温暖，灌木会在苔原植物受损时取而代之。

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Investigation on pollen grains of tundra plants can provide significant data for comparative study of fossil pollen and for reconstruction of paleovegetation and paleoclimate in the Barrow area.

这些冻原植物花粉形态的研究为恢复北极地区古植被和古气候的研究，提供了有价值的对比资料和依据。

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Warmer conditions on the tundra trigger a cascade of change, including converting its lush but short green carpet into a taller shag, since warmer soils and deeper thaw enable taller, woody plants to grow and thrive on the tundra.

CNN: Next global warming worry: Thawing tundra