气候、灌木和驯鹿（欢迎打卡） | NSF 今日图说

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阿拉斯加树木的年轮揭示了气候对灌木生长的影响，从而也反应出了气候对北极苔原生态系统的总体影响。一组科学家不辞辛劳地用显微镜测量了 20000 个不同的灌木环，建立起了阿拉斯加北部灌木生长的历史记录。接着，这组科学家把这些生长记录和气候观测进行了对比，研究了降水、温度和太阳辐射等因素。一位研究人员表示，大的灌木似乎能使一些动物受益，比如驼鹿和雷鸟，但也会伤害到诸如驯鹿这样的动物。图片显示：六月气温升高会促进苔原植被现象的发生，对驯鹿等野生动物产生负面影响。

Plant -- and climate -- versus animal

Annual tree rings in Alaska have revealedclues into the impacts of climate on shrub growth, and thereby on Arctic tundraecosystems in general. After painstakingly measuring 20,000 individual shrubrings through a microscope, a team of scientists created records of historicshrub growth from across northern Alaska. Next, the team compared these growthrecords to climate observations, examining factors like precipitation,temperature and solar radiation. According to one researcher, larger shrubsappear to benefit some animals, like moose and ptarmigan, but harm otheranimals, such as caribou. Shown here: Evidence of how warmer June temperaturesdrive shifts in the tundra vegetation in northern Alaska, negatively impactingwildlife such as caribou.

Image credit: Daniel Ackerman

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