美国科学60秒 SSS 2012-12-28
时间：2013-06-25 08:59:29
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（单词翻译）
When autumn rolls around, the leaf peepers come out in force. Armed with digital cameras, they record the most spectacular displays of fall foliage1. Well according to a study in the journal Functional2 Ecology [Toshie Mizunuma et al., The relationship between carbon dioxide uptake and canopy3 colour from two camera systems in a deciduous4 forest in southern England], those images may be more than just pretty pictures. They may represent a new way to monitor climate change.
Trees take carbon dioxide, or CO2, from the atmosphere and convert it into biomass. By
sopping5 up CO2 they help to
stabilize6 the climate. But at the same time, they’re also
affected7 by climate, for example, budding earlier in the season as global temperatures rise.
To understand how all this balances out, ecologists monitor how forests take up CO2. It’s a
costly8 business that involves using a network of 500 instrument towers worldwide. So researchers got to wondering whether there might be an easier way to keep an eye on
photosynthesis9. And they found that digital cameras do the trick.
Analyzing10 two years’ worth of snaps taken every half hour in a forest in southern England, the researchers discovered that a tree’s leafy colors provide a good
proxy11 for its
photosynthetic12 productivity. So next time you go for a walk in the woods, take only photos. And leave only data points.
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