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Seeing the Forest Under the Trees
![dead maple leaves on the forest floor.](/news/mmg/media/images/acid_rain1_f.jpg)
Ecologists found a new effect of acid rain: Too many dead leaves on the forest floor.
Credit: NPS
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![a sugar maple forest in the northern United States.](/news/mmg/media/images/acid_rain2_f.jpg)
A long-term experiment continues on sugar maple forests in the northern U.S.
Credit: Sierra Patterson and Alan Talhelm
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![a forest floor in a maple forest with red, yellow and blue tags on stakes.](/news/mmg/media/images/acid_rain3_f.jpg)
Acid rain affects vast maple areas; it slows the process of leaf decomposition.
Credit: Sierra Patterson and Alan Talhelm
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![sugar maple leaf litter.](/news/mmg/media/images/acid_rain4_f.jpg)
Heavy leaf litter: Not a good sign for sugar maples; new seedlings can't get through.
Credit: NPS
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![Photo of a scientist sampling atmospheric nitrogen deposition from acid rain on the forest floor.](/news/mmg/media/images/acid_rain5_f.jpg)
Scientists study atmospheric nitrogen deposition from acid rain and its effects on forests.
Credit: Sierra Patterson and Alan Talhelm
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![a sugar maple forest.](/news/mmg/media/images/acid_rain6_f.jpg)
A lovely stand of sugar maples, but for how long? The next generation is threatened.
Credit: Sierra Patterson and Alan Talhelm
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