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Stunted growth rings from acid rain

Stunted growth rings from acid rain

E812/0036

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Credit

ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY. ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY.

Caption

Examination by the Forestry Commission in Freiburg West Germany of growth rings from the trunk of a Black Forest fir tree showing evidence of acid rain damage. Each ring is an expression of one year's growth & reflects the growing conditions over the period. The fir tree examined here shows a collapse of ring growth over the last 20 years (outer rings immediately beneath the bark). The rings are smaller & closer together than previous years (inner rings), indicating a stunted growth history. This is linked to acid rain pollution, the lowering of pH levels in rainfall due to sulfur dioxide emissions into the atmosphere.

Release details

Model release not required. Property release not required.

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