Examination of growth rings
Numéro d’image : 11749873
| 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 | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Hart-Davis, Adam |
| Taille de l’image : | 4018 px × 2657 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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