Ancient trees in Amazonia

Article Abstract:

C-dating reveals that trees in central Amazon rain forests can be more than 1,400 years old. Research into the distribution of ages between a number of large emergent trees in the central Amazon involved C-dating 20 trees from 13 species harvested in a 80,000-ha logging operation. There were close links between tree size and age, but most variability was explained by other factors. Long-term average growth was closely connected with age in a nonlinear relationship.

Natural history, Growth, Amazon River region, Trees, Trees (Plants), Rain forest ecology

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Mineral control of soil organic carbon storage and turnover

Article Abstract:

Research using radiocarbon isotopes shows that metastable, non-crystalline minerals affect the level, turnover and ecology of the organic carbon in soil. Soil mineralogy analysis indicates that the build-up and break-down of organic matter in soil around 4,100,000 years ago was significantly controlled by mineral-stabilized carbon. Organic carbon levels may have been affected by passive (mineral-stabilized) soil carbon.

Soils, Composition, Carbon, Carbon isotopes, Soil mineralogy

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Carbon sink for a century

Article Abstract:

Issues are presented concerning the growing importance of maintaining large forests as reservoirs for carbon as land-use activities and fossil-fuel combustion results in increasing levels of carbon dioxide in the atmosphere.

Environmental aspects, Forests and forestry, Forests, Atmospheric carbon dioxide

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