The forests of the world are not the stable and unchanging ecosystems they have been assumed to be. Without the occurrence of wide-spread disturbances in nature, such as forest fires, icing, or volcanic activity, forests will eventually be impoverished, owing to a lack of phosphorous.
This is shown in a study reported in this week’s issue of the journal Science. The scientists who carried out the investigation are David Wardle, Department of Forest Vegetation Ecology, Swedish University of Agricultural Sciences (SLU), Sweden, Richard Bardgett, University of Lancaster, U.K., and Lawrence Walker, University of Nevada, U.S.
The three researchers have examined soil profiles from forested land in six places around the world: in Arjeplog in Swedish Lapland, Alaska, Hawaii, Eastern Australia, and southern New Zealand (two locations). In all places there are soils of extremely varying age, from very young to several thousand years old. The oldest soil, in Hawaii, was 4.1 million years old.
Carin Wrange | alfa
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