Acid rain not only to blame

Article Abstract:

Prehistoric agricultural society has been proven just as guilty in causing changes to the chemistry of lakes in Sweden. Although the changes resulting from agricultural practices of the past were minimal, the study demonstrated that land use plays a significant role in controlling lake chemistry. I. Renberg and associates showed evidence that surface water pH was affected by variations in land use. In particular, Renberg and colleagues proved that alkalinity increased when forest land was converted into agricultural land and acidification occurred when agricultural practices were abandoned.

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Role for heavy metals in forest decline indicated by phytochelatin measurements

Article Abstract:

Heavy metal pollutants are a cause of tree damage in US. The concentration of phytochelatins in trees is greater at higher altitudes and in areas of the Northeastern US where there has been significant tree damage. Phytochelatins are intracellular metal-binding peptides that indicate metal stress. The phytochelatin level is high in red spruce which is in decline, as compared to balsam fir which is undamaged.

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Valuation of consumption and sale of forest goods from a Central American rain forest

Article Abstract:

Research is presented concerning the value received by the local population for each hectare of rain forest in eastern Honduras. The value of forest goods sold by the Tawahka Amerindians ranged from US$17.79 to US$23.72 per hectare.

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