Observations sur la scnsibilité aux gaz fluorés de quelques espèces végétales du Valais

Bolay, A.; Bovay, E.

doi:10.1111/j.1439-0434.1965.tb02205.x

Cited by 9 publications

(3 citation statements)

References 4 publications

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“…Between the 1920s and the early 1980s, scientific investigations on Scots pine decline in the Valais largely focused on fluorine emissions of nearby aluminum smelters that were built in 1907 in Martigny, 1908 in Chippis, andlater, 1962 in Steg (Figure 1) (Faes 1921;Wille 1922;Bolay and Bovay 1965;Flü hler 1981;Kontic and others 1986). Damage to Scots pine trees was shown to be greatest downwind (west-east) of pollution sources (Flü hler 1983) and in the zone of atmospheric inversions (Kontic and others 1986).…”

Section: Possible Causes Of Scots Pine Declinementioning

confidence: 99%

“…Damage to Scots pine trees was shown to be greatest downwind (west-east) of pollution sources (Flü hler 1983) and in the zone of atmospheric inversions (Kontic and others 1986). Scots pine is assumed to be one of the most sensitive conifers with regard to the impact of acid deposition and air pollutants (Bolay and Bovay 1965;Richardson and Rundel 1998).…”

Section: Possible Causes Of Scots Pine Declinementioning

confidence: 99%

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Drought as an Inciting Mortality Factor in Scots Pine Stands of the Valais, Switzerland

et al. 2006

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During the 20th century, high mortality rates of Scots pine (Pinus silvestris L.) have been observed over large areas in the Rhô ne valley (Valais, Switzerland) and in other dry valleys of the European Alps. In this study, we evaluated drought as a possible inciting factor of Scots pine decline in the Valais. Averaged tree-ring widths, standardized tree-ring series, and estimated annual mortality risks were related to a drought index. Correlations between drought indices and standardized tree-ring series from 11 sites showed a moderate association. Several drought years and drought periods could be detected since 1864 that coincided with decreased growth. Although single, extreme drought years had generally a short-term, reversible effect on tree growth, multi-year drought initiated prolonged growth decreases that increased a tree's long-term risk of death. Tree death occurred generally several years or even decades after the drought. In conclusion, drought has a limiting effect on tree growth and acts as a bottleneck event in triggering Scots pine decline in the Valais.

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Section: Possible Causes Of Scots Pine Declinementioning

confidence: 99%

Section: Possible Causes Of Scots Pine Declinementioning

confidence: 99%

Drought as an Inciting Mortality Factor in Scots Pine Stands of the Valais, Switzerland

et al. 2006

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“…Trace amounts of injury have been reported when leaf concentrations were as low as 15 ppm. 10 Leaves can fluctuate in fluoride content due to rain and other factors. Samples collected at one time may differ considerably from those collected a few days earlier or later.…”

Section: Vegetation Fluoride Contentmentioning

confidence: 99%