Gerdol Renato, Bragazza Luca
Dipartimento delle Risorse Naturali e Culturali, Università di Ferrara, Corso Porta Mare 2, I-44100 Ferrara, Italy.
Chemosphere. 2006 Jul;64(5):810-6. doi: 10.1016/j.chemosphere.2005.10.053. Epub 2005 Dec 9.
We determined trace metal concentrations in mature living tissues of the moss Hylocomium splendens, at different altitude, in the south-eastern Alps of Italy. We hypothesized that if precipitation does not vary with altitude trace element concentrations in moss tissues will not be affected by altitude. Contrary to our hypothesis, element concentrations did vary with altitude even in the absence of any precipitation pattern related to elevation. In particular, concentrations of anthropogenic pollutants (especially Cd and Pb) peaked at mid altitude (1400-1800 m) where frequency of cloud cover was the highest. We concluded that the trace metal concentrations in alpine mosses can be regarded as a reliable estimate of total atmospheric deposition, i.e., including occult deposition by cloudwater. The latter may account for a significant fraction of the total deposition of anthropogenic trace metals, in close relation to cloud cover frequency.
我们测定了意大利东南部阿尔卑斯山不同海拔高度的成熟活体苔藓（尖叶泥炭藓）组织中的痕量金属浓度。我们假设，如果降水量不随海拔高度变化，苔藓组织中的微量元素浓度将不受海拔高度的影响。与我们的假设相反，即使在没有任何与海拔相关的降水模式的情况下，元素浓度也会随海拔高度而变化。特别是，人为污染物（尤其是镉和铅）的浓度在云层覆盖频率最高的中海拔（1400 - 1800米）处达到峰值。我们得出结论，高山苔藓中的痕量金属浓度可被视为大气总沉降的可靠估计值，即包括云水的隐蔽沉降。后者可能占人为痕量金属总沉降的很大一部分，与云层覆盖频率密切相关。
