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Effects of forest fires and clear-cu...

Pinheiro, Fabiola Maria Rolan.

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Effects of forest fires and clear-cutting on mercury loading to boreal lakes.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Effects of forest fires and clear-cutting on mercury loading to boreal lakes./
作者:	Pinheiro, Fabiola Maria Rolan.
面頁冊數:	124 p.
附註:	Adviser: Alfonso Mucci.
Contained By:	Masters Abstracts International40-04.
標題:	Agriculture, Forestry and Wildlife. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=MQ64431
ISBN:	0612644316

Effects of forest fires and clear-cutting on mercury loading to boreal lakes.
Pinheiro, Fabiola Maria Rolan.

Effects of forest fires and clear-cutting on mercury loading to boreal lakes. - 124 p.

Adviser: Alfonso Mucci.

Thesis (M.Sc.)--McGill University (Canada), 2000.

In the soil, mercury species are predominantly associated with particulate organic carbon (POC) and can be exported with surface runoff by erosion or in solution, associated with dissolved organic carbon (DOC).

ISBN: 0612644316Subjects--Topical Terms:

783690
Agriculture, Forestry and Wildlife.

Effects of forest fires and clear-cutting on mercury loading to boreal lakes.
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245 1 0 $a Effects of forest fires and clear-cutting on mercury loading to boreal lakes.
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520 $a In the soil, mercury species are predominantly associated with particulate organic carbon (POC) and can be exported with surface runoff by erosion or in solution, associated with dissolved organic carbon (DOC).
520 $a Water column samples collected in September 1997 and May 1998 from three treatment groups of lakes (9 whose watershed was clear-cut, 9 whose watershed was burnt, and 20 control lakes, whose watershed forests have not been touched by forest fires or clear-cutting for at least 70 years) were analyzed. Results of these analyses reveal a significant increase in the DOC and dissolved methylmercury concentrations in lake water after watershed clear-cutting. Following forest fires, there is an enrichment of methylmercury in the suspended particulate matter (SPM), as well as significant losses of nitrogen species. Thus, watershed perturbations increase the export of mercury species from the catchment to drainage lakes, and this effect is greater in logged- than in burnt-watershed lakes. This mercury export is dependent on the delivery of POC and DOC to the lakes, which increases as a result of surface runoff intensification. (Abstract shortened by UMI.)
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