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Atmospheric Input of Phosphorus to Remote Tropical Islands

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Title: Atmospheric Input of Phosphorus to Remote Tropical Islands
Authors: Graham, William F.
Duce, Robert A.
Issue Date: Jul 1981
Publisher: University of Hawai'i Press
Citation: Graham WF, Duce RA. 1981. Atmospheric input of phosphorus to remote Tropical Islands. Pac Sci 35(3): 241-255.
Abstract: Atmospheric particulate phosphorus has been measured in the
tradewinds of the Hawaiian and Samoan islands. The concentration of phosphorus
range from 300 to 800 pg m-3 and averages about 500 pg m-3. Reactive phosphorus comprises 20-35 percent of the total phosphorus, persulfate persulfate
releasable phosphorus 20-35 percent, and acid-soluble phosphorus 40-60
percent. The reactive phosphorus appears to be of crustal origin, while the
acid-soluble fraction is of marine origin. The origin of the persulfate releasable
phosphorus is not readily apparent. The acid-soluble fraction may be either
organic or inorganic in nature. The persulfate releasable fraction appears to
be comprised of organic material. The net phosphorus input to the vegetation
on the windward sides of these islands is estimated to be 0.025-0.030 kg ha-1
yr- 1
. The value amounts to percent of the phosphorus deposition
measured at an island site. It appears that bulk precipitation samples are
easily contaminated in regions of intense biological activity.
ISSN: 0030-8870
Appears in Collections:Pacific Science Volume 35, Number 3, 1981

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