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Phosphorus transport by the largest Amazon tributary (Madeira River, Brazil) and its sensitivity to precipitation and damming
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Limnologi.ORCID-id: 0000-0003-3509-8266
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Limnologi.ORCID-id: 0000-0003-1351-9277
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2015 (engelsk)Inngår i: INLAND WATERS, ISSN 2044-2041, E-ISSN 2044-205X, Vol. 5, nr 3, s. 275-282Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Originating in the Bolivian and Peruvian Andes, the Madeira River is the largest tributary of the Amazon River in terms of discharge. Andean rivers transport large quantities of nutrient-rich suspended sediments and are the main source of phosphorus (P) to the Amazon basin. Here, we show the seasonal variability in concentrations and loads of different P forms (total, particulate, dissolved, and soluble reactive P) in the Madeira River through 8 field campaigns between 2009 and 2011. At our sampling reach in Porto Velho, Brazil, the Madeira River transports similar to 177-247 Gg yr(-1) of P, mostly linked to particles (similar to 85%). Concentrations and loads of all P forms have a maximum at rising waters and a minimum at low waters. Total P concentrations were substantially higher at a given discharge at rising water than at a similar discharge at falling water. The peak of P concentrations matched the peak of rainfall in the upper basin, suggesting an influence of precipitation-driven erosion. Projected precipitation increase in the eastern slopes of the Andes could enhance sediment yield and hence the P transport in the Madeira River. Because most of the P is particulate, however, we hypothesize that the planned proliferation of hydropower dams in the Madeira basin has the potential to reduce P loads substantially, possibly counteracting any precipitation-related increases. In the long term, this could be detrimental to highly productive downstream floodplain forests that are seasonally fertilized with P-rich deposits.

sted, utgiver, år, opplag, sider
2015. Vol. 5, nr 3, s. 275-282
Emneord [en]
Amazon, Andes, floodplain, hydropower dams, Madeira River, phosphorus, precipitation
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Identifikatorer
URN: urn:nbn:se:uu:diva-261334DOI: 10.5268/IW-5.3.815ISI: 000358848300008OAI: oai:DiVA.org:uu-261334DiVA, id: diva2:850340
Tilgjengelig fra: 2015-09-01 Laget: 2015-09-01 Sist oppdatert: 2018-05-21bibliografisk kontrollert

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