NDLI: Phosphorus Accumulation in Saint Lawrence River Watershed Soils: A Century-Long Perspective

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Phosphorus Accumulation in Saint Lawrence River Watershed Soils: A Century-Long Perspective

Content Provider	Springer Nature Link
Author	MacDonald, Graham K. Bennett, Elena M.
Copyright Year	2009
Abstract	Understanding historical patterns of soil phosphorus (P) accumulation is critical to management of water quality across agricultural landscapes. To address the effects of long-term agricultural P management on soil P accumulation in the Saint Lawrence River sub-basin (574,000 km2), we calculated cropland P budgets at decadal intervals from 1901 to 2001 for the sub-basin and its tributary watersheds. Agricultural census data were used to estimate P inputs in the form of fertilizer and manure, and outputs (P removed in harvested crops). The resulting balances indicate the potential magnitude of P accumulation in cropland soils. Cropland P surpluses occurred in the sub-basin in each decade of the past century, with the rate of accumulation increasing after 1951 due to more widespread use of P fertilizers and manure. The largest annual P surplus occurred in 1981 (42,000 Mg y−1), followed by a decline in the rate of accumulation to almost half that level by 2001 (24,850 Mg y−1) as a result of improved management of agricultural P. Comparison of the cumulative P surpluses estimated for the entire 20th century with measured soil P data indicates a strong linear relationship between these watershed P budgets and the average soil P content across the sub-basin (R 2 = 0.712, P < 0.0001). These results support the view that historical land management can have important ecological legacies.
Starting Page	621
Ending Page	635
Page Count	15
File Format	PDF
ISSN	14329840
Journal	Ecosystems
Volume Number	12
Issue Number	4
e-ISSN	14350629
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-04-30
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	phosphorus land use historical ecology eutrophication nutrient budgets watershed agricultural pollution soil P historical legacy Nature Conservation Geoecology/Natural Processes Environmental Management Zoology Plant Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry Ecology, Evolution, Behavior and Systematics

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