Anthropogenic phosphorus inputs to a river basin and their impacts on riverine phosphorus fluxes along its upstream-downstream continuum
MetadataShow full item record
Zhang, W.S.; Swaney, D. P.; Hong, B.; Howarth, R. W.
The increasing trend in riverine phosphorus (P) loads resulting from anthropogenic inputs has gained wide attention because of the well-known role of P in eutrophication. So far, however, there is still limited scientific understanding of anthropogenic P inputs and their impacts on riverine flux in river reaches along the upstream-to-downstream continuum. Here we investigated P budgets in a series of nested watersheds draining into Hongze Lake of China and developed an empirical function to describe the relationship between anthropogenic inputs and riverine P fluxes. Our results indicated that there are obvious gradients regarding P budgets in response to changes in human activities. Fertilizer application and food and feed P import was always the dominant source of P inputs in all sections, followed by nonfood P. Further interpretation using the model revealed the processes of P loading to the lake. About 2%–9% of anthropogenic P inputs are transported from the various sections into the corresponding tributaries of the river systems, depending upon local precipitation rates. Of this amount, around 41%–95% is delivered to the main stem of the Huai River after in-stream attenuation in its tributaries. Ultimately, 55%–86% of the P loads delivered to different locations of the main stem are transported into the receiving lake of the downstream, due to additional losses in the main stem. An integrated P management strategy that considers the gradients of P loss along the upstream-to-downstream continuum is required to assess and optimize P management to protect the region's freshwater resource.
This study was financially supported by Talents-Import Program in Nanjing Institute of Geography and Limnology (NIGLAS2016QD04), National Natural Science Foundation of China (41701040), and Natural Science Foundation of Jiangsu Province of China (BK20171100).
eutrophication; hongze lake; in-stream retention; net anthropogenic phosphorus input (NAPI); phosphorus; phosphorus budget
Previously Published As
Journal of Geophysical Research: Biogeosciences, 122, 3273–3287
Showing items related by title, author, creator and subject.
Makarewicz, Joseph C.; Lewis, Theodore W.; White, Daniel (Seneca County Soil and Water Conservation District, 2007-08)Monitoring the water quality of Cayuga Lake has continued periodically from the early 1900s to the present. The Seneca County Soil and Water Conservation District (SCSWCD) has collected limnological data on the waters ...
Cayuga Lake (New York) Water Quality Monitoring Data Related to the Cornell Lake Source Cooling Facility, 1998-2009 Adams, James (2010-07-12)Cornell University has been monitoring ambient conditions in Cayuga Lake since 1998 to provide a record of water quality conditions in the lake before and after the Lake Source Cooling facility startup in 2000. The primary ...
Bouldin, David (2007-11-12)In the period 1987 to 1989 a stream water sampling and analysis program for the southern Cayuga Lake basin was carried out as a part of the continuing analysis of central NY water quality (Manuscripts and Water Quality ...