Signatur:
S 90.0002(1754)
In:
Professional paper
Beschreibung / Inhaltsverzeichnis:
Excessive nutrient [phosphorus (P) and nitrogen (N)] input from point and nonpoint sources is frequently associated with degraded water quality in streams and rivers. Point-source discharges of nutrients are fairly constant and are controlled by the U.S. Environmental Protection Agency's (USEPA) National Pollutant Discharge Elimination System. To reduce inputs from nonpoint sources, agricultural performance standards and regulations for croplands and livestock operations are being proposed by various States. In addition, the USEPA is establishing regionally based nutrient criteria that can be refined by each State to determine whether actions are needed to improve water quality. More confidence in the environmental benefits of the proposed performance standards and nutrient criteria would be possible with improved understanding of the biotic responses to a range of nutrient concentrations in different environmental settings.
Materialart:
Schriftenreihen ausleihbar
Seiten:
XII, 81 S.
,
graph. Darst., Ill., Kt.
,
28 cm
ISBN:
9781411321717
Serie:
U.S. Geological Survey professional paper 1754
URL:
http://pubs.usgs.gov/pp/1754/
Standort:
Kompaktmagazin unten
Zweigbibliothek:
GFZ Bibliothek
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