| Main Title |
Watershed and point source enrichment and lake trophic state index / |
| Author |
Neel, Joe Kendall,
|
| CORP Author |
North Dakota Univ., Grand Forks. Dept. of Biology.;Corvallis Environmental Research Lab., OR. |
| Publisher |
Corvallis Environmental Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, |
| Year Published |
1979 |
| Report Number |
EPA-600/3-79-046; EPA-R-800490 |
| Stock Number |
PB-299 197 |
| OCLC Number |
05346564 |
| Subjects |
Watersheds ;
Lakes ;
Water--Pollution
|
| Additional Subjects |
Water pollution ;
Pelican River ;
Primary biological productivity ;
Nutrients ;
Watersheds ;
Phosphorus ;
Concentration(Composition) ;
Algae ;
Vegetation ;
Aquatic plants ;
Surface waters ;
Ground water ;
Seepage ;
Oxygen ;
Hydrogen sulfide ;
Minnesota ;
Eutrophication ;
Trophic level ;
Point sources ;
Water quality data
|
| Internet Access |
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| EHAM |
TD224.M6N44 1979 |
|
Region 1 Library/Boston,MA |
04/29/2016 |
| EJBD |
EPA 600-3-79-046 |
|
Headquarters Library/Washington,DC |
03/22/2016 |
| ELBD ARCHIVE |
EPA 600-3-79-046 |
Received from HQ |
AWBERC Library/Cincinnati,OH |
10/04/2023 |
| ELBD |
EPA 600-3-79-046 |
|
AWBERC Library/Cincinnati,OH |
11/15/2016 |
| ESAD |
EPA 600-3-79-046 |
|
Region 10 Library/Seattle,WA |
03/23/2010 |
| NTIS |
PB-299 197 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
ix, 102 pages : illustrations ; 28 cm |
| Abstract |
Water in the permeable soils of the upper Pelican River watershed, Minnesota, requires slightly more than a year to move generally out of the phreatic zone into surface channels and basins. Its nutrient content seems mainly responsible for the load borne in surface waters above entrance of a wastewater effluent, and groundwater changes have been followed a year later by similar ones in surface water. In 1975 P load from non-point sources markedly exceeded that from the wastewater effluent. Nutrients in groundwater are assumed to result from soil surface application, but only quantities supplied by precipitation have been measured. The most noxious conditions in surface waters have been occasioned by heterocystous blue-green phytoplankters, but the greatest plant mass has been produced by rooted and attached vegetation. Groundwater seepage into these lakes contributed more nutrients than precipitation, but the latter supplied what may be significant amounts to watershed soils. A trophic state index based on change in Mg/Ca quotient relative to water residence time has reliably depicted relative total productivity levels in 6 lakes or ponds, and its general applicability, at least to natural lakes, now appears likely. |
| Notes |
Includes bibliographical references (pages 70-71). |
| Place Published |
Corvallis Springfield, Va. |
| Access Notes |
Also issued online. |
| Corporate Au Added Ent |
Corvallis Environmental Research Laboratory |
| PUB Date Free Form |
1979 |
| Series Title Untraced |
Ecological research series ; EPA-600/3-79-046 |
| NTIS Prices |
PC A06/MF A01 |
| BIB Level |
m |
| Medium |
unmediated |
| Content |
text |
| Carrier |
volume |
| Cataloging Source |
OCLC/T |
| Merged OCLC records |
1225751614 |
| OCLC Time Stamp |
20170831052824 |
| Language |
eng |
| SUDOCS Number |
EP 1.23:600/3-79-046 |
| Origin |
OCLC |
| Type |
MERGE |
| OCLC Rec Leader |
02198cam 2200529Ki 45010 |
