Main Title |
Dynamics of the Nitrogen Cycle in Lakes. |
Author |
Alexande, Vera ;
|
CORP Author |
Alaska Univ., College. Inst. of Marine Science. |
Year Published |
1970 |
Report Number |
R71-7; EPA-WQO-16010-DDS; 00354,; 16010-DDS-03/70 |
Stock Number |
PB-203 791 |
Additional Subjects |
( Nitrogen cycle ;
Water chemistry) ;
( Nitrogen fixation ;
Fresh water biology) ;
( Alaska ;
Limnology) ;
Lakes ;
Algae ;
Nitrogen isotopes ;
Nitrates ;
Ammonia ;
Denitration ;
Metabolism ;
Sampling ;
Labeled substances ;
Seasonal variations ;
Nutrients ;
Water pollution ;
Nitrogen 15 ;
Subarctic regions ;
Eutrification
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB-203 791 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
220p |
Abstract |
The importance of nitrogen fixation by blue-green algal populations was established, and nitrogen-15 was introduced for measuring in situ nitrogen fixation rates in natural waters. Nitrogen-15 techniques were developed for measuring nitrate and ammonia uptake, and the importanc3 of ammonia as a nitrogen source in lakes became apparent. Denitrification rates were measured accurately in anoxic lake waters. Rapid ammonia supply and turnover was demonstrated in lake waters. This implies that substantial nitrogen regeneration takes place constantly in surface waters of these lakes, and that this can provide a major nutrient source for the photosynthetic population. Such ammonia supply is independent of any sediment interaction. The limnological information available for interior Alaska has been expanded through the work. The Dumas method using a Coleman nitrogen analyzer were introduced for preparing nitrogen samples for mass spectrometry. (Author) |
NTIS Title Notes |
Final rept.. |
PUB Date Free Form |
Mar 70, |
Category Codes |
8H; 6A; 64H; 57B |
NTIS Prices |
PC A10 MF A01 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
326522375 |
Origin |
NTIS |
Type |
CAT |