| Main Title |
Root-Exuded Oxygen in the Aquatic Angiosperm 'Ruppia maritima'. |
| Author |
Thursby, G. B. ;
|
| CORP Author |
Environmental Research Lab., Narragansett, RI. ;Rhode Island Univ., Kingston. Dept. of Botany. |
| Year Published |
1984 |
| Report Number |
EPA-600/J-84-048; |
| Stock Number |
PB84-222652 |
| Additional Subjects |
Oxygenation ;
Sea grasses ;
Inorganic nitrates ;
Sediments ;
Oxygen ;
Removal ;
Nitrification ;
Diffusion ;
Concentration(Composition) ;
Nitrites ;
Ammonia ;
Plant physiology ;
Reprints ;
Foreign technology ;
Ruppia maritima ;
Vascular plants ;
Roots
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB84-222652 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
4p |
| Abstract |
The potential impact of oxygen from roots on the source of inorganic nitrogen for Ruppia maritima L. (Potamogetonales) was investigated in laboratory experiments. Roots released oxygen at an average rate of 2 to 3 micrograms O2 (mg dry wt)/hr. A distinctive oxygenated zone with a radius of 0.75 to 1.25 mm developed in the sediment around the roots. Although nitrate and nitrite could have been present in the oxygenated zone, these were unlikely to be significant sources of nitrogen for R. maritima. Root hairs extended up to 6 mm beyond this zone. In addition, roots of plants cultured in a flow-through system took up ammonia at a rate approximately 9 times greater than that for either nitrate or nitrite. |
| Supplementary Notes |
Prepared in cooperation with Rhode Island Univ., Kingston. Dept. of Botany. |
| Availability Notes |
Pub. in Marine Ecology Progress Series, v16 p303-305 1984. |
| NTIS Title Notes |
Journal article. |
| Title Annotations |
Reprint: Root-Exuded Oxygen in the Aquatic Angiosperm 'Ruppia maritima'. |
| PUB Date Free Form |
c1984 |
| Category Codes |
8A; 6A; 47D; 57B |
| NTIS Prices |
Not available NTIS |
| Primary Description |
600/05 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
428625124 |
| Origin |
NTIS |
| Type |
CAT |
