Main Title |
15N Natural Abundance and (15)N Labelling Studies in Forest Ecosystems. |
Author |
Nadelhoffer, K. J. ;
Fry, B. ;
|
CORP Author |
Marine Biological Lab., Woods Hole, MA. Ecosystems Center.;Corvallis Environmental Research Lab., OR. |
Publisher |
1994 |
Year Published |
1994 |
Report Number |
EPA/600/A-94/160; |
Stock Number |
PB94-210580 |
Additional Subjects |
Nitrogen isotopes ;
Forests ;
Ecosystems ;
Variations ;
Soils ;
Vegetation ;
Plant tissues ;
Distillation ;
Biochemical cycles ;
Nitrification ;
Isotopic labeling ;
Sampling ;
Mathematical models ;
Ammonium compounds ;
Concentration(Composition) ;
Natural abundances ;
Patterns
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB94-210580 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
55p |
Abstract |
The relative amounts of the two stable isotopes of Nitrogen (N), 15N and 14N, vary predictably in soils and plant tissues of forests and other non-cultivated ecosystems. Slight fractionations, or discriminations against the heavier N isotope, that can occur as N cycles through vegetation, soils and microbial biomass act over the long term to deplete vegetation and litter of 15N and to enrich humus in 15N. In this chapter, the authors show that 15N natural abundances can be used to make inferences about (1) rates and patterns of N cycling, (2) the relative importance of N inputs versus soil processes in supplying N for plant uptake, (3) retention of N by forests and (4) forest ecosystem health. The authors also discuss uses of 15N-labelling ecosystem-scale experiments on whole forests. Such experiments offer possibilities for checking and improving estimates of N fluxes within and N losses from forests. |
Supplementary Notes |
Pub. in Stable Isotopes in Ecology, 1993. Sponsored by Corvallis Environmental Research Lab., OR. |
NTIS Title Notes |
Book chapter. |
Category Codes |
48D; 48E; 57H; 57B |
NTIS Prices |
PC A04/MF A01 |
Primary Description |
600/02 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
428724632 |
Origin |
NTIS |
Type |
CAT |