The use of 15 N natural abundance variation to examine plant and soil organic fractions in pasture under different management practises

1999 ◽  
Vol 29 (2) ◽  
pp. 135-140 ◽  
Author(s):  
S. J. Kerley ◽  
Stephen C. Jarvis
Keyword(s):  
Natural Abundance ◽  
Organic Fractions ◽  
Abundance Variation ◽  
N Natural Abundance

C and N availability affects the 15 N natural abundance of the soil microbial biomass across a cattle manure gradient

2006 ◽  
Vol 57 (4) ◽  
pp. 468-475 ◽  
Author(s):  
P. Dijkstra ◽  
O. V. Menyailo ◽  
R. R. Doucett ◽  
S. C. Hart ◽  
E. Schwartz ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Soil Microbial Biomass ◽  
Natural Abundance ◽  
Cattle Manure ◽  
N Availability ◽  
Soil Microbial ◽  
C And N ◽  
N Natural Abundance

δ15 N natural abundance in permafrost soil indicates impact of fire on nitrogen cycle

2011 ◽  
Vol 25 (5) ◽  
pp. 661-664 ◽  
Author(s):  
Franz Conen ◽  
Mikhail V. Yakutin ◽  
Alexander N. Puchnin ◽  
Jens Leifeld ◽  
Christine Alewell
Keyword(s):  
Nitrogen Cycle ◽  
Natural Abundance ◽  
Permafrost Soil ◽  
N Natural Abundance

Precision of DLW energy expenditure measurements: contribution of natural abundance variations

1996 ◽  
Vol 270 (1) ◽  
pp. E164-E169 ◽  
Author(s):  
P. Ritz ◽  
T. J. Cole ◽  
C. Couet ◽  
W. A. Coward
Keyword(s):  
Linear Regression ◽  
Energy Expenditure ◽  
Coefficient Of Variation ◽  
Natural Abundance ◽  
Co2 Production ◽  
Doubly Labeled Water ◽  
Product Model ◽  
Group Of Seven ◽  
Accuracy And Precision ◽  
Abundance Variation

Accuracy and precision of the the doubly labeled water (DLW) measurements of energy expenditure are commonly estimated with models that do not account for 2H and 18O natural abundance variation. A new and simple treatment that completes the ratio-product model is derived in the present study. It uses both linear regression of multipoint data with time and information on within-subject 2H and 18O natural abundance variation. Use of this treatment is demonstrated in a group of seven subjects in whom 2H and 18O natural abundance variation was assessed by collecting predose samples for 6-8 days before dosing. In this set of 16 measurements, the precision (coefficient of variation) of individual DLW estimates of CO2 production was 4.90 +/- 2.14%, of which 3.23 +/- 1.20% arose from natural abundance variation.

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