『Abstract
In acid forest soils nitrate (NO3-)
from anthropogenic nitrogen deposition is retained at levels beyond
what can be explained by known biological mechanisms. a number
of researchers have hypothesized that abiotic NO3-
incorporation into soil organic matter might be responsible for
this phenomenon, however studies have been limited to a few temperate
forest sites. The goal of this study was to determine if abiotic
NO3- incorporation is important
across a wide range of soil types. We collected 44 soils from
a number of different ecosystem types in North and South America
and measured the extent of abiotic NO3-
incorporation. Significant abiotic nitrate incorporation did not
occur in any of the soils examined. we show that the apparent
abiotic incorporation observed in previous studies is likely the
result of iron interference with NO3-
measurements. Our results suggest that abiotic NO3-
incorporation is not a likely explanation for the high rates of
NO3- retention observed in some
ecosystems.
Keywords: Abiotic nitrate incorporation; Iron; Nitrogen deposition;
Nitrogen retention』
Introduction
Materials and methods
Soil collection
Soil preparation and sterilization
Abiotic incorporation experiment
Nutrient analyses
Iron interference quantification
Iron concentration in solutions
Results and discussion
Acknowledgements
Appendix A
References