NDLI: Effect of soil heterogeneity on gross nitrogen mineralization measured by $^{15}$N-pool dilution techniques

Content Provider	Springer Nature Link
Author	Luxhøi, J. Nielsen, N.E. Jensen, L.S.
Copyright Year	2004
Abstract	Pool dilution techniques, where the soil ammonium pool is labeled with $^{15}$NH$_{4}$ $^{+}$, are commonly used to estimate gross N mineralization rates in soil. To estimate the rates unbiased, it is assumed that the $^{15}$NH$_{4}$ $^{+}$ is distributed homogenously in ambient $^{14}$NH$_{4}$ $^{+}$ pool of the soil. However, completely homogeneous distribution of $^{15}$NH$_{4}$ $^{+}$ may commonly not be feasible. The objective of this paper was to examine the importance of the spatial distribution of $^{14}$NH$_{4}$ $^{+}$ and $^{15}$NH$_{4}$ $^{+}$ on the measured gross N mineralization rate. In a 2-day incubation experiment, gross N mineralization rates were measured in soil, where different distributions of $^{14}$NH$_{4}$ $^{+}$ and $^{15}$NH$_{4}$ $^{+}$ were combined. Generally, distribution of $^{15}$NH$_{4}$ $^{+}$ to 50% of the soil volume did not alter the measured gross mineralization rate however more heterogeneous distribution caused the rate to be underestimated. Certain combinations of $^{14}$NH$_{4}$ $^{+}$ and $^{15}$NH$_{4}$ $^{+}$ distributions caused the rate to be overestimated. Based on the experimental results, we developed a 2-dimensional model array of soil compartments, to estimate the gross N mineralization and gross NH$_{4}$ $^{+}$ consumption rates in local microsites in the soil. If one of the nitrogen-isotopes was more abundant in a compartment with high NH$_{4}$ $^{+}$-concentration, and the other nitrogen-isotope was more abundant in a compartment with low NH$_{4}$ $^{+}$-concentration, the nitrogen-isotopes would have different apparent bioavailability, hence the gross N mineralization rate would be erroneously estimated. On the other hand, in soil where all compartments had low NH$_{4}$ $^{+}$-concentrations, heterogeneous distribution of $^{14}$NH$_{4}$ $^{+}$, $^{15}$NH$_{4}$ $^{+}$ and microbial activity did not influence the measured gross N mineralization rate significantly.
Starting Page	263
Ending Page	275
Page Count	13
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	262
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Plant Sciences Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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