Temporal Variation of N Isotopic Composition of Decomposing Legume Roots and Its Implications to N Cycling Estimates in N15 Tracer Studies in Agroforestry Systems
Joint Authors
Source
Applied and Environmental Soil Science
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-09-26
Country of Publication
Egypt
No. of Pages
14
Main Subjects
Earth Science , Water and Environment
Abstract EN
Below-ground residue of agroforestry trees is an important N source for associated crops.
Several studies have shown that its isotopic signature (δ15N) may change after tree pruning, which makes it difficult to study below-ground N inputs from pruned trees by isotopic techniques.
We studied how temporal variation of legume root residue δ15N could be explained by considering differential decomposition kinetics and 15N content of residue fractions.
A mathematical model on the isotopic patterns of soil and a N recipient plant during root decomposition was developed and applied for testing assumptions about residue characteristics against two experimental datasets.
Observed 15N patterns of the recipient plants could be satisfactorily simulated only when the residue was assumed to consist of at least two fractions with distinct δ15N and decomposition rates depending on their C : N ratio.
Assuming δ15N of residue constant over time resulted in substantial underestimates of N derived from low-quality residue (%Ndfr) by the recipient plant when compared with experimental data.
Results of this study suggest that residue fractionation can help improve estimation of %Ndfr in isotopic studies, as an alternative or complementary method to assuming or aiming at homogenous isotopic composition of N sources.
American Psychological Association (APA)
Jalonen, Riina& Sierra, Jorge. 2012. Temporal Variation of N Isotopic Composition of Decomposing Legume Roots and Its Implications to N Cycling Estimates in N15 Tracer Studies in Agroforestry Systems. Applied and Environmental Soil Science،Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-477043
Modern Language Association (MLA)
Jalonen, Riina& Sierra, Jorge. Temporal Variation of N Isotopic Composition of Decomposing Legume Roots and Its Implications to N Cycling Estimates in N15 Tracer Studies in Agroforestry Systems. Applied and Environmental Soil Science No. 2012 (2012), pp.1-14.
https://search.emarefa.net/detail/BIM-477043
American Medical Association (AMA)
Jalonen, Riina& Sierra, Jorge. Temporal Variation of N Isotopic Composition of Decomposing Legume Roots and Its Implications to N Cycling Estimates in N15 Tracer Studies in Agroforestry Systems. Applied and Environmental Soil Science. 2012. Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-477043
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-477043