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- Title
Nitrogen and phosphorus retranslocation and N:P ratios of litterfall in three tropical plantations: luxurious N and efficient P use by Acacia mangium.
- Authors
Inagaki, Masahiro; Kamo, Koichi; Miyamoto, Kazuki; Titin, Jupiri; Jamalung, Lenim; Lapongan, Jaffirin; Miura, Satoru
- Abstract
Some tropical N-fixing trees exhibit specific characteristics for phosphorus (P) acquisition and utilisation that contrast with the large nitrogen (N) fluxes in their litterfall. To investigate differences in N and P cycling in N-fixing plantations, litterfall and fresh leaf quality of a N-fixing Acacia mangium plantation were compared with that of a non-N-fixing Swietenia macrophylla plantation and a coniferous Araucaria cunninghamii plantation. The N concentration in the A. mangium litterfall was higher than that in the litterfall of the two other species, whereas the P concentration in the A. mangium leaf litterfall was 0.16 mg g, which was only 12-22% of that of the other species. The P concentration in the reproductive parts of A. mangium was markedly higher (16.1 mg g) than those in the other fractions. The N:P ratio was higher in the leaf fall (81) compared to the fresh leaves (29) of A. mangium, in contrast to the N:P ratios in the leaf samples of the other two species. An analysis of a global litterfall dataset of tropical plantations indicated that N:P ratios in litterfall were significantly higher in N-fixers than in non-N-fixers, and those of A. mangium were high among species in the N-fixer group. These results indicated that A. mangium efficiently retranslocated P in contrast to very large N cycling, under field conditions. These differences may be related to other physiological characteristics of A. mangium.
- Subjects
PLANT translocation; NITROGEN-fixing trees; MANGIUM; TROPICAL plants; HONDURAS mahogany
- Publication
Plant & Soil, 2011, Vol 341, Issue 1/2, p295
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-010-0644-3