Nitrogen and phosphorus retranslocation and N:P ratios of litterfall in three tropical plantations: luxurious N and efficient P use by Acacia mangium |
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Authors: | Masahiro Inagaki Koichi Kamo Kazuki Miyamoto Jupiri Titin Lenim Jamalung Jaffirin Lapongan Satoru Miura |
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Institution: | 1. Department of Forest Site Environment, Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, 305-8687, Ibaraki, Japan 2. Forest Science and Technology Institute, Tsukuba, 305-0047, Ibaraki, Japan 3. Shikoku Research Center, Forestry and Forest Products Research Institute, 780-8077, Kochi, Japan 4. Forest Research Centre, Sandakan, 90715, Sabah, Malaysia
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Abstract: | Some tropical N2-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 N2-fixing plantations, litterfall and fresh leaf quality of a N2-fixing Acacia mangium plantation were compared with that of a non-N2-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–1, 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–1) 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 N2-fixers than in non-N2-fixers, and those of A. mangium were high among species in the N2-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. |
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