期刊
PLANT AND SOIL
卷 341, 期 1-2, 页码 295-307出版社
SPRINGER
DOI: 10.1007/s11104-010-0644-3
关键词
Litter quality; Leguminous tree; Nutrient demand; Resorption; N-to-P ratio
资金
- Ministry of Agriculture, Forestry and Fisheries of Japan
Some tropical N-2-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-2-fixing plantations, litterfall and fresh leaf quality of a N-2-fixing Acacia mangium plantation were compared with that of a non-N-2-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 N-2-fixers than in non-N-2-fixers, and those of A. mangium were high among species in the N-2-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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