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Natural 15N abundance in shrub and tree legumes, Casuarina, and non N2 fixing plants in Thailand

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Abstract

The leaves and nodules from the shrub and tree legumes, particularly, Aeschynomene spp., Sesbania spp., Mimosa spp. and Leucaena spp., and Casuarina spp. and the leaves from neighbouring non-fixing plants were analyzed for their natural abundances of 15N (δ 15N).

The δ 15N in the leaves of non-fixing plants was +5.9% on average, whereas those from shrub legumes and Casuarina spp. were lower and close to the values of atmospheric N2, suggesting the large contribution of N2 fixation as the N source in these plants. The δ 15N values of the leaves from tree legumes except for Leucaena spp. were between the shrub legumes and non-fixing plants, which suggests that the fractional contribution of fixed N2 in tree legumes may be smaller than that in the shrub legumes. Casuarina spp. was highly dependent on N2 fixation. The δ 15N values of the nodules from most of the shrub legumes investigated were higher than those of the leaves.

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Authors and Affiliations

  1. Department of Soils and Fertilizers, National Agriculture Research Center, Kannondai 3-1-1, 305, Tsukuba, Ibaraki, Japan

    T. Yoneyama, S. Siripin & K. Kouno

  2. Soil Science Division, Department of Agriculture, Bangkhen, 10900, Bangkok, Thailand

    T. Murakami, N. Boonkerd & P. Wadisirisuk

Authors
  1. T. Yoneyama
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  2. T. Murakami
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  3. N. Boonkerd
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  4. P. Wadisirisuk
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  5. S. Siripin
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  6. K. Kouno
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Yoneyama, T., Murakami, T., Boonkerd, N. et al. Natural 15N abundance in shrub and tree legumes, Casuarina, and non N2 fixing plants in Thailand. Plant Soil 128, 287–292 (1990). https://doi.org/10.1007/BF00011121

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  • DOI: https://doi.org/10.1007/BF00011121

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