Natural abundance of 15N in tropical plants with emphasis on tree legumes
Natural abundance of 15N in tropical plants with emphasis on tree legumes
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热带植物（尤其是豆科植物）中 15N 的自然丰度
DOI：
10.1007/bf00013003
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发表时间：
1993
期刊：
影响因子：
4.9
通讯作者：
N. Boonkerd
中科院分区：
文献类型：
--
作者：
T. Yoneyama;Takashi Muraoka;T. Murakami;N. Boonkerd
分析了巴西和泰国热带植物叶片中15 N（δ 15 N）的天然丰度。巴西非固氮树种的δ 15 N值为+4.5 <$1.9 ‰，低于土壤氮的δ 15 N值（+8.0 <$2.2 ‰）。相比之下，含羞草和水曲柳的δ 15 N值非常低（-1.4 ‰ +0.5‰）。除银合欢外，大黍和豆科树种的δ 15 N值与非固氮树种的δ 15 N值相近，说明固定态N在这些植物中的贡献可以忽略不计。泰国非固氮树种的δ 15 N值为+4.9 2. 0 ‰。银合欢、田菁、木麻黄属。和苏铁属（Cycas spp.）δ 15 N值较低，接近大气N2值（0‰），表明这些植物主要是固氮的。决明子属和罗望子的δ 15 N值较高，说明这些植物是非豆科植物。相思属植物δ 15 N值与其生长发育期的δ 15 N值呈负相关。和Gliricidia sepium等可能固氮的豆科树种的平均固氮量略低于非固氮树种，说明这些豆科树种的固氮贡献很小。
Natural abundance of 15N (δ 15N) of leaves harvested from tropical plants in Brazil and Thailand was analyzed. The δ 15N values of non-N2-fixing trees in Brazil were +4.5±1.9‰, which is lower than those of soil nitrogen (+8.0±2.2‰). In contrast, mimosa and kudzu had very low δ 15N values (−1.4≈+0.5‰). The δ 15N values of Panicum maximum and leguminous trees, except Leucaena leucocephala, were similar to those of non-N2-fixing trees, suggesting that the contribution of fixed N in these plants is negligible. The δ 15N values of non-N2-fixing trees in Thailand were +4.9±2.0‰. Leucaena leucocephala, Sesbania grandiflora, Casuarina spp. and Cycas spp. had low δ 15N values, close to the value of atmospheric N2 (0‰), pointing to a major contribution of N2 fixation in these plants. Cassia spp. and Tamarindus indica had high δ 15N values, which confirms that these species are non-nodulating legumes. The δ 15N values of Acacia spp. and Gliricidia sepium and other potentially nodulating tree legumes were, on average, slightly lower than those of non-N2-fixing trees, indicating a small contribution of N2 fixation in these legumes.