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首页> 外文期刊>Southern forests: a Journal of forest science >Nitrogen fixation of Acacia mangium Willd. from two seed sources grown at different levels of phosphorus in an Ultisol, South Sumatra, Indonesia
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Nitrogen fixation of Acacia mangium Willd. from two seed sources grown at different levels of phosphorus in an Ultisol, South Sumatra, Indonesia

机译：马占相思Willd的固氮作用。来自印度尼西亚南苏门答腊岛Ultisol两种不同磷含量的种子来源

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摘要

Phosphorus (P) is required to facilitate the fixation of atmospheric nitrogen (N) by leguminous species such as Acacia mangium. We studied the N fixation of A. mangium trees grown from two seed sources. These consisted of bulk seedlots collected from seed orchards in Sumatra, one based on natural provenances from the Cairns region, Queensland, Australia, and the other on the Muting natural provenance, Papua, Indonesia. The seedlots were grown under contrasting P supply (application rates of 0 and 100 kg ha(-1)) on acidic clay soils in a field experiment at Lematang, South Sumatra. The N-15 natural abundance method was used, with Eucalyptus pellita as a non-N-fixing reference species. Foliage samples were collected at age 12 and 18 months. Application of P increased stem volume, foliage N concentrations and the amount of N fixed in both seed sources at 12 and 18 months of age. For the Cairns-origin seed source, the percentage of N derived from atmospheric N was low (c. 14%) without P addition, but increased by more than four-fold with P addition. In contrast, N fixed by the Muting-origin seed source (c. 45-60%) was not significantly affected by P addition. The Cairns-origin seed source partly compensated for lower N fixation by taking up a larger amount of soil N. Thus there were significant differences between seed sources in their N-fixing capacity and the effect of P nutrition on this process. The higher productivity of Muting under low P application appeared to be associated with better P utilisation and greater N fixation, but it was still responsive to P application.
机译：需要磷（P）来促进豆荚相思等豆科植物固着大气中的氮（N）。我们研究了从两种种子来源生长的man木的固氮作用。其中包括从苏门答腊种子园收集的散装种子场，一个基于澳大利亚昆士兰州凯恩斯地区自然种源，另一个基于印度尼西亚巴布亚Muting自然种源。在南苏门答腊省Lematang的田间试验中，在相反的磷供应（0和100 kg ha（-1）的施用量）下，在酸性粘土土壤上生长了种田。使用N-15自然丰度方法，将pellella桉作为非N固定参考物种。在12和18个月大时收集叶子样本。施磷增加了12和18个月大时两种种子源中茎的体积，叶片中的氮含量和固定的氮含量。对于凯恩斯起源的种子源，在不添加P的情况下，源自大气N的N的比例很低（约14％），但在添加P的情况下增加了四倍以上。相反，由突变来源的种子固定的氮（约45-60％）不受添加磷的影响。凯恩斯起源的种子源通过吸收大量的土壤氮来部分补偿较低的固氮作用。因此，种子源的固氮能力和磷素营养对此过程的影响之间存在显着差异。低磷施用条件下诱变的较高生产力似乎与更好的磷利用率和更大的固氮能力有关，但仍对磷施用有反应。

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