期刊
EUROPEAN JOURNAL OF SOIL BIOLOGY
卷 86, 期 -, 页码 52-62出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ejsobi.2018.03.003
关键词
Leguminous tree; Nitrogen-fixing symbiosis; N-15 natural abundance; Contrasted edaphic conditions; New Caledonia
资金
- French National Agency for Research (ANR) through the BIOADAPT Program [ANR-12-ADAP-0017]
- Agence Nationale de la Recherche (ANR) [ANR-12-ADAP-0017] Funding Source: Agence Nationale de la Recherche (ANR)
Acacia spirorbis subsp. spirorbis Labill. is a legume tree that grows on calcareous, metalliferous and siliceous soils and is endemic to New Caledonia. The present study assesses the nitrogen-fixing potential of A. spirorbis in its contrasted natural environments. Soil samples, the leaves of A. spirorbis and of co-occurring non-N-2-fixing reference plant species were collected from nine study sites across New Caledonia. Soil properties were analyzed by ICP-AES. Nitrogen (N) content and natural N-15 abundance (delta N-15) were measured in A. spirorbis and in reference plants. The percentage of N derived from the atmosphere (%Ndfa) fixed by A. spirorbis was also assessed and correlated with soil parameters. Remarkably, mean N contents in A. spirorbis showed no significant differences whatever the soil categories (20.2 +/- 3.5 g kg(-1)) whereas major differences were found in N contents in the reference plants. The average delta N-15 value of A. spirorbis was close to zero ( + 0.29 parts per thousand), while that of the reference species ranged from -4.83 to +7.05 parts per thousand. In eight of the nine sites studied, A. spirorbis %Ndfa was above 70%, regardless of the soil category. Unlike in the reference species, no statistical correlations were found between A. spirorbis N content and delta N-15 abundance and soil parameters. Despite the difficulty of using the delta N-15 abundance method in such contrasted environments, the resulting data show that A. spirorbis has the highest N-2-fixing potential yet recorded in the genus Acacia and its nitrogen fixation is effective almost throughout its natural range.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据