Changes in soil diversity and global activities following invasions of the exotic invasive plant, Amaranthus viridis L., decrease the growth of native sahelian Acacia species.
Changes in soil diversity and global activities following invasions of the exotic invasive plant, Amaranthus viridis L., decrease the growth of native sahelian Acacia species.
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DOI：
10.1111/j.1574-6941.2009.00740.x
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发表时间：
2009-10
影响因子：
4.2
通讯作者：
A. Sanon;T. Béguiristain;A. Cébron;J. Berthelin;I. Ndoye;C. Leyval;S. Sylla;R. Duponnois
中科院分区：
文献类型：
--
作者：
A. Sanon;T. Béguiristain;A. Cébron;J. Berthelin;I. Ndoye;C. Leyval;S. Sylla;R. Duponnois
本研究的目的是确定是否入侵植物苋viridis影响土壤微生物和化学性质，并评估这些修改对本地植物生长的后果。实验在塞内加尔的两个地点进行：一个是被A.另一种被其他植物覆盖。测定了土壤养分含量、微生物群落密度、多样性和功能。此外，五种萨赫勒相思树种生长在（1）消毒或未从两个地点收集的土壤中，（2）暴露于A.（3）从入侵地和未入侵地采集的土壤，接种或未接种丛枝菌根真菌Glomus intraradices。结果表明，A.绿植提高了土壤养分有效性、细菌丰度和微生物活性。与此相反，AM真菌和根瘤菌的发展和生长的相思树物种严重减少在A。绿色入侵的土壤绿色苋水提物对根瘤菌生长也表现出抑制作用，表明该植物提取物具有抗菌活性。但接种G.根内扦插对相思属树种的生长和结球极为有利。这些结果突出了AM共生在植物共存过程中的作用，并在生态系统管理计划，目标是保护本地植物多样性。
The objectives of this study were to determine whether the invasive plant Amaranthus viridis influenced soil microbial and chemical properties and to assess the consequences of these modifications on native plant growth. The experiment was conducted in Senegal at two sites: one invaded by A. viridis and the other covered by other plant species. Soil nutrient contents as well as microbial community density, diversity and functions were measured. Additionally, five sahelian Acacia species were grown in (1) soil disinfected or not collected from both sites, (2) uninvaded soil exposed to an A. viridis plant aqueous extract and (3) soil collected from invaded and uninvaded sites and inoculated or not with the arbuscular mycorrhizal (AM) fungus Glomus intraradices. The results showed that the invasion of A. viridis increased soil nutrient availability, bacterial abundance and microbial activities. In contrast, AM fungi and rhizobial development and the growth of Acacia species were severely reduced in A. viridis-invaded soil. Amaranthus viridis aqueous extract also exhibited an inhibitory effect on rhizobial growth, indicating an antibacterial activity of this plant extract. However, the inoculation of G. intraradices was highly beneficial to the growth and nodulation of Acacia species. These results highlight the role of AM symbiosis in the processes involved in plant coexistence and in ecosystem management programs that target preservation of native plant diversity.