外来入侵植物刺槐对土壤微生物群落的影响

H. Wasserstrom, Y. Steinberger
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引用次数: 1

摘要

在过去的十年中,植物入侵已经成为全球自然生态系统面临的最大威胁之一,它们对入侵地区原生植物群和生物群的影响越来越引起人们的兴趣。然而,在沙丘生态系统等恶劣环境中,它们对土壤微生物群落,特别是非真菌群落的影响知之甚少。本研究在以色列沙伦沙丘北部进行,目的是研究外来入侵植物亚腋下异苔草(Heterotheca subaxillaris)对沙丘微生物群落的影响。土壤样本是在一种入侵植物(单精子蒿)的树冠下,以及在两个地点的光秃秃的地区收集的,在湿润和干燥季节,这些地点离海岸的距离不同。MicroRespTM系统方法提供了群落水平的微生物生物量、基础呼吸和群落水平生理剖面(CLPP)数据,以及土壤水分、有机质、电导率和ph等非生物成分的数据。与单精子草(A. monosperma)样品相比,下芽草冠层土壤样品中的微生物群落活性较低,CLPP、微生物生物量和基础呼吸也明显较低。土壤非生物变量受季节、地点的强烈影响,并与植被覆盖及其生态生理适应有关。本研究强调了植物入侵对土壤微生物群落的威胁,特别是在独特和恶劣的沙丘生态系统中。这种威胁也可能影响到生活在这个脆弱环境中的其他生物。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Soil Microbial-Community Alteration in Response to Heterotheca subaxillaris – an Invasive Alien Plant
Plant invasions have become one of the biggest threats to natural ecosystems across the globe during the last decade, and there is growing interest in their effect on the native flora and biota in invaded areas. However, little is known about their effect on soil microbial communities, especially non-fungal communities, in harsh environments such as a sand-dune ecosystem. The objective of this study, conducted in the northern Sharon sand-dune area of Israel, was to investigate the influence of the invasive alien plant Heterotheca subaxillaris on a sand-dune microbial community. Soil samples were collected under the canopies of the invasive plant, a native plant (Artemisia monosperma), and from bare areas at two sites, at different distances from the seashore going inland during the wet and dry seasons. MicroRespTM system methodology provided data on microbial biomass, basal respiration, and the community-level physiological profile (CLPP) at the community level, in addition to abiotic components, e.g., soil moisture, organic matter, conductivity, and pH. The microbial community in the soil samples found under the canopy of H. subaxillaris was less active and exhibited significantly lower CLPP, microbial biomass, and basal respiration than in the A. monosperma (native plant) samples. Soil abiotic variables were strongly affected by seasonality, sites, and were related to plant cover and the ecophysiological adaptation of each one. This study emphasizes the threat to soil microbial communities induced by plant invasion, especially in unique and harsh sand-dune ecosystems. This threat might also affect other organisms living in this fragile environment.
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