Soil microbial communities in (sub)alpine grasslands indicate a moderate shift towards new environmental conditions 11 years after soil translocation
Soil microbial communities in (sub)alpine grasslands indicate a moderate shift towards new environmental conditions 11 years after soil translocation
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DOI：
10.1016/j.soilbio.2011.02.001
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发表时间：
2011-06-01
影响因子：
9.7
通讯作者：
Fuhrer, Juerg
中科院分区：
文献类型：
--
作者：
Budge, Karen;Leifeld, Jens;Fuhrer, Juerg
环境条件的变化可能会导致高山草原土壤微生物群落的改变，但变化的程度和方向很大程度上未知。我们研究的目的是调查（i）瑞士阿尔卑斯山（亚）高山草原土壤海拔梯度上土壤微生物群落的差异，以及（ii）土壤核心从较高海拔地点易位到较低海拔地点的长期影响。将未受干扰的土壤核心从高山地点（海拔 2525 米）迁移到林线附近的亚高山地点（海拔 1895 米），导致有效的人工升温 3.3 摄氏度。我们假设，十多年后，转移核心中的土壤微生物群落将与原始地点的土壤微生物群落不同，但与新地点的群落相似。土壤磷脂脂肪酸（PLFA）分析的结果证实了不同地点之间微生物群落的显着差异，以及微生物总生物量（TMB）的变化以及易位核心中结构群向低海拔群落的比例分布。还观察到与易位相关的模式，即外生菌根和丛枝真菌的生物量分数以及几个结构组的相对含量的变化。因此，土壤微生物群落活动和多样性表明 11 年后向新的场地条件发生了适度的转变，因此，我们的数据表明微生物群落对高山土壤环境变化的反应缓慢。 (C) 2011 Elsevier Ltd. 保留所有权利。
A change in environmental conditions may result in altered soil microbial communities in alpine grasslands but the extent and direction of the change is largely unknown. The aim of our study was to investigate (i) differences in soil microbial communities across an elevation gradient of (sub)alpine grassland soils in the Swiss Alps, and (ii) the long-term effect of translocation of soil cores from a higher to a lower elevation site. The translocation of undisturbed soil cores from a high alpine site (2525 m asl) to a subalpine site near the timberline (1895 m asl) induced an effective artificial warming of 3.3 degrees C. We hypothesized that after longer than a decade, soil microbial community in translocated cores would differ from that at the original site but resemble the community at the new site. Results from soil phospholipid fatty acid (PLFA) analysis confirm significant differences in microbial communities between sites and a shift in total microbial biomass (TMB) and proportional distribution of structural groups in the translocated cores towards the lower elevation community. Patterns related to translocation were also observed as shifts in the fractional biomass of ectomycorrhizal and arbuscular fungi, and in relative contents of several structural groups. Hence, soil microbial community activity and diversity indicate a moderate shift towards new site conditions after 11 years and therefore, our data suggest slow responses of microbial communities to environmental changes in alpine soils. (C) 2011 Elsevier Ltd. All rights reserved.