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Rhizosphere bacteria are more strongly related to plant root traits than fungi in temperate montane forests: insights from closed and open forest patches along an elevational gradient
Plant and Soil ( IF 4.9 ) Pub Date : 2020-03-31 , DOI: 10.1007/s11104-020-04479-3
Luis Merino-Martín , Robert I. Griffiths , Hyun S. Gweon , Clément Furget-Bretagnon , Anna Oliver , Zhun Mao , Yves Le Bissonnais , Alexia Stokes

Aims Heterogeneous canopies in temperate montane forests affect microclimate and soil characteristics, with important effects on soil microbial communities and related processes. Here, we studied the interactions between plant root traits and soil bacterial and fungal communities in closed forest and open gaps in a mixed forest along an elevational gradient in the French Alps (1400, 1700 and 2000 m). Methods Samples were separated into three fractions (plant root, rhizosphere and bulk soil), to further investigate the influence of plant zones on microbial communities. Bacterial (16S) and fungal (ITS) biodiversity was determined using high throughput sequencing, along with standard measures of soil, litter and root traits. Results We found that (i) microbial community diversity was higher in gaps than in closed forest because of increased root trait diversity and density; (ii) open versus closed forest patches affected phylogenetic dispersion despite differences in elevations with phylogenetic clustering in closed forest; (iii) the interaction between root traits and microbial communities was stronger for rhizosphere and root fractions than for bulk soil and (iv) bacterial community composition was better explained by root traits than for fungi. Conclusions Our findings highlight the importance of open gaps versus closed forest patches and associated root traits affecting microbial community structure, particularly for bacterial assemblages that exhibited a stronger interaction with root traits than for fungi.

中文翻译:

与温带山地森林中的真菌相比,根际细菌与植物根系性状的相关性更强:沿海拔梯度的封闭和开放森林斑块的见解

温带山地森林中的异质树冠影响小气候和土壤特征,对土壤微生物群落和相关过程具有重要影响。在这里,我们研究了法国阿尔卑斯山沿海拔梯度(1400、1700 和 2000 m)的封闭森林和混交林中的开放间隙中植物根系特征与土壤细菌和真菌群落之间的相互作用。方法将样品分为三个部分(植物根、根际和大块土壤),以进一步研究植物区对微生物群落的影响。细菌 (16S) 和真菌 (ITS) 生物多样性通过高通量测序以及土壤、凋落物和根系特征的标准测量来确定。结果我们发现 (i) 由于根性状多样性和密度增加,间隙中的微生物群落多样性高于封闭林中;(ii) 开放与封闭森林斑块影响系统发育分散,尽管封闭森林中系统发育聚类的海拔差异;(iii) 根际和根系部分的根系特征和微生物群落之间的相互作用比大块土壤更强,并且 (iv) 根系特征比真菌更好地解释了细菌群落组成。结论我们的研究结果强调了开放间隙与封闭森林斑块的重要性以及影响微生物群落结构的相关根特征,特别是对于与根特征的相互作用比真菌更强的细菌组合。(ii) 开放与封闭森林斑块影响系统发育分散,尽管封闭森林中系统发育聚类的海拔差异;(iii) 根际和根系部分的根系特征和微生物群落之间的相互作用比大块土壤更强,并且 (iv) 根系特征比真菌更好地解释了细菌群落组成。结论我们的研究结果强调了开放间隙与封闭森林斑块的重要性以及影响微生物群落结构的相关根特征,特别是对于与根特征的相互作用比真菌更强的细菌组合。(ii) 开放与封闭森林斑块影响系统发育分散,尽管封闭森林中系统发育聚类的海拔差异;(iii) 根际和根系部分的根系特征和微生物群落之间的相互作用比大块土壤更强,并且 (iv) 根系特征比真菌更好地解释了细菌群落组成。结论我们的研究结果强调了开放间隙与封闭森林斑块的重要性以及影响微生物群落结构的相关根特征,特别是对于与根特征的相互作用比真菌更强的细菌组合。(iii) 根际和根系部分的根系特征和微生物群落之间的相互作用比大块土壤更强,并且 (iv) 根系特征比真菌更好地解释了细菌群落组成。结论我们的研究结果强调了开放间隙与封闭森林斑块的重要性以及影响微生物群落结构的相关根特征,特别是对于与根特征的相互作用比真菌更强的细菌组合。(iii) 根际和根系部分的根系特征和微生物群落之间的相互作用比大块土壤更强,并且 (iv) 根系特征比真菌更好地解释了细菌群落组成。结论我们的研究结果强调了开放间隙与封闭森林斑块的重要性以及影响微生物群落结构的相关根特征,特别是对于与根特征的相互作用比真菌更强的细菌组合。
更新日期:2020-03-31
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