Journal
PLANT AND SOIL
Volume 450, Issue 1-2, Pages 183-200Publisher
SPRINGER
DOI: 10.1007/s11104-020-04479-3
Keywords
Bacteria; Closed forest; Fungi; Gaps; ITS; Phylogenetic clustering; Root traits; Soil properties; 16S
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Funding
- Marie Curie IEF fellowship (FP7 European program) [626666/2013]
- French government (ECOPICS project) [ANR-16-CE03-0009, CONACYT-273659]
- Mexican government (ECOPICS project) [ANR-16-CE03-0009, CONACYT-273659]
- Agence Nationale de la Recherche (ANR) [ANR-16-CE03-0009] Funding Source: Agence Nationale de la Recherche (ANR)
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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.
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