首页|Edaphic factors override temperature in shaping soil bacterial diversity across an elevation-vegetation gradient in Himalaya

Edaphic factors override temperature in shaping soil bacterial diversity across an elevation-vegetation gradient in Himalaya

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  • NSTL
  • Elsevier
ABSTR A C T Assessment of bacterial community distribution patterns along elevation gradients is invaluable in understanding the underlying mechanism involved in their diversity formation, sustenance, and response to environmental changes. However, no consensus has been reached as studies show contrasting patterns with different regulating factors due to habitat specificity and associated environmental conditions. Moreover, limited studies have considered spatial and temporal variability in bacterial diversity simultaneously. Here, we provide three years of meta-barcoding-based insight into the effects of environmental changes on soil bacterial communities and their driving factors across elevation-vegetation gradient (3373-4020 m) in the Himalaya. We also assess their sea-sonal and inter-annual variations. Results indicate that extreme elevations viz., low and high, having similar edaphic factors but different climatic regimes, showed similar bacterial diversity compared to a dip at mid-elevations caused by low moisture and substrate availability. Bacterial alpha-diversity and relative abundances of major phyla showed mid-elevation dip mainly caused by the direct impact of edaphic factors (soil organic carbon, total nitrogen, and moisture) but not temperature. Community composition showed three distinct clusters across elevation gradient and was also influenced directly by edaphic properties in addition to tem-perature. Moreover, we observed no significant seasonal and inter-annual variability in alpha and beta-diversity, sug-gesting stability in bacterial communities over time. The mid-elevations harbored predominantly competitive interactions, while low and high elevations exhibited co-operative interactions. Taken together, the results show the critical role of edaphic properties over the temperature in influencing bacterial diversity and indicate the community resilience towards climate warming. Our study will enhance the predictability of the community dynamics across broader spatio-temporal scales under changing climate.

Soil bacterial communityMetabarcodingElevation-vegetation gradientSeasonal and inter-annual dynamicsAlpine region of HimalayaClimate changeMICROBIAL COMMUNITY STRUCTUREORGANIC-MATTER DECOMPOSITIONALTITUDINAL GRADIENTENZYME-ACTIVITIESCARBONSTORAGEPATTERNS

Bhattacharya, Pamela、Tiwari, Pankaj、Rai, Ishwari Datt、Talukdar, Gautam、Rawat, Gopal Singh

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Wildlife Inst India

2022

10.1016/j.apsoil.2021.104306

Applied Soil Ecology

Applied Soil Ecology

SCI
ISSN：0929-1393
年,卷(期)：2022.170
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