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Bacterial communities in soil become sensitive to drought under intensive grazing

Jurburg, S. D., Natal-da-Luz, T., Raimundo, J., Morais, P. V., Sousa, J. P., van Elsas, J. D. & Salles, J. F., 15-Mar-2018, In : Science of the Total Environment. 618, p. 1638-1646 9 p.

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  • Bacterial communities in soil become sensitive to drought

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DOI

Increasing climatic and anthropogenic pressures on soil ecosystems are expected to create a global patchwork of disturbance scenarios. Some regions will be strongly impacted by climate change, others by agricultural intensification, and others by both. Soil microbial communities are integral components of terrestrial ecosystems, but their responses to multiple perturbations are poorly understood. Here, we exposed soils from sustainably- or intensively-managed grasslands in an agro-silvo-pastoral oak woodland to month-long intensified drought and flood simulation treatments in a controlled mesocosm setting. We monitored the response of the bacterial communities at the end of one month as well as during the following month of recovery. The communities in sustainably-managed plots under all precipitation regimes were richer and more diverse than those in intensively-managed plots, and contained a lower proportion of rapidly-growing taxa. Soils from both land managements exhibited changes in bacterial community composition in response to flooding, but only intensively-managed soils were affected by drought. The ecologies of bacteria favored by both drought and flood point to both opportunism and stress tolerance as key traits shaping the community following disturbance. Finally, the response of several taxa (i.e. Chloracidobacteria RB41, Janthinobacterium sp.) to precipitation depended on land management, suggesting that the community itself affected individual disturbance responses. Our findings provide an in-depth view of the complexity of soil bacterial community responses to climatic and anthropogenic pressures in time, and highlight the potential of these stressors to have multiplicative effects on the soil biota.

Original languageEnglish
Pages (from-to)1638-1646
Number of pages9
JournalScience of the Total Environment
Volume618
Early online date18-Oct-2017
Publication statusPublished - 15-Mar-2018

    Keywords

  • Journal Article, PRODUCTIVITY, CLIMATE, MICROBIAL COMMUNITIES, LAND-USE, FUNCTIONAL RESILIENCE, ECOSYSTEM, BIODIVERSITY, DIVERSITY, RESPONSES, STRESS

ID: 49505167