Silvopastoral systems in dry Chaco, Argentina: Impact on soil chemical parameters and bacterial communities

Viruel, Emilce; Fontana, Cecilia Alejandra; Bassi, Daniela; Puglisi, Edoardo; Radrizzani, Alejandro; Calsina, L. Martínez; Banegas, Natalia Romina; Cocconcelli, Pier Sandro

doi:10.1111/sum.12653

Cited by 5 publications

(1 citation statement)

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“…The role of microbial communities in arid and semiarid regions of South America has received less attention and thus more research is needed on drylands, which are expected to increase due to global warming (Koutroulis, 2019). Particularly in Argentina, the impact of land‐use change on soil microbial communities of the arid Gran Chaco region has been poorly studied and mainly focused on grazing disturbances (Silberman et al, 2019; Viruel et al, 2021). However, to our knowledge, the soil microbial structure and diversity have never been studied in arid lands under livestock or agriculture disturbance in the central region of Argentina.…”

Section: Introductionmentioning

confidence: 99%

Influence of land‐use changes on microbial community structure and diversity in a semiarid region

et al. 2022

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Land-use change and the conversion of land into croplands is one of the main drivers of soil degradation and the loss of soil organic carbon. Few studies have evaluated the impact of the expansion of the agricultural frontier on soil microbial communities in the Gran Chaco region in South America; therefore, the objective of this study was to explore how soil microbial communities respond to land-use changes in a semiarid region of Argentina. The land uses selected were total and selective clearing with livestock (TC-livestock and SC-livestock), total clearing with agriculture (TC-agriculture), and an undisturbed site (R-Chancaní). Our results suggest that microbial abundances were strongly influenced by seasonal changes. In both seasons, the lowest values of total microbial biomass were observed in TC-agriculture and TC-livestock.In the wet season, TC-agriculture had the lowest fungal abundance, and both total clearing sites (TC-livestock and TC-agriculture) had higher bacterial abundance than the other sites. Our data also showed that the Shannon and richness indices were highest at the farming sites, indicating a similar tendency in the diversity indexes in both dry and wet seasons. According to Pearson correlation analysis, humic substance (HS) content was a key driver influencing soil microbial communities, demonstrating that high HS content may significantly increase bacteria, fungi, and total phospholipid fatty acids. Microbial composition highly depended on seasonal changes. Overall, our results suggest that land-use change altered microbial community structure and bacterial diversity, and that HS content played a crucial role in driving changes in soil microbial composition.

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Section: Introductionmentioning

confidence: 99%