Grassland community structure in Permanent Preservation Areas associated with forestry and livestock in the Pampa biome, Southern Brazil

Caumo, Monique; Freitas, Elisete Maria de; Silva, Vinícius Leão da; Toldi, Maicon; Alves, Luciano da Silva; Orlandi, Carla Roberta; Fior, Claudimar Sidnei

doi:10.1016/j.sajb.2021.03.001

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…Basal soil respiration is considered the main measure to evaluate microbial activity and consists of the total sum of all metabolic functions, of which CO2 is produced. Caumo et al (2021), in their study with plant communities, found that the areas with pastures presented higher species richness and that the presence of dry material in the soil is higher in non-pastured areas. The presence of herbivores is relevant in the recycling of vegetative material, changing the dynamics of nutrient cycling by accelerating the process.…”

Section: Resultsmentioning

confidence: 96%

Influence of different soil uses in the Pampa biome, southern Brazil, on fungal communities

Stroher,

Müller,

Heidrich

et al. 2023

Rev. Bras. Ciênc. Ambient.

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Anthropogenic activities in any natural ecosystem cause changes that affect the physical and biological environment, causing degradation. Likewise, these activities can cause significant changes in the chemical and physical factors of the soil, also impacting the microbiological community. The study aimed to evaluate the influence of soil biochemical and physicochemical characteristics on the development of fungal communities in three different soils of the Pampa biome. The soil types selected were: native forest, Eucalyptus plantation and pasture area, in two distinct periods: hot and cold. Microbiological, physicochemical and biochemical analyses of the soils were carried out. The following genera and species of fungi were identified:Aspergillus sp., Aspergillus niger, Fusarium sp., Geotrichum sp., Isaria sp., Penicillium sp., Scedosporium sp., Trichoderma sp., Verticilliumsp. The results showed that the fungal community is being affected by soil composition characteristics, regardless of the sampled areas. Aspergillus sp. is associated with higher amounts of manganese, boron and the Ca+Mg/K ratio in the soil, while A. niger and Trichodermasp. have a negative relationship with these variables. Aspergillus sp. showed a high ability to tolerate Mn. The most diverse area was pasture in the warm period, and the least diverse was Eucalyptus plantation in the cold period. The analyzed taxa had a reduction in the cold period compared to the warm one, except for Aspergillussp. in the Eucalyptus area, which presented a greater amount in the cold period compared to the hot period. It can be seen that the use of soil in the Pampa biome for planting monocultures or for generating pastures interferes with its characteristics and distinctly affects the fungal community.

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Section: Resultsmentioning

confidence: 96%

Influence of different soil uses in the Pampa biome, southern Brazil, on fungal communities

Stroher,

Müller,

Heidrich

et al. 2023

Rev. Bras. Ciênc. Ambient.

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“…To further quantify the difference in bacteria community structure, nonparametric statistics based on the Bray–Curtis dissimilarity index were performed using the rhizosphere bacteria OTU. An principal coordinate analysis (PCoA) and an analysis of similarities (Anosim) were conducted to test if there was indeed a significant difference in rhizosphere bacteria community structure among different growth stages of sugarcane [ 78 ]. At the same time, to visually interpret community dissimilarity and investigate the relationship between bacteria community data and physicochemical data, redundancy analysis (RDA) was selected, and the significance of total physicochemical factors was tested with Monte Carlo permutations (permu = 999) [ 79 ].…”

Section: Methodsmentioning

confidence: 99%

Sugarcane Rhizosphere Bacteria Community Migration Correlates with Growth Stages and Soil Nutrient

Yuan

Liu

Pang

et al. 2022

IJMS

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Plants and rhizosphere bacterial microbiota have intimate relationships. As neighbors of the plant root system, rhizosphere microorganisms have a crucial impact on plant growth and health. In this study, we sampled rhizosphere soil of sugarcane in May (seedling), July (tillering), September (elongation) and November (maturity), respectively. We employ 16S rRNA amplicon sequencing to investigate seasonal variations in rhizosphere bacteria community structure and abundance, as well as their association with soil edaphic factors. The results demonstrate that soil pH, total nitrogen (TN) and available nitrogen (AN) decrease substantially with time. Rhizosphere bacteria diversity (Shannon) and the total enriched OTUs are also significantly higher in July relative to other months. Bacteria OTUs and functional composition exhibit a strong and significant correlation with soil temperature (Tem), suggesting that Tem was the potential determinant controlling rhizosphere bacteria diversity, enriched OTUs as well as functional composition. Redundancy analysis (RDA) point toward soil total potassium (TK), pH, TN, Tem and AN as principal determinant altering shifting bacteria community structure. Variation partitioning analysis (VPA) analysis further validate that a substantial proportion of variation (70.79%) detected in the rhizosphere bacteria community structure was attributed to edaphic factors. Mfuzz analysis classified the bacterial genera into four distinct clusters, with cluster two exhibiting a distinct and dramatic increase in July, predominantly occupied by Allocatelliglobosispora. The stochastic forest model found the key characteristic bacterial populations that can distinguish the four key growth periods of sugarcane. It may help us to answer some pending questions about the interaction of rhizosphere microorganisms with plants in the future.

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Floristic and structural diversity of riverine forest remnants in the Pampa biome

Orlandi,

Silva,

Toldi

et al. 2024

Acta Bot. Bras.

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Grassland community structure in Permanent Preservation Areas associated with forestry and livestock in the Pampa biome, Southern Brazil

Cited by 3 publications

References 21 publications

Influence of different soil uses in the Pampa biome, southern Brazil, on fungal communities

Influence of different soil uses in the Pampa biome, southern Brazil, on fungal communities

Sugarcane Rhizosphere Bacteria Community Migration Correlates with Growth Stages and Soil Nutrient

Floristic and structural diversity of riverine forest remnants in the Pampa biome

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