Microbial quality of soil from the Pampa biome in response to different grazing pressures

Vargas, Rafael S.; Bataiolli, Renata; Costa, Pedro Beschoren da; Lisboa, Bruno Brito; Passaglia, Luciane Maria Pereira; Beneduzi, Anelise; Vargas, Luciano Kayser

doi:10.1590/s1415-475738138120140230

Cited by 17 publications

(8 citation statements)

References 31 publications

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“…Enzymes are sensitive indicators showing microbial activity in soils [13]. Biological activity is a criterion to determine the effects of cultivation [14], field management [15] or soil contamination [16]. Soil biological activities are affected by soil tillage, crop rotation, and cover crops [17].…”

Section: Introductionmentioning

confidence: 99%

Relationships between Cement Dust Emissions and Soil Properties

Bilen¹,

Bilen²,

Turan³

2019

Pol. J. Environ. Stud.

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Composite soils from conventional tillage (CT) and no-till (NT) fields under wheat (Triticum vulgare cultivar Dogu-88) were randomly collected (0-30 cm depth) in triplicate at 1, 5, 10, 15, 20 and 25 km distance to evaluate the effects of cement dust on soil basal respiration, microbial populations, enzyme activity and calculated soil quality (SQ) indices. Soil pH, exchangeable Ca and Mg, CaCO 3 , and alkaline phosphatase (AlkP) showed a significant linear decrease in total organic C (TOC), total C (TC), urease activity (UA), and bacterial populations, and soil biological quality (SBQ) showed a significant linear increase with sampling distance from the cement plant. Total N (TN), available P (AP), basal respiration (BR), acid phosphate (AcdP) activity, dehydrogenase (DH) activity, fungal populations, and SQ showed a quadratic response with sampling distance. Soil pH, CaCO 3 , TOC effective CEC, SBQ, soil chemical quality (SCQ), and SQ were significantly influenced by increasing distance.

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Section: Introductionmentioning

confidence: 99%

Relationships between Cement Dust Emissions and Soil Properties

Bilen¹,

Bilen²,

Turan³

2019

Pol. J. Environ. Stud.

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“…The Pampa Biome covers an area in the southern of South America that is spread in Brazil, Argentina and Uruguay (Lupatini et al, 2013; Vargas et al, 2015). This biome is considered priority for flora and fauna conservation due to its huge biodiversity (Overbeck et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Bacterial and Archaeal Communities Change With Intensity of Vegetation Coverage in Arenized Soils From the Pampa Biome

et al. 2019

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Arenization occurs in regions that present sandy soils with normal rainfall levels. Predatory use of environmental sources, the dissolution of arenitic rocks and reworking of non-consolidated surface sands intensify this degradation scenario. Thus, this work aimed to evaluate the impact of the arenization process in the Brazilian Pampa Biome and how this phenomenon affects the soil microbial and plant communities. For this purpose, three arenized areas in Southern Brazil (Pampa Biome) were selected and, in each one, three sampling points were studied: arenized (ARA), arenized to grassland transition (AGT), and grassland (GRA) areas. In the three sampling points, soils presented low levels of nutrients, organic matter, mud and pH acidic in all regions but, the presence of vegetation coverage in AGT and GRA areas preserved the topsoil structure. Our study related ARA with bacterial families Alcaligenaceae , Pseudomonadaceae , and Xanthomonadaceae . AGT with bacterial families Bacillaceae and Burkholderiaceae , and plant species Melinis repens (Willd.) Zizka and Paspalum stellatum Humb. and Bonpl. ex Flüggé, and GRA with bacterial families Koribacteraceae , Hyphomicrobiaceae , and Chthoniobacteraceae , and plant species Croton subpannosus Müll.Arg. ex Griseb., Piptochaetium montevidense (Spreng.) Parodi and Elyonurus sp. The three studied areas (as well as sampling points) present soils extremely poor in nutrients with sandy texture, and the bacterial and plant composition well known to be resistant to environmental stresses were dominant. The vulnerability of these areas causes a degradation scenario, which is worsened by agricultural activities. However, in general, this phenomenon is a natural process that occurs mainly due to soil characteristics (poor soils) and climatic variations.

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“…Several studies have shown that fertilization and grazing can affect grassland ecosystem composition and stability [6,11,48]. Yang et al [7] found that increasing the level of N increased the community stability on the Tibetan Plateau over 10 years.…”

Section: Effects Of Fertilization and Grazing On Community Stabilitymentioning

confidence: 99%

Long-Term Enclosure Can Benefit Grassland Community Stability on the Loess Plateau of China

et al. 2020

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Fertilization and grazing are two common anthropogenic disturbances that can lead to unprecedented changes in biodiversity and ecological stability of grassland ecosystems. A few studies, however, have explored the effects of fertilization and grazing on community stability and the underlying mechanisms. We conducted a six-year field experiment to assess the influence of nitrogen (N) fertilization and grazing on the community stability in a long-term enclosure and grazing grassland ecosystems on the Loess Plateau. A structural equation modeling method was used to evaluate how fertilization and grazing altered community stability. Our results indicated that the community stability decreased in the enclosure and grazing grassland ecosystems with the addition of N. The community stability began to decline significantly at 4.68 and 9.36 N g m−2 year−1 for the grazing and enclosure grassland ecosystems, respectively. We also found that the addition of N reduced the community stability through decreasing species richness, but a long-term enclosure can alleviate its negative effect. Overall, species diversity can be a useful predictor of the stability of ecosystems confronted with disturbances. Also, our results showed that long-term enclosure was an effective grassland management practice to ensure community stability on the Loess Plateau of China.

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Microbial quality of soil from the Pampa biome in response to different grazing pressures

Cited by 17 publications

References 31 publications

Relationships between Cement Dust Emissions and Soil Properties

Relationships between Cement Dust Emissions and Soil Properties

Bacterial and Archaeal Communities Change With Intensity of Vegetation Coverage in Arenized Soils From the Pampa Biome

Long-Term Enclosure Can Benefit Grassland Community Stability on the Loess Plateau of China

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