Influence of pH and temperature on microbial activity, substrate availability of soil-solution bacteria and leaching of dissolved organic carbon in a mor humus

Andersson, Stefan; Nilsson, Staffan

doi:10.1016/s0038-0717(01)00022-0

Cited by 235 publications

(111 citation statements)

References 32 publications

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“…At first glance, the microbially-mediated degradation of labile components in pyOM during summer seemed plausible and was supported to some extent by the fact that most of the loss in carbon and nitrogen (between sampling days 42 and 84) coincided with a 4-5 • C increase in air temperature from 31 to 36 • C (Supplementary Figure 10). These temperatures, as well as their observed increase during periods of highest carbon and nitrogen loss, were well within the range for optimal soil microbial activity and (all else being constant) would be expected to trigger increased microbial activity (Andersson and Nilsson, 2001;Liang et al, 2003).…”

Section: Dynamics Of Pyom-associated Carbon and Nitrogenmentioning

confidence: 53%

Physical Processes Dictate Early Biogeochemical Dynamics of Soil Pyrogenic Organic Matter in a Subtropical Forest Ecosystem

et al. 2018

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Quantifying links between pyOM dynamics, environmental factors and processes is central to predicting ecosystem function and response to future perturbations. In this study, changes in carbon (TC), nitrogen (TN), pH, and relative recalcitrance (R 50 ) for pineand cordgrass-derived pyOM were measured at 3-6 weeks intervals throughout the first year of burial in the soil. Objectives were to (1) identify key environmental factors and processes driving early-stage pyOM dynamics, and (2) develop quantitative relationships between environmental factors and observed changes in pyOM properties. The study was conducted in sandy soils of a forested ecosystem within the Longleaf pine range of the United States with a focus on links between changes in pyOM properties, fire history (FH), cumulative precipitation (P cum ), average temperature (T avg ) and soil residence time (SRT). P cum , SRT and T avg were the main factors controlling TC and TN accounting for 77-91% and 64-96% of their respective variability. Fire history, along with P cum , SRT and T avg , exhibited significant controlling effects on pyOM pH and R 50 -accounting for 48-91% and 88-93% of respective variability. Volatilization of volatiles and leaching of water-soluble components (in summer) and the sorption of exogenous organic matter (fall through spring) were most plausibly controlling pyOM dynamics in this study. Overall, our results point to climatic and land management factors and physicochemical process as the main drivers of pyOM dynamics in the pine ecosystems of the Southeastern US.

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Section: Dynamics Of Pyom-associated Carbon and Nitrogenmentioning

confidence: 53%

Physical Processes Dictate Early Biogeochemical Dynamics of Soil Pyrogenic Organic Matter in a Subtropical Forest Ecosystem

et al. 2018

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“…[22] On the basis of field simulation, it was established that antibacterial antibiotics led to slight pH displacement to acidic region and fungicidal antibiotics to basic region. Probably, soil acidity varied either due to direct chemical action of antibiotics decomposition (metabolites) or due to transformation under the impact of microbial community, and hence, its biochemical impact on soil.…”

Section: Resultsmentioning

confidence: 99%

Untitled

Akimenko¹

2017

AJP

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Objective: Wide-scale application of numerous antibiotics with various chemical compositions and spectra in medicine, agriculture, and food industry is accompanied by violation of microbial community in various ecosystems. Therefore, the resistance of microbial community of soils to contamination with antibiotics widely applied in medicine and agriculture (tylosin and oxytetracycline) has been assessed. Antibiotic contamination leads to decrease in the count of main ecotrophic groups of microorganisms, variation of their ratio, and structure of microbial community in total. Materials and Methods: Maximum impact of antibiotics was exposed in the 1 st day after contamination of chernozem (3 days). Later (30 and 90 days), the trend of recovery of biological performances was observed, and dynamics of recovery of both microorganisms and enzyme activity was nonlinear. Results: In terms of resistance to antibiotics, the considered microorganisms could be ranged as follows: Micromycetes >p. Azotobacter bacteria > amylolytic bacteria > ammonifiers. Comparison of laboratory and field simulation of antibiotic contamination of chernozem revealed that the rate of deterioration of biological performances was more pronounced under laboratory conditions in comparison with the field. Conclusion: The recovery rate of chernozem biological activity after field contamination was higher more than by 2 times. Probably, this could be attributed to the fact that in the field environment antibiotics were decomposed more rapidly under climatic impacts.

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“…However, in tropical areas and especially on tropical coasts, a number of additional climatic and biologic factors facilitate the precipitation of aragonite and calcite and can result in the deposition of formations much more convincingly speleothem-like than the amorphous moonmilk. Because the source of soil CO 2 is microbial activity, which correlates with the temperature (Andersson & Nilsson, 2001), the tropical soil atmosphere can reach CO 2 partial pressures much higher than in other climates. The amount of dissolved organic carbon in the soil is also positively correlated with the soil moisture content (Christ & David, 1996), which is high in the humid tropical areas.…”

Section: Discussionmentioning

confidence: 99%

Littoral dripstone and flowstone--non-spelean carbonate secondary deposits

Taboroši¹,

Stafford²

2003

IJS

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Speleothem-like dripstone and flowstone deposits can form in the non-spelean environments of marine notches on tropical carbonate coastlines. Hereby termed "littoral dripstone" and "littoral flowstone" to distinguish them from genuine cave deposits, they reflect the basic speleothem types: draperies, stalactites, stalagmites, and columns. Nevertheless, these formations lack the luster and crystallinity of cave analogues, and are not nearly as well-developed, dense, and massive. They are composed of layered microcrystalline aragonite and calcite, are generally highly porous, and invariably overlie dissolutional and bioerosional karren. Because true speleothems, often found in the remnants of solution voids breached by coastal erosion, are also commonly present in the modern littoral environments on tropical carbonate islands, they could be confused with littoral dripstone and flowstone deposits. The distinction between the two is crucial, because the true speleothems are indicators of karst cave paleoenvironments, while littoral dripstone and flowstone are contemporary parts of the modern coastal landscape.

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Influence of pH and temperature on microbial activity, substrate availability of soil-solution bacteria and leaching of dissolved organic carbon in a mor humus

Cited by 235 publications

References 32 publications

Physical Processes Dictate Early Biogeochemical Dynamics of Soil Pyrogenic Organic Matter in a Subtropical Forest Ecosystem

Physical Processes Dictate Early Biogeochemical Dynamics of Soil Pyrogenic Organic Matter in a Subtropical Forest Ecosystem

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Littoral dripstone and flowstone--non-spelean carbonate secondary deposits

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