Influence of cadmium on the metabolic quotient, l - :  d -glutamic acid respiration ratio and enzyme activity : microbial biomass ratio under laboratory conditions

Landi, L.; Renella, Giancarlo; Moreno, J.L.; Falchini, L.; Nannipieri, Paolo

doi:10.1007/s003740000205

Cited by 146 publications

(64 citation statements)

References 32 publications

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“…The ratio of enzymatic activity to MBC indicates the enzyme production per unit of microbial biomass (Landi et al, 2000). The β−glucosidase activity to MBC ratio was higher for the control and lower for the treatments with compost (Figure 4), as also verified by Bastida et al (2008).…”

Section: Resultssupporting

confidence: 65%

Microbial and enzymatic activity in soil after organic composting

Vinhal-Freitas

Wangen

Ferreira

et al. 2010

Rev. Bras. Ciênc. Solo

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Microbial activity and biochemical properties are important indicators of the impact of organic composting on soil. The objective of this study was to evaluate some indicators of soil microbial and biochemical processes after application of compost (household waste). A Typic Acrustox, sampled at a depth of 10 cm under Cerrado biome vegetation, was evaluated in three treatments: control (soil without organic compost amendment) and soil with two doses of domestic organic compost (10 and 20 g kg -1 soil). The following properties were evaluated: released C (C-CO 2 ): microbial respiration 15 days after incubation; microbial biomass C (MBC); total glucose (TG); metabolic quotient (qCO 2 ); and enzyme activity of β− β− β− β− β−glucosidase and acid and alkaline phosphatase. The application of household compost, at doses of 10 and 20 g kg -1 Typic Acrustox, resulted in significant gains in microbial activity, organic C and C stock, as evidenced by increased MBC and TG levels. On the other hand, qCO 2 decreases indicated greater microbial diversity and more efficient energy use. The addition of compost, particularly the 20 g kg -1 dose, strongly influenced the enzyme β− β− β− β− β−glucosidase and phosphatase (acid and alkaline). The β− β− β− β− β−glucosidase activity was significantly increased and acid phosphatase activity increased more than the alkaline. The ratio of β− β− β− β− β−glucosidase to MBC was greater in the control than in the composted treatments which suggests that there were more enzymes in the control than in the substrate or that the addition of compost induced a great MBC increase.Index terms: Cerrado, Soil respiration, microbial biomass, glucose, phosphatase, β− β− β− β− β−glucosidase.(

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Section: Resultssupporting

confidence: 65%

Microbial and enzymatic activity in soil after organic composting

Vinhal-Freitas

Wangen

Ferreira

et al. 2010

Rev. Bras. Ciênc. Solo

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“…In this study, we have applied a new approach that relates enzyme activities to the number of active (FDA-stained) bacteria. This ratio is an alternative to previously used ratios of enzymatic activity to total bacterial biomass measurements, which include dead and dormant cells (Landi et al 2000). This provides the possibility to qualitatively link the observed enzyme activities to microbial processes.…”

Section: Resultsmentioning

confidence: 99%

Effects of pioneering plants on microbial structures and functions in a glacier forefield

et al. 2007

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This study investigates the small-scale spatial impact of the pioneering plant Leucanthemopsis alpina (L.) Heywood (L. alpina) on biological and chemical-physical parameters in an early successional stage of a glacier forefield. Considering the frequent occurrence of isolated patches of this pioneer plant in the forefield of the Dammaglacier (Switzerland), we hypothesized that the impact of the plant would establish gradients in nutrients, and microbial community structure and activity that may be of importance for the successional processes occurring in the forefield. Our results indicated that, in young successional soils, the rhizosphere effect of L. alpina plant patches can influence bacterial cell numbers and activities not only within the root zone, but even at 20 cm distance from the plant. Microbial cell counts, active cells, and saccharase, glucosidase, and acid phosphatase activities revealed significant distance effects, decreasing from soil directly underneath the plant to soils at 20 and 40 cm distance. Soil chemical and physical parameters did not exhibit significant trends. Fingerprinting analysis of amplified 16S rDNA fragments was used to characterize the microbial community. A selective effect of the plant on the microbial community could not be shown because the bacterial communities were similar regardless of distance to the plant.

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“…These ratios decreased significantly with the fire. Landi et al (2000) indicated that the ratio between activity parameters and microbial biomass represents a single combination of two different measurements in a single criterion that can give some indications of changes occurring in microbiological activity and ecological information on specific aspects of microbial activity. An increasing ratio may indicate either increasing enzyme production and enzyme release by microorganisms or enhanced release of enzymes immobilized on clay or humic colloids to the soil solution (Kandeler and Eder 1993).…”

Section: Discussionmentioning

confidence: 99%

Short-Term Effect of Fire Severity in Chemical and Biochemical Soil Properties in a Sandy Soil

Turrión

Lafuente

Mulas

2011

Environmental Science and Engineering

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The objectives of the study were to determine how fire severity influences some chemical and biochemical soil properties and to evaluate which properties are more sensitive to this factor. Two forest burned areas and their corresponding unburned areas in Valladolid Province (Spain) were selected. The vegetation in both areas was mixed forest plantation of Pinus pinea L. and Pinus pinaster Aiton, with Albic Arenosols. The fires occurred in June 2004 and the samples at 0-2 cm were taken five months later. Sampling was stratified on the basis of fire severity, defining three levels (high, moderate and low) based on pine canopy consumption, organic litter layer quantity and aspect, and ash quantity and color. In soil samples, pH, total soil organic C (SOC), Walkley-Black C (C W-B ), total nitrogen (N), available P (P Olsen ), microbial activity (C min ), microbial biomass C and P (MBC and MBP), and acid and alkaline phosphatase activity were determined. SOC and total N concentrations increased in burned soils from external inputs. Fire increased P Olsen concentrations from their incorporation into the soil as ash. Our results showed a significant increase in C min , MBC and MBP in burned plots, indicating that at least a part of the microbial community is favored by nutrient availability and pH increases. These fires caused a short-term fertilizing effect in the plots studied due to the very low soil fertility and the low temperature reached.

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Influence of cadmium on the metabolic quotient, l - : d -glutamic acid respiration ratio and enzyme activity : microbial biomass ratio under laboratory conditions

Cited by 146 publications

References 32 publications

Microbial and enzymatic activity in soil after organic composting

Microbial and enzymatic activity in soil after organic composting

Effects of pioneering plants on microbial structures and functions in a glacier forefield

Short-Term Effect of Fire Severity in Chemical and Biochemical Soil Properties in a Sandy Soil

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