scholarly journals Global pattern and controls of soil microbial metabolic quotient

2017 ◽  
Vol 87 (3) ◽  
pp. 429-441 ◽  
Author(s):  
Xiaofeng Xu ◽  
Joshua P. Schimel ◽  
Ivan A. Janssens ◽  
Xia Song ◽  
Changchun Song ◽  
...  
Keyword(s):  
Metabolic Quotient ◽  
Global Pattern ◽  
Soil Microbial ◽  
Microbial Metabolic Quotient

Soil Microbial Metabolic Quotient in Inner Mongolian Grasslands: Patterns and Influence Factors

2019 ◽  
Vol 29 (6) ◽  
pp. 1001-1010 ◽  
Author(s):  
Yingqiu Cao ◽  
Li Xu ◽  
Zhen Zhang ◽  
Zhi Chen ◽  
Nianpeng He
Keyword(s):  
Influence Factors ◽  
Metabolic Quotient ◽  
Soil Microbial ◽  
Microbial Metabolic Quotient

scholarly journals Soil microbial metabolism and invertase activity under crop rotation and no-tillage in North China

2013 ◽  
Vol 59 (No. 11) ◽  
pp. 511-516 ◽  
Author(s):  
Hu JL ◽  
Zhu AN ◽  
Wang JH ◽  
J. Dai ◽  
Wang JT ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
North China ◽  
Soil Microbial Biomass ◽  
Invertase Activity ◽  
Metabolic Quotient ◽  
Microbial Biomass C ◽  
No Tillage ◽  
Soil Microbial Biomass C ◽  
Soil Microbial ◽  
Microbial Metabolic Quotient

Soil samples were collected at both jointing and maturing stages of maize and wheat to compare the effects of 4-year no-tillage (NT) and conventional tillage (CT) on seasonal variations of microbial biomass carbon (C), metabolic quotient, and invertase activity in a sandy loam soil in North China. Soil invertase activity significantly increased (P < 0.05) from summer to spring of the next year and then significantly decreased (P < 0.05) from spring to summer. With a delay of about 3 months, soil microbial biomass C and basal respiration altered in a similar pattern, while microbial metabolic quotient changed on the contrary. Compared with CT, the NT practice significantly increased (P < 0.05) soil organic C content, and tended to result in higher soil microbial biomass C and invertase activity, as well as lower soil microbial metabolic quotient, especially at the jointing stage of maize. Our results indicated that NT might play an important role in the improvement of soil microbial efficiency, especially at the maize seedling season.

scholarly journals Industrial and urban organic wastes increase soil microbial activity and biomass

2012 ◽  
Vol 36 (5) ◽  
pp. 1629-1636 ◽  
Author(s):  
Cácio Luiz Boechat ◽  
Jorge Antonio Gonzaga Santos ◽  
Adriana Maria de Aguiar Accioly ◽  
Marcela Rebouças Bomfim ◽  
Adailton Conceição dos Santos
Keyword(s):  
Sewage Sludge ◽  
Microbial Activity ◽  
Pulp Mill ◽  
Soil Microbial Activity ◽  
Organic Wastes ◽  
Metabolic Quotient ◽  
Municipal Sewage Sludge ◽  
Soil Microbial ◽  
Pulp Mill Sludge ◽  
The Impact

Microbial processes have been used as indicators of soil quality, due to the high sensitivity to small changes in management to evaluate, e.g., the impact of applying organic residues to the soil. In an experiment in a completely randomized factorial design 6 x 13 + 4, (pot without soil and residue or absolute control) the effect of following organic wastes was evaluated: pulp mill sludge, petrochemical complex sludge, municipal sewage sludge, dairy factory sewage sludge, waste from pulp industry and control (soil without organic waste) after 2, 4, 6, 12, 14, 20, 28, 36, 44, 60, 74, 86, and 98 days of incubation on some soil microbial properties, with four replications. The soil microbial activity was highly sensitive to the carbon/nitrogen ratio of the organic wastes. The amount of mineralized carbon was proportional to the quantity of soil-applied carbon. The average carbon dioxide emanating from the soil with pulp mill sludge, corresponding to soil basal respiration, was 0.141 mg C-CO2 100 g-1 soil h-1. This value is 6.4 times higher than in the control, resulting in a significant increase in the metabolic quotient from 0.005 in the control to 0.025 mg C-CO2 g-1 Cmic h-1 in the soil with pulp mill sludge. The metabolic quotient in the other treatments did not differ from the control (p < 0.01), demonstrating that these organic wastes cause no disturbance in the microbial community.

scholarly journals Shifts in soil microbial stoichiometry and metabolic quotient provide evidence for a critical tipping point at 1% soil organic carbon in an agricultural post-mining chronosequence

2021 ◽  
Author(s):  
Jessica Clayton ◽  
Kathleen Lemanski ◽  
Michael Bonkowski
Keyword(s):  
Microbial Biomass ◽  
Agricultural Land ◽  
Land Reclamation ◽  
Critical Value ◽  
Metabolic Quotient ◽  
Microbial Biomass N ◽  
Maintenance Respiration ◽  
C:N:P Stoichiometry ◽  
Soil Microbial ◽  
Microbial N

AbstractSoil microbial C:N:P stoichiometry and microbial maintenance respiration (i.e. metabolic quotient, qCO2) were monitored along a nutrient gradient in soils from a 52-year space-for-time chronosequence of reclaimed agricultural land after brown-coal mining. Land reclamation produced loess soils of initially low (0.2%) SOC. Consecutive agricultural land management led to a gradual recovery of SOC contents. Our data revealed sudden shifts in microbial stoichiometry and metabolic quotient with increasing SOC at a critical value of 1% SOC. As SOC increased, accrual rate of C into microbial biomass decreased, whereas microbial N increased. Simultaneously, metabolic quotient strongly decreased with increasing SOC until the same critical value of 1% SOC and remained at a constant low thereafter. The microbial fractions of the soil in samples containing < 1% SOC were out of stoichiometric equilibrium and were inefficient at immobilising C due to high maintenance respiration. Increasing SOC above the threshold value shifted the soil microbes towards a new equilibrium where N became growth limiting, leading to a more efficient acquisition of C. The shift in microbial N accrual was preluded by high variation in microbial biomass N in soils containing 0.5–0.9% SOC indicative of a regime shift between microbial stoichiometric equilibria. Our data may help in establishing a quantitative framework for SOC targets that, along with agricultural intensification, may better support feedback mechanisms for a sustainable accrual of C in soils.

scholarly journals Bokashi compost and biofertilizer increase lettuce agronomic variables in protected cultivation and indicates substrate microbiological changes

2020 ◽  
pp. 640
Author(s):  
Fernando Teruhiko Hata ◽  
Felipe Alvares Spagnuolob ◽  
Maria Tereza de Paulaa ◽  
Amanda Aleixo Moreiraa ◽  
Mauricio Ursi Venturaa ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Total Mass ◽  
Microbial Biomass Carbon ◽  
Quality Measurement ◽  
Metabolic Quotient ◽  
Quality Data ◽  
Microbial Quality ◽  
Head Diameter ◽  
Soil Microbial ◽  
Basal Soil Respiration

The aim of the study was to evaluate agronomic productive variables of iceberg lettuce and soil microbiological variables for two crop cycles by using organic inputs. The treatments were as follows: control (no fertilization); Bokashi compost (20 g per plant); Penergetic-k plus Penergetic-p bio-activators (both at 1.5 g per litre of water, applied to the substrate and plant, respectively); and biofertilizer at different concentrations (2.5, 5.0, 7.5, and 10% dilutions in water). Biofertilizer concentrations were applied during five fertigation times per day in the first crop experiment and in single daily fertigation in the second crop experiment. Agronomic productive variables evaluated were: total mass, commercial mass, discarded leaves mass, stem diameter, commercial head diameter and plant height. Soil microbial biomass carbon, basal soil respiration and metabolic quotient were evaluated for substrate microbial quality measurement. In the first cycle, plants treated with Bokashi or Penergetic presented superior total mass, commercial mass and commercial head diameter of lettuce, while plants treated with biofertilizer did not exhibit improvement and presented tipburn in some plants, when compared to control. In the second cycle, the use of Bokashi and biofertilizers improved the total mass and commercial head diameter, compared to control. Higher than control microbial biomass was achieved with biofertilizer concentrations and Bokashi. Lower metabolic quotient (qCO2) was observed for all the treatments, when compared to control. Soil microbial quality data corresponded to better lettuce yields.

scholarly journals Microbiological and structural quality of Oxisol under pasture renewal systems

2021 ◽  
Vol 51 ◽  
Author(s):  
Denise Prevedel Capristo ◽  
Gessí Ceccon ◽  
Ricardo Fachinelli ◽  
Michely Tomazi
Keyword(s):  
Crop Production ◽  
Microbial Biomass Carbon ◽  
Microbiological Quality ◽  
Soil Microbial Activity ◽  
Structural Quality ◽  
Soybean Crop ◽  
Soil Microbial ◽  
Microbial Metabolic Quotient ◽  
Medium Texture

ABSTRACT The central Brazilian Savanna biome, known as Cerrado, has a vast area of pastures affected by some degree of degradation, where one of the main challenges is incorporating these areas into a crop production system. This study aimed to evaluate the effect of pasture renewal systems on the microbiological and structural quality of a medium-texture Oxisol. A randomized blocks design was adopted, with four replications and eight pasture renewal systems: 1) soybean/off-season maize/soybean; 2) soybean/maize-grass intercropping/soybean; 3) grass for 10 months and then one soybean crop; 4) grass + rattlepod for 10 months and then one soybean crop; 5) grass for 13 months and then one soybean crop; 6) grass + rattlepod for 13 months and then one soybean crop; 7) one soybean crop; 8) original pasture (control). The microbiological quality was assessed based on soil microbial biomass carbon, soil microbial activity, microbial metabolic quotient - qCO2 and activity of the β-glucosidase enzyme; and the structural quality based on the soil structural quality index. The implementation of pasture renewal systems with grass as a single crop (systems 3 and 5) or intercropped with rattlepod (systems 4 and 6) improves the soil microbiological and structural quality. The pasture renewal system beginning with soybean/off-season maize succession (system 1) is not indicated for the medium-texture soil evaluated in this study.

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