scholarly journals Measuring methods for soil microbial activity and biomass

1984 ◽  
Vol 56 (3) ◽  
pp. 199-203
Author(s):  
Helvi Heinonen-Tanski ◽  
Aila Mettälä ◽  
Riitta Silvo
Keyword(s):  
Microbial Activity ◽  
Metabolic Activity ◽  
Soil Microbial Activity ◽  
Enzymatic Activities ◽  
Measuring Methods ◽  
Soil Microbial ◽  
Cell Components ◽  
Microbial Groups ◽  
Micro Organisms ◽  
Microbial Enzymatic Activities

The determining for the numbers of different soil microbial groups has some technical difficulties because of biological reasons. Therefore the measuring of cell components or metabolic activity of soil micro-organisms is often preferred. The different measuring methods for determining the numbers of micro-organisms or microbial cell components or microbial enzymatic activities will be shortly reviewed.

scholarly journals Soil microbial activity under conventional and organic production of bean and maize

2016 ◽  
pp. 35-43
Author(s):  
Jelena Marinkovic ◽  
Ivan Susnica ◽  
Dragana Bjelic ◽  
Branislava Tintor ◽  
Mirjana Vasic
Keyword(s):  
Microbial Activity ◽  
Farming System ◽  
Soil Microbial Activity ◽  
Organic Production ◽  
Soil Microbial ◽  
Number Of Microorganisms ◽  
Microbiological Parameters ◽  
Set Up ◽  
Organic Farming System ◽  
Micro Organisms

The objective of this study was to compare the effects of conventional and organic production system on microbial activity in the soil cultivated with bean and maize crops. The trial in Djurdjevo was set up according to the conventional farming system, while organic farming system was used in Futog. Two maize hybrids and two bean cultivars were used in the trial. Soil samples were collected in two periods during 2014 (before sowing, at flowering stage of bean crops, and at 9-11 leaf stage of maize) at two depths, at both locations. The following microbiological parameters were tested: the total number of micro?organisms, number of ammonifiers, Azotobacter sp., free nitrogen fixing bacteria, fungi, actinomycetes, and activity of dehydrogenase enzyme. The results showed that the total number of microorganisms, number of free N-fixers and dehydrogenase activity were higher within organic production, while Azotobacter sp. was more abundant in conventional production. Variations in the number of ammonifiers, fungi and actinomycetes in relation to the type of production were not obtained. Significant differences in microbial activity were also obtained between period and depths of sampling.

Short-term response of soil respiration and soil enzymatic activities to biochar application in semiarid agricultural soils under a climate change scenario

2021 ◽  
Author(s):  
Iria Benavente-Ferraces ◽  
Ana Rey ◽  
Marco Panettieri ◽  
Claudio Zaccone ◽  
Gabriel Gascó ◽  
...  
Keyword(s):  
Climate Change ◽  
Soil Respiration ◽  
Microbial Activity ◽  
Temperature Sensitivity ◽  
Soil Microbial Activity ◽  
Enzymatic Activities ◽  
C Mineralization ◽  
Soil C ◽  
Soil Microbial ◽  
Rainfall Reduction

<p>The application of biochar is presumed to be a climate change mitigation strategy in agriculture. However, we still need to better understand the effects of biochar application on soil properties, particularly on soil microbial activity. This is because soil microorganisms play a key role in ecosystems functioning, as they have a central role in soil metabolic activity given that they are responsible for soil organic matter decomposition and nutrient cycling. Conversely, little is known about how climate change will affect the soil microbial activity.</p><p>In a rainfed field experiment, we studied the effect of forecasted warming and rainfall reduction on soil respiration and soil enzymatic activities after 3 years of consecutive application of biochar at a rate of 20 t/ha on a barley-camelina-fallow rotation in a semiarid region in Central Spain. Soil respiration was not affected by the application of biochar or/and warming and rainfall reduction treatments in comparison to the control treatment (no amendment). However, biochar amended soils had lower temperature sensitivity of soil C mineralization in the first two years when soils were cultivated but higher temperature sensitivity of soil C mineralization in the third year during fallow treatment. Enzymes involved in the C and N cycles (dehydrogenase, β-glucosidase and urease) significantly increased their activity under warming and rainfall reduction treatments, albeit biochar application tended to decrease the enzymatic activity under those treatments.</p><p>Acknowledgments: to the Spanish MICINN (MINECO, AEI, FEDER, EU) for supporting the research projects AGL2016-75762-R and CGL2015-65162-R.</p>

scholarly journals Effects of heavy metal concentrations on biological activity of soil micro-organisms

2011 ◽  
Vol 49 (No. 7) ◽  
pp. 321-326 ◽  
Author(s):  
M. Šmejkalová ◽  
O. Mikanová ◽  
L. Borůvka
Keyword(s):  
Heavy Metal ◽  
Microbial Activity ◽  
Soil Microbial Activity ◽  
Soil Microflora ◽  
Significant Inhibition ◽  
Metal Concentrations ◽  
Heavy Metal Concentrations ◽  
Soil Microbial ◽  
Cadmium Lead ◽  
Micro Organisms

The distribution of cadmium, lead and zinc in exchangeable, organic, and 2M HNO3-extractable fractions as well as the effect of heavy metal concentrations on soil microflora was investigated. Six sampling transects were chosen in theLitavkaRiveralluvium in 1999–2001. Concentrations of all metals increased with decreasing distance from the source of contamination. The concentrations of Cd and Zn in exchangeable fraction were higher than in organically bound fraction, a reverse trend was found in Pb speciation. All measured parameters of soil microbial activity were affected by heavy metal concentrations. The decrease in CFU was most significant in the case of oligotrophic bacteria and spore-forming bacteria. Significant inhibition of C-biomass occurred in soils highly contaminated by heavy metals. The Cbiomass:Cox ratio decreased with increasing soil pollution. Generally, the values of enzymatic activities were highest in the soil above the source of contamination and they were decreased as approaching the source of contamination. Our results demonstrate that several parameters of microbial activity could be used as good indicators of increasing concentrations of Cd, Pb, and Zn in soil.

Carbon limitation overrides acidification in mediating soil microbial activity to nitrogen enrichment in a temperate grassland

2021 ◽  
Author(s):  
Qiushi Ning ◽  
Stephan Hättenschwiler ◽  
Xiaotao Lü ◽  
Paul Kardol ◽  
Yunhai Zhang ◽  
...  
Keyword(s):  
Microbial Activity ◽  
Soil Microbial Activity ◽  
Temperate Grassland ◽  
Carbon Limitation ◽  
Nitrogen Enrichment ◽  
Soil Microbial

scholarly journals Influence of xenobiotic contaminants on landfill soil microbial activity and diversity

2012 ◽  
Vol 95 ◽  
pp. S285-S290 ◽  
Author(s):  
M.I. Pérez-Leblic ◽  
A. Turmero ◽  
M. Hernández ◽  
A.J. Hernández ◽  
J. Pastor ◽  
...  
Keyword(s):  
Microbial Activity ◽  
Soil Microbial Activity ◽  
Soil Microbial

Radiorespirometry measurement of the soil microbial activity of trial fields treated with organic fertilizers

1994 ◽  
Vol 46 (1-2) ◽  
pp. 31-36
Author(s):  
Jean Rouchaud ◽  
Fabrice Gustin ◽  
Dany Callens ◽  
Robert Bulcke ◽  
Joel Gillet ◽  
...  
Keyword(s):  
Microbial Activity ◽  
Soil Microbial Activity ◽  
Organic Fertilizers ◽  
Soil Microbial

Effect of deforestation on soil microbial activity

2002 ◽  
Vol 394 (1-2) ◽  
pp. 171-178 ◽  
Author(s):  
E.Elizabeth Sigstad ◽  
Maricel A Bejas ◽  
M Julia Amoroso ◽  
Celina I Garcı́a
Keyword(s):  
Microbial Activity ◽  
Soil Microbial Activity ◽  
Soil Microbial

Effects of Sulfur Fertilization on Soybean Root and Leaf Traits, and Soil Microbial Activity

2008 ◽  
Vol 31 (3) ◽  
pp. 473-483 ◽  
Author(s):  
Yanwen Zhao ◽  
Xin Xiao ◽  
Dongmei Bi ◽  
Feng Hu
Keyword(s):  
Microbial Activity ◽  
Leaf Traits ◽  
Soil Microbial Activity ◽  
Soybean Root ◽  
Soil Microbial ◽  
Sulfur Fertilization
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