scholarly journals Increases of Temperature Response for CO2 Emission in a Biochar-Amended Vegetable Field Soil

2021 ◽  
Author(s):  
Rong Huang ◽  
Zifang Wang ◽  
Yi Xiao ◽  
Luo Yu ◽  
Xuesong Gao ◽  
...  
Keyword(s):  
Co2 Emission ◽  
Soil Microbial Biomass ◽  
Temperature Response ◽  
Chemical Fertilizer ◽  
Short Term ◽  
Plant System ◽  
Soil Microbial ◽  
Vegetable Field ◽  
One Year ◽  
Biochar Amendment

Abstract To explore the effects of biochar application on CO2 and CH4 emission as well as the temperature response of CO2 emission, an one-year experiment was conducted with three treatments (Control; CF, chemical fertilizer only; BCF, biochar combined with chemical fertilizer) in a vegetable field. Results shown that (1) compared with CF, short-term application of biochar significantly enhancing the cumulative CO2 emission by 27.5% from soil-plant system, via increasing the soil microbial biomass (e.g., MBC) and C substrates (e.g., SOC). (2) A lowest emission of CH4 was observed in BCF treatment, and an increase CH4 consumption and reduce competition with NH4+ may be responsible for the significant reduction in CH4 source strength in biochar amended soil. (3) Activation energy (Ea) was identified as an important factor influencing the temperature sensitivity (Q10) of CO2 emission. Fertilization (CF and BCF) reduced the average Q10 and Ea values of CO2 emission by 9.0-26.7% and 23.5-10.1%, relative to the control, respectively. Besides, the average of Ea value in BCF treatment (51.9 KJ mol-1) was significantly higher than those in control and CF treatment. The increase in Q10 and Ea values following biochar application possibly contributed to the supplement of limit labile C and nutrient but highly resistant C following biochar application. Soil pH and crop cultivation may play key roles in influencing the change of Ea. Our study concludes that biochar amendment increased CO2 emission and temperature response of CO2 emission from soil-plant system, while reduced CH4 emission.

scholarly journals The Influence of Selected Meteorological Factors on Microbial Biomass and Mineralization of Two Organic Fertilizers

2011 ◽  
Vol 39 (1) ◽  
pp. 107
Author(s):  
Mignon S. SANDOR ◽  
Traian BRAD ◽  
Aurel MAXIM ◽  
Constantin TOADER
Keyword(s):  
Biological Activity ◽  
Microbial Biomass ◽  
Soil Ph ◽  
Soil Microbial Biomass ◽  
Organic Fertilizers ◽  
Barley Straw ◽  
Short Term ◽  
Soil Microbial ◽  
Fertilized Soil ◽  
Mineralization Processes

A mesocosm study was conducted in order to evaluate the effects of short-term rainfall and temperature variation on soil microbial biomass and bacteria to fungi ratio. In addition, the relation between the decomposition process of two organic fertilizers, cattle manure and barley straw, and the activity of soil microbial biomass was also studied. In order to assess the effect of biological activity on soil fertility the dynamics of soil pH, N-NO3-, N-NH4+, Corg and Nt during plant growing season was measured. The results suggest that short-term variation of climate had a significant effect on microbial biomass with dry periods distinguished by a reduced microbial biomass compared to wet periods. The ratio bacteria to fungi seems also to be sensitive to variations in rainfall and temperature regime, however further studies are required to draw a definitive conclusion. Regarding the type of fertilizer used, the straw treatments showed higher microbial biomass than the manure treatments, but higher decomposition rate was observed in manure fertilized soil. The effect of soil biological activity on soil pH was limited for both manure and straw treatments while the changes of the soil nitrate amounts are related to the microbial biomass. The study indicates that nitrate immobilization and mineralization processes are influenced by meteorological conditions and microbial biomass dynamics. In contrast, soil organic carbon and total nitrogen did not seem to be affected by variations in temperature, rainfall and microbial activity.

Short-term application of mulch, roundup and organic herbicides did not affect soil microbial biomass or bacterial and fungal diversity

Chemosphere ◽  
2020 ◽  
Vol 244 ◽  
pp. 125436 ◽  
Author(s):  
Donnaleigh Bottrill ◽  
Steven M. Ogbourne ◽  
Nadine Citerne ◽  
Tanzi Smith ◽  
Michael B. Farrar ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Fungal Diversity ◽  
Soil Microbial Biomass ◽  
Short Term ◽  
Soil Microbial

Time-course of the soil microbial biomass under wheat: A one year field study

1994 ◽  
Vol 26 (8) ◽  
pp. 987-994 ◽  
Author(s):  
Rainer Georg Joergensen ◽  
Brunk Meyer ◽  
Torsten Mueller
Keyword(s):  
Microbial Biomass ◽  
Field Study ◽  
Time Course ◽  
Soil Microbial Biomass ◽  
Soil Microbial ◽  
One Year

scholarly journals Short term changes of microbial processes in Icelandic soils to increasing temperatures

2010 ◽  
Vol 7 (2) ◽  
pp. 671-682 ◽  
Author(s):  
R. Guicharnaud ◽  
O. Arnalds ◽  
G. I. Paton
Keyword(s):  
Microbial Biomass ◽  
Organic Carbon ◽  
Soil Temperature ◽  
Temperature Regime ◽  
Soil Microbial Biomass ◽  
Microbial Biomass Carbon ◽  
Biomass Carbon ◽  
Labile Carbon ◽  
Short Term ◽  
Soil Microbial

Abstract. Temperature change is acknowledged to have a significant effect on soil biological processes and the corresponding sequestration of carbon and cycling of nutrients. Soils at high latitudes are likely to be particularly impacted by increases in temperature. Icelandic soils experience unusually frequent freeze and thaw cycles compare to other Arctic regions, which are increasing due to a warming climate. As a consequence these soils are frequently affected by short term temperature fluctuations. In this study, the short term response of a range of soil microbial parameters (respiration, nutrient availability, microbial biomass carbon, arylphosphatase and dehydrogenase activity) to temperature changes was measured in sub-arctic soils collected from across Iceland. Sample sites reflected two soil temperature regimes (cryic and frigid) and two land uses (pasture and arable). The soils were sampled from the field frozen, equilibrated at −20 °C and then incubated for two weeks at −10 °C, −2 °C, +2 °C and +10 °. Respiration and enzymatic activity were temperature dependent. The soil temperature regime affected the soil microbial biomass carbon sensitivity to temperatures. When soils where sampled from the cryic temperature regime a decreasing soil microbial biomass was detected when temperatures rose above the freezing point. Frigid soils, sampled from milder climatic conditions, where unaffected by difference in temperatures. Nitrogen mineralisation did not change with temperature. At −10 °C, dissolved organic carbon accounted for 88% of the fraction of labile carbon which was significantly greater than that recorded at +10 °C when dissolved organic carbon accounted for as low as 42% of the labile carbon fraction.

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