Elsevier

Pedosphere

Volume 25, Issue 5, October 2015, Pages 770-780
Pedosphere

Soil Microbial Responses to Biochars Varying in Particle Size, Surface and Pore Properties

https://doi.org/10.1016/S1002-0160(15)30058-8Get rights and content

Abstract

Biochars are known for their heterogeneity, especially in pore and surface structure associated with pyrolysis processes and sources of feedstocks. The surface area of biochar is likely to be an important determinant of the extent of soil microbial attachment, whereas the porous structure of biochar is expected to provide protection for soil microorganisms. Potential interactions between biochars from different sources and with different particle sizes were investigated in relation to soil microbial properties in a short-term incubation study. Three particle size (sieved) fractions (0.5–1.0, 1.0–2.0 and 2.0–4.0 mm) from three woody biochars produced from jarrah wood, jarrah and wandoo wood and Australian wattle branches, respectively, were incubated in soil at 25 °C for 56 d. Observation by scanning electron microscopy (SEM) and characterisation of pore and surface area showed that all three woody biochars provided potential habitats for soil microorganisms due to their high porosity and surface areas. The biochars were structurally heterogeneous, varying in porosity and surface structure both within and between the biochar sources. After the 56-d incubation, hyphal colonisation was observed on biochar surfaces and in larger biochar pores. Soil clumping occurred on biochar particles, cementing and covering exposed biochar pores. This may have altered surface area and pore availability for microbial colonisation. Transient changes in soil microbial biomass, without a consistent trend, were observed among biochars during the 56-d incubation.

References (55)

  • J Murphy et al.

    A modified single solution method for the determination of phosphate in natural waters

    Anal Chim Acta

    (1962)
  • D Özcimen et al.

    Characterization of biochar and bio-oil samples obtained from carbonization of various biomass materials

    Renew Energ

    (2010)
  • S P Sohi et al.

    A review of biochar and its use and function in soil

  • M Uchimiya et al.

    Contaminant immobilization and nutrient release by biochar soil amendment: Roles of natural organic matter

    Chemosphere

    (2010)
  • E D Vance et al.

    An extraction method for measuring soil microbial biomass C

    Soil Biol Biochem

    (1987)
  • J Wu et al.

    Measurement of soil microbial biomass C—an automated procedure

    Soil Biol Biochem

    (1990)
  • J P E Anderson

    Soil respiration

  • C J Atkinson et al.

    Potential mechanisms for achieving agricultural benefits from biochar application to temperate soils: a review

    Plant Soil

    (2010)
  • A Badalyan et al.

    Analysis of uncertainties in manometric gas-adsorption measurements. I: Propagation of uncertainties in BET analyses

    Langmuir

    (2003)
  • E P Barrett et al.

    The determination of pore volume and area distributions in porous substances. 1. Computations from nitrogen isotherms

    J Am Chem Soc

    (1951)
  • P Blackwell et al.

    Effect of banded biochar on dryland wheat production and fertiliser use in south-western Australia: an agronomic and economic perspective

    Soil Res

    (2010)
  • P Blackwell et al.

    Biochar application to soil

  • W J Braida et al.

    Sorption hysteresis of benzene in charcoal particles

    Environ Sci Technol

    (2002)
  • S Brunauer et al.

    Adsorption of gases in multimolecular layers

    J Am Chem Soc

    (1938)
  • K Y Chan et al.

    Agronomic values of greenwaste biochar as a soil amendment

    Soil Res

    (2007)
  • K Y Chan et al.

    Using poultry litter biochars as soil amendments

    Soil Res

    (2008)
  • C Cheng et al.

    Stability of black carbon in soils across a climatic gradient

    J Geophys Res

    (2008)
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