Effects of slow and fast pyrolysis biochar on soil C and N turnover dynamics

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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Effects of slow and fast pyrolysis biochar on soil C and N turnover dynamics. / Bruun, Esben; Ambus, Per; Egsgaard, Helge; Hauggaard-Nielsen, Henrik.

In: Soil Biology & Biochemistry, Vol. 46, No. 4, 2012, p. 73-79.

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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Author

Bruun, Esben; Ambus, Per; Egsgaard, Helge; Hauggaard-Nielsen, Henrik / Effects of slow and fast pyrolysis biochar on soil C and N turnover dynamics.

In: Soil Biology & Biochemistry, Vol. 46, No. 4, 2012, p. 73-79.

Publication: Research - peer-reviewJournal article – Annual report year: 2011

Bibtex

@article{c4045173affd439d9be4869b63fd72cb,
title = "Effects of slow and fast pyrolysis biochar on soil C and N turnover dynamics",
publisher = "Pergamon",
author = "Esben Bruun and Per Ambus and Helge Egsgaard and Henrik Hauggaard-Nielsen",
year = "2012",
doi = "10.1016/j.soilbio.2011.11.019",
volume = "46",
number = "4",
pages = "73--79",
journal = "Soil Biology & Biochemistry",
issn = "0038-0717",

}

RIS

TY - JOUR

T1 - Effects of slow and fast pyrolysis biochar on soil C and N turnover dynamics

A1 - Bruun,Esben

A1 - Ambus,Per

A1 - Egsgaard,Helge

A1 - Hauggaard-Nielsen,Henrik

AU - Bruun,Esben

AU - Ambus,Per

AU - Egsgaard,Helge

AU - Hauggaard-Nielsen,Henrik

PB - Pergamon

PY - 2012

Y1 - 2012

N2 - This study compared the effect of two principal pyrolysis methods on the chemical characteristics of biochar and the impact on C and N dynamics after soil incorporation. Biochar was produced from wheat straw that was thermally decomposed at 525 °C by slow pyrolysis (SP) in a nitrogen flushed oven and by fast pyrolysis (FP) using a Pyrolysis Centrifuge Reactor (PCR). After 65 days of soil incubation, 2.9% and 5.5% of the SP- and FP-biochar C, respectively, was lost as CO2, significantly less than the 53% C-loss observed when un-pyrolyzed feedstock straw was incubated. Whereas the SP-biochar appeared completely pyrolyzed, an un-pyrolyzed carbohydrate fraction (8.8% as determined by acid released C6 and C5 sugars) remained in the FP-biochar. This labile fraction possibly supported the higher CO2 emission and larger microbial biomass (SMB-C) in the FP-biochar soil. Application of fresh FP-biochar to soil immobilized mineral N (43%) during the 65 days of incubation, while application of SP-biochar led to net N mineralization (7%). In addition to the carbohydrate contents, the two pyrolysis methods resulted in different pH (10.1 and 6.8), particle sizes (113 and 23 μm), and BET surface areas (0.6 and 1.6 m2 g−1) of the SP- and FP-biochars, respectively. The study showed that independently of pyrolysis method, soil application of the biochar materials had the potential to sequester C, while the pyrolysis method did have a large influence on the mineralization-immobilization of soil N.

AB - This study compared the effect of two principal pyrolysis methods on the chemical characteristics of biochar and the impact on C and N dynamics after soil incorporation. Biochar was produced from wheat straw that was thermally decomposed at 525 °C by slow pyrolysis (SP) in a nitrogen flushed oven and by fast pyrolysis (FP) using a Pyrolysis Centrifuge Reactor (PCR). After 65 days of soil incubation, 2.9% and 5.5% of the SP- and FP-biochar C, respectively, was lost as CO2, significantly less than the 53% C-loss observed when un-pyrolyzed feedstock straw was incubated. Whereas the SP-biochar appeared completely pyrolyzed, an un-pyrolyzed carbohydrate fraction (8.8% as determined by acid released C6 and C5 sugars) remained in the FP-biochar. This labile fraction possibly supported the higher CO2 emission and larger microbial biomass (SMB-C) in the FP-biochar soil. Application of fresh FP-biochar to soil immobilized mineral N (43%) during the 65 days of incubation, while application of SP-biochar led to net N mineralization (7%). In addition to the carbohydrate contents, the two pyrolysis methods resulted in different pH (10.1 and 6.8), particle sizes (113 and 23 μm), and BET surface areas (0.6 and 1.6 m2 g−1) of the SP- and FP-biochars, respectively. The study showed that independently of pyrolysis method, soil application of the biochar materials had the potential to sequester C, while the pyrolysis method did have a large influence on the mineralization-immobilization of soil N.

KW - Charcoal

KW - Triticum aestivum

KW - Carbon sequestration

KW - Pyrolysis centrifuge reactor

KW - Nitrogen immobilization

KW - Bio-char

KW - Soil microbial biomass

U2 - 10.1016/j.soilbio.2011.11.019

DO - 10.1016/j.soilbio.2011.11.019

JO - Soil Biology & Biochemistry

JF - Soil Biology & Biochemistry

SN - 0038-0717

IS - 4

VL - 46

SP - 73

EP - 79

ER -