Does biochar improve soil water retention? A systematic review and meta-analysis

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Does biochar improve soil water retention? A systematic review and meta-analysis. / Razzaghi, Fatemeh; Obour, Peter Bilson; Arthur, Emmanuel.

I: Geoderma, Bind 361, 114055, 03.2020.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisReviewForskningpeer review

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Razzaghi, Fatemeh ; Obour, Peter Bilson ; Arthur, Emmanuel. / Does biochar improve soil water retention? A systematic review and meta-analysis. I: Geoderma. 2020 ; Bind 361.

Bibtex

@article{6c622b0f86e8499dbd8d8d41efa0e137,
title = "Does biochar improve soil water retention? A systematic review and meta-analysis",
abstract = "Biochar is widely suggested as a soil amendment to improve soil physical properties for crop production. However, the heterogeneity between experiments in terms of biochar characteristics, experimental conditions and soil properties makes it difficult to compare and extrapolate results from different studies. We conducted a statistical meta-analysis of literature published between 2010 and 2019, and quantified biochar's impacts on soil bulk density (BD) and water retention variables, namely, soil water content held at field capacity (FC), wilting point (WP) and plant available water content (AW). Across all soil textural groups, biochar on average decreased BD by 9%. FC and WP significantly increased for the coarse-textured soils (by 51% and 47%, respectively), and moderately for the medium-textured soils (by 13% and 9%, respectively). For the fine-textured soils, FC remained unchanged (<1%), but WP marginally decreased by 5%. Biochar significantly increased AW in the coarse-textured soils (by 45%) compared to the medium- and fine-textured soils (by 21% and 14%, respectively) suggesting that biochar may have greater benefit on coarse-textured soils. We introduced a novel parameter called {\textquoteleft}biochar carbon added{\textquoteright}, estimated from biochar carbon content and the rate of application, which can be useful to make a sound comparison of biochar impacts on soil physical properties reported in different case studies when variable biochar attributes, experimental conditions and soil types have been used. The meta-analysis highlights again the need to provide adequate information on biochar experiments and soil water retention variables to allow better elucidation of the underlying mechanisms of biochar's impact on soil water retention and more.",
keywords = "Biochar added carbon, Biochar characteristics, Bulk density, Experimental conditions, Soil textural classes, Soil water content, PHYSICAL-PROPERTIES, HYDROLOGICAL PROPERTIES, PYROLYSIS TEMPERATURES, HYDRAULIC-PROPERTIES, SUGARCANE BAGASSE, 5-YEAR FIELD TRIAL, ORGANIC-CARBON, STRUCTURAL-PROPERTIES, RICE-HUSK BIOCHAR, DIFFERENT FEEDSTOCKS",
author = "Fatemeh Razzaghi and Obour, {Peter Bilson} and Emmanuel Arthur",
year = "2020",
month = mar,
doi = "10.1016/j.geoderma.2019.114055",
language = "English",
volume = "361",
journal = "Geoderma",
issn = "0016-7061",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - Does biochar improve soil water retention? A systematic review and meta-analysis

AU - Razzaghi, Fatemeh

AU - Obour, Peter Bilson

AU - Arthur, Emmanuel

PY - 2020/3

Y1 - 2020/3

N2 - Biochar is widely suggested as a soil amendment to improve soil physical properties for crop production. However, the heterogeneity between experiments in terms of biochar characteristics, experimental conditions and soil properties makes it difficult to compare and extrapolate results from different studies. We conducted a statistical meta-analysis of literature published between 2010 and 2019, and quantified biochar's impacts on soil bulk density (BD) and water retention variables, namely, soil water content held at field capacity (FC), wilting point (WP) and plant available water content (AW). Across all soil textural groups, biochar on average decreased BD by 9%. FC and WP significantly increased for the coarse-textured soils (by 51% and 47%, respectively), and moderately for the medium-textured soils (by 13% and 9%, respectively). For the fine-textured soils, FC remained unchanged (<1%), but WP marginally decreased by 5%. Biochar significantly increased AW in the coarse-textured soils (by 45%) compared to the medium- and fine-textured soils (by 21% and 14%, respectively) suggesting that biochar may have greater benefit on coarse-textured soils. We introduced a novel parameter called ‘biochar carbon added’, estimated from biochar carbon content and the rate of application, which can be useful to make a sound comparison of biochar impacts on soil physical properties reported in different case studies when variable biochar attributes, experimental conditions and soil types have been used. The meta-analysis highlights again the need to provide adequate information on biochar experiments and soil water retention variables to allow better elucidation of the underlying mechanisms of biochar's impact on soil water retention and more.

AB - Biochar is widely suggested as a soil amendment to improve soil physical properties for crop production. However, the heterogeneity between experiments in terms of biochar characteristics, experimental conditions and soil properties makes it difficult to compare and extrapolate results from different studies. We conducted a statistical meta-analysis of literature published between 2010 and 2019, and quantified biochar's impacts on soil bulk density (BD) and water retention variables, namely, soil water content held at field capacity (FC), wilting point (WP) and plant available water content (AW). Across all soil textural groups, biochar on average decreased BD by 9%. FC and WP significantly increased for the coarse-textured soils (by 51% and 47%, respectively), and moderately for the medium-textured soils (by 13% and 9%, respectively). For the fine-textured soils, FC remained unchanged (<1%), but WP marginally decreased by 5%. Biochar significantly increased AW in the coarse-textured soils (by 45%) compared to the medium- and fine-textured soils (by 21% and 14%, respectively) suggesting that biochar may have greater benefit on coarse-textured soils. We introduced a novel parameter called ‘biochar carbon added’, estimated from biochar carbon content and the rate of application, which can be useful to make a sound comparison of biochar impacts on soil physical properties reported in different case studies when variable biochar attributes, experimental conditions and soil types have been used. The meta-analysis highlights again the need to provide adequate information on biochar experiments and soil water retention variables to allow better elucidation of the underlying mechanisms of biochar's impact on soil water retention and more.

KW - Biochar added carbon

KW - Biochar characteristics

KW - Bulk density

KW - Experimental conditions

KW - Soil textural classes

KW - Soil water content

KW - PHYSICAL-PROPERTIES

KW - HYDROLOGICAL PROPERTIES

KW - PYROLYSIS TEMPERATURES

KW - HYDRAULIC-PROPERTIES

KW - SUGARCANE BAGASSE

KW - 5-YEAR FIELD TRIAL

KW - ORGANIC-CARBON

KW - STRUCTURAL-PROPERTIES

KW - RICE-HUSK BIOCHAR

KW - DIFFERENT FEEDSTOCKS

UR - http://www.scopus.com/inward/record.url?scp=85076055079&partnerID=8YFLogxK

U2 - 10.1016/j.geoderma.2019.114055

DO - 10.1016/j.geoderma.2019.114055

M3 - Review

AN - SCOPUS:85076055079

VL - 361

JO - Geoderma

JF - Geoderma

SN - 0016-7061

M1 - 114055

ER -