Are soil-water functions affected by biochar application?

Gerardo Ojeda; Stefania Mattana; Anna Àvila; Josep Maria Alcañiz; Martin Volkmann; Jörg Bachmann

doi:10.1016/j.geoderma.2015.02.014

Details

Original language	English
Pages (from-to)	1-11
Number of pages	11
Journal	GEODERMA
Volume	249-250
Publication status	Published - 1 Jul 2015

Abstract

Today biochar is considered a stable-carbon source that is able to improve soil quality. However, although biochar effects on some soil properties are already becoming well known, its impact on complex soil hydrological functions has yet to be better assessed. The main objectives are: (a) to determine the impact of different biochar amendments on important physical and chemical soil properties and (b) to determine whether the origin (biomass or sewage sludge) and pyrolysis technique can change biochar properties and regulate biochar influence on important soil functions, i.e. nutrient release, water sorption, and carbon storage. Six types of biochar produced from different biomass sources (pine, poplar or sludge) and pyrolysis processes (slow, fast or gasification) were applied to a sandy-loam, low-organic-matter, calcareous soil (mean dose: 18. g/kg) and incubated in a greenhouse without seeding. Two sampling campaigns, one month and one year after biochar amendments, were performed. The overall impact of biochar, analysed by principal response curves (PRCs), indicated that it could improve or deteriorate soil hydrological properties at different intensities. Soil wettability was modified due to sludge biochar addition to soil by increased water penetration dynamics during the capillary rise process of about 18%. In contrast, water storage as a soil function during soil drying was not affected. Because no differences on aggregate stability were observed between treatments, increments on soil organic carbon could not be related to biochar physical protection caused by aggregate formation or by enhanced aggregate stability. As a result, carbon storage, considered as a soil function provided by biochar, was mainly related to its chemical stability. On the other hand, nutrient flux during soil slaking was improved, increasing nutrient release from soil to water. In terms of biochar properties, an increment of surface wettability of biochar during water drop penetration was observed after one year of its addition to soil, where the mean values of contact angle (CA) decreased 69.5%. This important result suggest that initial biochar hydrophobicity (CA. >. 90°) disappeared after 1. year. It was observed that PRC analysis was able to identify important key soil properties that should be monitored when biochar is used as soil amendment. We conclude that the impact of biochar on soil functions depends mainly on biochar feedstock rather than on the pyrolysis technique used during its production. In general, the performance of biochar obtained from sludge and vegetal biomass was markedly different.

Keywords

Biochar, Contact angle, Nutrient flux, Soil organic carbon, Soil slaking, Soil-water retention

ASJC Scopus subject areas

Agricultural and Biological Sciences(all)
Soil Science

Cite this

Are soil-water functions affected by biochar application? / Ojeda, Gerardo; Mattana, Stefania; Àvila, Anna et al.
In: GEODERMA, Vol. 249-250, 01.07.2015, p. 1-11.

Research output: Contribution to journal › Article › Research › peer review

Ojeda, G, Mattana, S, Àvila, A, Alcañiz, JM, Volkmann, M & Bachmann, J 2015, 'Are soil-water functions affected by biochar application?', GEODERMA, vol. 249-250, pp. 1-11. https://doi.org/10.1016/j.geoderma.2015.02.014

Ojeda, G., Mattana, S., Àvila, A., Alcañiz, J. M., Volkmann, M., & Bachmann, J. (2015). Are soil-water functions affected by biochar application? GEODERMA, 249-250, 1-11. https://doi.org/10.1016/j.geoderma.2015.02.014

Ojeda G, Mattana S, Àvila A, Alcañiz JM, Volkmann M , Bachmann J. Are soil-water functions affected by biochar application? GEODERMA. 2015 Jul 1;249-250:1-11. doi: 10.1016/j.geoderma.2015.02.014

Ojeda, Gerardo ; Mattana, Stefania ; Àvila, Anna et al. / Are soil-water functions affected by biochar application?. In: GEODERMA. 2015 ; Vol. 249-250. pp. 1-11.

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@article{899e16a5585840eb9f9882ed16eaf5d6,

title = "Are soil-water functions affected by biochar application?",

abstract = "Today biochar is considered a stable-carbon source that is able to improve soil quality. However, although biochar effects on some soil properties are already becoming well known, its impact on complex soil hydrological functions has yet to be better assessed. The main objectives are: (a) to determine the impact of different biochar amendments on important physical and chemical soil properties and (b) to determine whether the origin (biomass or sewage sludge) and pyrolysis technique can change biochar properties and regulate biochar influence on important soil functions, i.e. nutrient release, water sorption, and carbon storage. Six types of biochar produced from different biomass sources (pine, poplar or sludge) and pyrolysis processes (slow, fast or gasification) were applied to a sandy-loam, low-organic-matter, calcareous soil (mean dose: 18. g/kg) and incubated in a greenhouse without seeding. Two sampling campaigns, one month and one year after biochar amendments, were performed. The overall impact of biochar, analysed by principal response curves (PRCs), indicated that it could improve or deteriorate soil hydrological properties at different intensities. Soil wettability was modified due to sludge biochar addition to soil by increased water penetration dynamics during the capillary rise process of about 18%. In contrast, water storage as a soil function during soil drying was not affected. Because no differences on aggregate stability were observed between treatments, increments on soil organic carbon could not be related to biochar physical protection caused by aggregate formation or by enhanced aggregate stability. As a result, carbon storage, considered as a soil function provided by biochar, was mainly related to its chemical stability. On the other hand, nutrient flux during soil slaking was improved, increasing nutrient release from soil to water. In terms of biochar properties, an increment of surface wettability of biochar during water drop penetration was observed after one year of its addition to soil, where the mean values of contact angle (CA) decreased 69.5%. This important result suggest that initial biochar hydrophobicity (CA. >. 90°) disappeared after 1. year. It was observed that PRC analysis was able to identify important key soil properties that should be monitored when biochar is used as soil amendment. We conclude that the impact of biochar on soil functions depends mainly on biochar feedstock rather than on the pyrolysis technique used during its production. In general, the performance of biochar obtained from sludge and vegetal biomass was markedly different.",

keywords = "Biochar, Contact angle, Nutrient flux, Soil organic carbon, Soil slaking, Soil-water retention",

author = "Gerardo Ojeda and Stefania Mattana and Anna {\`A}vila and Alca{\~n}iz, {Josep Maria} and Martin Volkmann and J{\"o}rg Bachmann",

note = "Funding information: This research was carried out as part of the SOCARRAT project (contract AGL2009-12343 of the Spanish Ministry of Science and Innovation). The authors wish to thank the Funda{\c c}{\~a}o para a Ci{\^e}ncia e Tecnologia — the European Social and National Funds (POPH & QREN) (SFRH/BPD/36371/2007) and Universidad Nacional de Colombia sede Palmira — Colciencias (FP44842-138-2015) for financial support through the postdoctoral grants to Gerardo Ojeda.",

year = "2015",

month = jul,

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doi = "10.1016/j.geoderma.2015.02.014",

language = "English",

volume = "249-250",

pages = "1--11",

journal = "GEODERMA",

issn = "0016-7061",