Biochar Presence in Soil Significantly Decreased Saturated Hydraulic Conductivity Due to Swelling.

0499005 - ÚCHP 2019 RIV NL eng J - Článek v odborném periodiku
Jačka, L. - Trakal, L. - Ouředníček, P. - Pohořelý, Michael - Šípek, Václav
Biochar Presence in Soil Significantly Decreased Saturated Hydraulic Conductivity Due to Swelling.
Soil & Tillage Research. Roč. 184, DEC 2018 (2018), s. 181-185. ISSN 0167-1987. E-ISSN 1879-3444
Institucionální podpora: RVO:67985858 ; RVO:67985874
Klíčová slova: biochar * saturated hydraulic conductivity * swelling
Obor OECD: Chemical process engineering; Hydrology (UH-J)
Impakt faktor: 4.675, rok: 2018

The application of biochar on two contrasting soils was tested in order to assess its effects on soil hydraulic properties (SHP) and study the interaction between water and the biochar surface (e.g., the swelling effect). Two contrasting soil types were enriched with 0, 2 and 5% (wt.) doses of grape stalks biochar in order to prepare soil samples for a 14-days continually saturated laboratory experiment. H2O bonds to the biochar surface were detected using FTIR spectroscopy. Results show that water molecules were bound through polar hydrogen bonds to O–H and C–O–H, and these interactions caused (i) intensive swelling, which decreased the bulk density and enhanced the water holding capacity (up to 5% in the case of sandy loam and 5% biochar dose), and (ii) significantly decreased Ks in both soils (with a maximum difference of 82.6%). The results of this laboratory experiment provide useful information about the significant effect of presented biochar in two contrasting soils, and its application appears to be an potential option for addressing drought (especially in coarser soils). Nevertheless, these findings must be verified under field conditions where the presence of biota and long-term effects can be taken into account.
Trvalý link: http://hdl.handle.net/11104/0291320