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Changes of saturated hydraulic conductivity values of soils with different percetnages of biochar during recurrent laboratory measurements
Bočinský, Pavel ; Jačka, Lukáš (advisor) ; Pavlásek, Jiří (referee)
Abstract
This thesis deal with the influence of biochar on the saturated hydraulic conductivity (Ks) and time changes of Ks during the recurrent of measurement procedure. Representative values of Ks are crucial for description and modeling of the water low in the soil. Samples used in this thesis represent laboratory-prepared soil (fluvial soil fine grained soil with the addition of 20% kaolin clay). This soil has been enriched by 0, 2 and 5% of biochar. For these different materials, values of Ks and its time changes were determined values using recurrent laboratory measurements. Biochar (material used for improvement of sorption capacity and other soil properties) was made by pyrolysis of grape stalk.
Measurements were performed in two series, in January and February 2016. Every series contains ten samples, therefore, twenty samples in two series were measured. Samples were poured into Kopeckeho sampling rings (100cm3). First series contains five samples of fine soil, each sample with 5% addition of biochar to reference soil; the remaining five samples contain reference soil (fluvial soil with 20% addition of clay). Second series contains five samples of fine soil, each sample with 2 % addition of biochar to reference soil; the remaining five samples contain reference soil. Saturation of samples was done gradually by a regulator of laboratory permeameter. Samples were measured using the laboratory permeameter by constant head method.
Average values of Ks for samples without biochar (first series), were in range from 1,00.10-7 until do 3,53.10-7 m.s-1. Average values of Ks for 5% biochar, were in range from 6,49.10-8 until 9,20.10-8 m.s-1. For the first series, the mean Ks values of the samples with the 5% biochar addition were every time distinctly lower than mean Ks values for the reference soil. Average values of Ks for samples without biochar (second series), were in range from 1,21.10-7 until 1,84.10-7 m.s-1. Average values of Ks for 2% biochar, were in range from 9,78.10-8 until 1,64.10-7 m.s-1.
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