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[1]TU Dan,MAO Tianxu.Effect of Biochar Addition on Saturated Hydraulic Conductivity of Yellow Soil in Karst Area[J].Research of Soil and Water Conservation,2021,28(05):108-113.

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Effect of Biochar Addition on Saturated Hydraulic Conductivity of Yellow Soil in Karst Area

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 05 Page number: 108-113 Column: Public date: 2021-08-20

Title:: Effect of Biochar Addition on Saturated Hydraulic Conductivity of Yellow Soil in Karst Area

Author(s):: TU Dan,MAO Tianxu; (College of Forestry,Guizhou University,Guizhou 550025,China)

Keywords:: biochar; yellow soil; field water holding capacity; capillary water holding capacity; saturated hydraulic conductivity

CLC:: S152.7

DOI:: -

Abstract:: In order to explore the effect of biochar addition on the saturated hydraulic conductivity of yellow soil in Karst sloping farmland,soil bulk density,porosity,water holding capacity and saturated hydraulic conductivity were determined under the treatments of the corn straw biochar(CSB)and rice husk biochar(RHB)addition with different amounts(0,1%,2%,3%)and different particle sizes(0.25 mm,0.25～1 mm,and> 1 mm). The results showed that the addition of biochar significantly reduces the soil bulk density. Compared with the control(CK),the additions of CSB and RHB reduce the soil bulk density by 5.13% and 4.85%,respectively,the soil bulk density shows the decreasing trend with the increase of the addition,the corresponding total soil porosity and capillary porosity show the increasing trend. The field water holding capacities(FMC)of the soils with CSB and RHB addition increase by 5.30% and 4.72%,and the capillary water holding capacities(CWC)increase by 4.75% and 6.60%,respectively. With the increase of the amount of biochar and the increase in particle size,the FMC and CWC increase. The change of saturated hydraulic conductivity is related to the particle size of biochar. Compared with CK,the saturated hydraulic conductivities reduces by 11.74% and 21.74% at the CSB and RHB addition with particle size < 0.25 mm,increase by 66.67% and 33.33% with particle size of >1 mm respectively. With the addition of biochar with particle size of 0.25～1 mm,there is no obvious change in the saturated hydraulic conductivity. This study indicates that the biochar addition can significantly reduce soil bulk density,increase soil field water holding capacity and capillary water holding capacity,and improve soil water conductivity. The research results can provide a theoretical basis for the application of biochar.

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Last Update: 2021-08-20