Effect of Biochar on Water Infiltration Characteristics of Iimestone Soil in Southwest Karst Area

[Objective] In order to explore the effect of corn straw biochar on water infiltration characteristics of calcareous soil in southwest karst area. [Methods] Five biochar application gradients (0, 2%, 4%, 6%, and 8%), three gravel content soils (10%, 20%, 30%) and no gravel soil were set up to carry...

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Published inShui tu bao chi xue bao Vol. 38; no. 5; pp. 225 - 235
Main Authors YU Hui, FANG Rongjie, YU Jiajun, XU Qinxue, AO Liman, FU Zhiyong, CHEN Hongsong
Format Journal Article
LanguageChinese
Published Editorial Department of Journal of Soil and Water Conservation 01.10.2024
Subjects
biochar
gravel
infiltration characteristics
karst
soil moisture
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Summary:[Objective] In order to explore the effect of corn straw biochar on water infiltration characteristics of calcareous soil in southwest karst area. [Methods] Five biochar application gradients (0, 2%, 4%, 6%, and 8%), three gravel content soils (10%, 20%, 30%) and no gravel soil were set up to carry out one-dimensional water infiltration test. [Results] (1) With the increase of biochar application rate, except for 10% gravel content, the migration depth of the wetting front gradually decreased, and the inhibition effect of adding biochar on gravel soil was weaker than that on non-gravel soil. Taking 60 min as an example, compared with CK (without gravel), it was reduced by 10%～27%, and the three gravel conditions were reduced by 1%～17%, 1%～16%, and 1%～21%, respectively. When the application amount was 8%, the migration depth of each treatment was the smallest. (2) Biochar reduced the cumulative infiltration of lime soil. The cumulative infiltration amount without gravel was 9%～27% lower than that of CK, while
ISSN:1009-2242
DOI:10.13870/j.cnki.stbcxb.2024.05.021