干旱区生态环境知识资源中心(Arid): Effects of biochar on soil water retention curves of compacted clay during wetting and drying

Arid

DOI	10.1007/s42773-021-00125-y
	Effects of biochar on soil water retention curves of compacted clay during wetting and drying
	Wong, James Tsz Fung; Chow, Ka Lai; Chen, Xun Wen; Ng, Charles Wang Wai; Wong, Ming Hung
通讯作者	Ng, CWW
来源期刊	BIOCHAR
ISSN	2524-7972
EISSN	2524-7867
出版年	2022
卷号	4 期号:1
英文摘要	Compacted clay possesses a low water permeability and has been widely used in geo-environmental facilities such as landfill cover systems. Recent studies revealed the potential applications of compacted biochar-amended clay (BAC) as an alternative landfill cover soil. However, the effects of biochar on the soil water retention curves (SWRCs) of clay at low suction are not known. This study can help fill this knowledge gap by measuring the wetting and drying SWRCs of clay and BAC (20% biochar). Soils were compacted in instrumented soil columns and subjected to a wetting and drying cycle, and soil water content and suction were measured along with the soil depth. BAC was saturated faster when compared with clay. Upon drying, the soil water content of clay at 65 mm depth dropped to almost zero, while about 5% of water was retained in BAC. It showed that biochar increased the soil water retention capacity of compacted clay upon drying. SWRCs showed that biochar-clay composite possesses a higher soil water retention capacity at a low soil suction range (< 1000 kPa) compared with clay alone. It revealed the benefits of using compacted biochar-clay composite as a hydraulic barrier to minimize desiccation-induced cracks and potentially promote its serviceability, especially in arid and semi-arid regions. The composite is also a carbon sink material that can reduce landfill gas emissions and pollutant leaching.
英文关键词	Soil amendment Biochar-clay composite Soil carbon Soil suction Soil depth
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000744509300001
WOS关键词	LANDFILL FINAL COVER ; HYDRAULIC CONDUCTIVITY ; AMENDED CLAY ; BEHAVIOR ; PERMEABILITY ; PERFORMANCE
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376179
推荐引用方式 GB/T 7714	Wong, James Tsz Fung,Chow, Ka Lai,Chen, Xun Wen,et al. Effects of biochar on soil water retention curves of compacted clay during wetting and drying[J],2022,4(1).
APA	Wong, James Tsz Fung,Chow, Ka Lai,Chen, Xun Wen,Ng, Charles Wang Wai,&Wong, Ming Hung.(2022).Effects of biochar on soil water retention curves of compacted clay during wetting and drying.BIOCHAR,4(1).
MLA	Wong, James Tsz Fung,et al."Effects of biochar on soil water retention curves of compacted clay during wetting and drying".BIOCHAR 4.1(2022).