干旱区生态环境知识资源中心(Arid): Evaluating mechanism and inconsistencies in hydraulic conductivity of unsaturated soil using newly proposed biochar conductivity factor

Arid

DOI	10.1007/s42773-023-00233-x
	Evaluating mechanism and inconsistencies in hydraulic conductivity of unsaturated soil using newly proposed biochar conductivity factor
	Garg, Ankit; Zhu, Hong-Hu; Sarmah, Ajit K.; Mei, Guoxiong; Gadi, Vinay Kumar
通讯作者	Zhu, HH
来源期刊	BIOCHAR
ISSN	2524-7972
EISSN	2524-7867
出版年	2023
卷号	5 期号:1
英文摘要	In the past few decades, numerous studies have been conducted to promote the use of biochar as a soil amendment and most recently, for compacted geo-engineered soils. In general, the definite trends of biochar effects on water retention and fertility of soils have been confirmed. However, the biochar effects on hydraulic conductivity, particularly unsaturated hydraulic conductivity of soil-biochar mix remain unclear, making it difficult to understand water seepage in both agricultural and geo-engineered infrastructures in semi-arid regions. This study examines the unsaturated hydraulic conductivity function derived based on the measurements of soil water characteristic curves of soil with biochar contents of 0%, 5% and 10%. A new parameter biochar conductivity factor (BCF) is proposed to evaluate the inconsistency in reported biochar effects on soil hydraulic conductivity and to interpret it from various mechanisms (inter- and intra- pore space filling, cracking, aggregation, bio-film formation and piping/internal erosion). The impact of biochar content on unsaturated hydraulic conductivity appears to reduce as the soil becomes drier with minimal effect in residual zone. Qualitative comparison of near-saturated hydraulic conductivity with test results in the literature showed that the BCF is generally higher for smaller ratio of sand to fine content (clay and silt). Moreover, the particle size of biochar may have significant influence on soil permeability. Future scope of research has been highlighted with respect to biochar production for its applications in agriculture and geo-environmental engineering. Long term effects such as root decay and growth, aggregation and nutrient supply need to be considered. New biochar conductivity factor (BCF) is defined to explore hydraulic conductivity of biochar amended soils.BCF is generally higher for smaller ratio of sand to fine content (clay and silt).Pore filling, aggregation, bio-film formation and piping in soils due to biochar is discussed.Lack of systematic studies revealing effects of physio-chemical properties of biochar on hydraulic conductivity.
英文关键词	Biochar conductivity factor (BCF) Unsaturated hydraulic conductivity Soil water characteristic curve (SWCC) Pyrolysis process
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:001118378400001
WOS关键词	WATER-RETENTION ; SANDY SOIL ; IMPACT ; PERMEABILITY ; INFILTRATION ; PARAMETERS ; AMENDMENT ; ADDITIONS ; QUALITY ; AIR
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/2XILL650/395538
推荐引用方式 GB/T 7714	Garg, Ankit,Zhu, Hong-Hu,Sarmah, Ajit K.,et al. Evaluating mechanism and inconsistencies in hydraulic conductivity of unsaturated soil using newly proposed biochar conductivity factor[J],2023,5(1).
APA	Garg, Ankit,Zhu, Hong-Hu,Sarmah, Ajit K.,Mei, Guoxiong,&Gadi, Vinay Kumar.(2023).Evaluating mechanism and inconsistencies in hydraulic conductivity of unsaturated soil using newly proposed biochar conductivity factor.BIOCHAR,5(1).
MLA	Garg, Ankit,et al."Evaluating mechanism and inconsistencies in hydraulic conductivity of unsaturated soil using newly proposed biochar conductivity factor".BIOCHAR 5.1(2023).