干旱区生态环境知识资源中心(Arid): Use of biochar to manage soil salts and water: Effects and mechanisms

Arid

DOI	10.1016/j.catena.2022.106018
	Use of biochar to manage soil salts and water: Effects and mechanisms
	Lee, Xinqing; Yang, Fang; Xing, Ying; Huang, Yimin; Xu, Liang; Liu, Zhongtang; Holtzman, Ran; Kan, Iddo; Li, Yunlong; Zhang, Like; Zhou, Hui
通讯作者	Lee, XQ
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2022
卷号	211
英文摘要	Soil salinization is a widespread land degredation, especially in water-stressed regions, jeopardizing agriculture sustainability. Current desalinization methodology involves excessive water consumption. Biochar has the potential to mitigate soil salinization while increasing water holding capacity. As a saline and sodic material, however, how it works and whether it can be used to sustain the agriculture at reduced water resource remain to be studied. Here, by monitoring transport of water, salts and nutrients in the profile of irrigation-silt soil during watering and evaporation in both laboratory and field in Kashgar oasis, Xinjiang, China, we find biochar exacerbates salinization upon application. This is changed, however, after several cycles of irrigation-evaporation due to strengthened salt leaching in irrigation and salt removal out of the depth through intensified top accumulation by evaporation, both resulting from increased capillary effect and thereby the enhanced movement of salts despite the competing electrical adsorption to the cations. The resulted salt distribution facilitates desalinization by removing the top 2 cm soil. Biochar also promotes evaporation after irrigation due to inceased water content and capillary suction. This is reversed once the soil cracks, a common phemomenon in irrigated land. Biochar counteracts the cracking through alleviation of soil compaction, saving tillage while lowering water evaporation, e.g., by 43% at 10% biochar. Our findings indicate that application of biochar changes salt distribution, enabling desalinization with little water consumption. Together with the effect of anti-fracturing and enhanced salt leaching, it lowers water demand substantially, providing a novel solution for agricultural sustainability in salt-affected regions.
英文关键词	Salt-affected soil Land degradation Water conservation Salinization Desalinization
类型	Article
语种	英语
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:000790443800002
WOS关键词	PYROLIGNEOUS SOLUTION ; CARBON DYNAMICS ; MANURE COMPOST ; CENTRAL CHINA ; SALINE SOIL ; CONJUNCTION ; TEMPERATURE ; XINJIANG ; INCREASE
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392078
推荐引用方式 GB/T 7714	Lee, Xinqing,Yang, Fang,Xing, Ying,et al. Use of biochar to manage soil salts and water: Effects and mechanisms[J],2022,211.
APA	Lee, Xinqing.,Yang, Fang.,Xing, Ying.,Huang, Yimin.,Xu, Liang.,...&Zhou, Hui.(2022).Use of biochar to manage soil salts and water: Effects and mechanisms.CATENA,211.
MLA	Lee, Xinqing,et al."Use of biochar to manage soil salts and water: Effects and mechanisms".CATENA 211(2022).