干旱区生态环境知识资源中心(Arid): Sodium-rich water containing calcite can stabilize soil macroaggregates in arid regions

Arid

DOI	10.1016/j.still.2023.105775
	Sodium-rich water containing calcite can stabilize soil macroaggregates in arid regions
	Safar, Fatima; Whalen, Joann K.
通讯作者	Whalen, JK
来源期刊	SOIL & TILLAGE RESEARCH
ISSN	0167-1987
EISSN	1879-3444
出版年	2023
卷号	232
英文摘要	Sodium-rich water may deteriorate calcite-stabilize soil. The objective of this work was to determine whether calcite solution prepared with sodium-rich water were capable of forming stable soil macroaggregates. Calcite solutions were 2.6 g Ca2+ L-1 of CaCO3 mixed with water containing 2.6, 5 or 10 g Na+ L-1 from NaCl. Arid desert soil (5 cm layer, packed at 1.1 g cm-3) was moistened with calcite solution at 50% or 75% of the water holding capacity. Then, the calcite-treated soil was incubated for up to 30 d at average 35 degrees C and 19% relative air humidity. Clay flocculation rate was estimated from the decline in extractable Ca2+ and Na+ concentrations during macroaggregate formation. We observed carbonate precipitation in voids of the macroaggregates using micro-CT scanning, which is evidence of cementation. Aggregate stability was the mean weight diameter of macroaggregates. Macroaggregate stability depends upon calcite interactions with clay, so a higher proportion of Ca2+ to Na+ favors the formation of flocculants and cements the flocculants within macroaggregates with car-bonate materials, which is surmised to be sodium carbonate with low resistance to abrasion. There was 40% more cementing material within macroaggregates treated with pure calcite and Ca2+: Na+ solutions than with solutions containing Ca2+: 2 Na+, Ca2+: 4 Na+ and Na+. We conclude that calcite-stabilized macroaggregates will persist longer when formed by a calcite solution with equal proportions of Ca2+:Na+, since macroaggregates disintegrate more quickly when formed from calcite made with brackish water at ratios of Ca2+ <= 2 Na+.
英文关键词	Aridisols Mean weight diameter Flocculation Cementation Micro X-ray computed tomography
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001009279500001
WOS关键词	PRECIPITATION ; SALINITY ; SIZE ; IONS
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/398668
推荐引用方式 GB/T 7714	Safar, Fatima,Whalen, Joann K.. Sodium-rich water containing calcite can stabilize soil macroaggregates in arid regions[J],2023,232.
APA	Safar, Fatima,&Whalen, Joann K..(2023).Sodium-rich water containing calcite can stabilize soil macroaggregates in arid regions.SOIL & TILLAGE RESEARCH,232.
MLA	Safar, Fatima,et al."Sodium-rich water containing calcite can stabilize soil macroaggregates in arid regions".SOIL & TILLAGE RESEARCH 232(2023).