干旱区生态环境知识资源中心(Arid): Archaeal lipids in soils and sediments: Water impact and consequences for microbial carbon sequestration

Arid

DOI	10.1016/j.soilbio.2022.108801
	Archaeal lipids in soils and sediments: Water impact and consequences for microbial carbon sequestration
	Pei, Hongye; Yang, Huan; Kuzyakov, Yakov; Dang, Xinyue; Zang, Jingjie; Zhao, Shijin; Huang, Miao; Wang, Canfa; Xie, Shucheng
通讯作者	Xie, SC
来源期刊	SOIL BIOLOGY & BIOCHEMISTRY
ISSN	0038-0717
EISSN	1879-3428
出版年	2022
卷号	173
英文摘要	The mineral protection of microbial necromass is critical for soil carbon stabilization. The water impact on the interactions between minerals and microbial necromass, however, remains unclear due to a lack of proper methods to quantify the mineral-protected microbial necromass. Here, we used offline hydrous pyrolysis to release the archaeal necromass-isoprenoid glycerol dialkyl glycerol tetraethers (isoGDGTs) bound to clay minerals by heating samples at increasing temperatures (150, 200, 250, 300, and 350 C) under argon atmo-sphere. The content of extractable isoGDGTs in soils reached the maximum at 200-250 C, indicating the release of bound isoGDGTs. By investigating the free and bound isoGDGTs along a soil transect with increasing soil water content (SWC), we found that the portion of bound isoGDGTs reached up to 97% of total isoGDGTs in dry soils, and decreased with increased SWC, suggesting that SWC controls isoGDGT stabilization on clay minerals. This relationship was confirmed in the soils from the Northeast China Transect, where the proportion of bound isoGDGTs decreased with increased mean annual precipitation from 160 to 814 mm. Such a connection was further supported by the water-saturated samples of the lake and marine sediments, which have a much lower proportion of bound lipids than the soils. The decrease of bound lipid portion with increasing water content is related to the lower attachment of microbial cells to minerals in wetter soils. Microbial cells are more strongly attached to the mineral phase under drier conditions due to the thin water film on the mineral surfaces. In addition, microorganisms secrete more extracellular polymeric substances under drier conditions, which re-inforces the interactions between microbial-derived organic matter and minerals. The increased microbe-mineral interactions under drier conditions offer more stable microbial legacies and stabilize organic matter in the (semi) arid regions.
英文关键词	isoGDGTs Microbial necromass Offline pyrolysis Mineral-organic interfaces Semi-arid ecosystems
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000861006400003
WOS关键词	DIALKYL GLYCEROL TETRAETHERS ; PROKARYOTIC MEMBRANE-LIPIDS ; ORGANIC-MATTER ; CLAY INTERACTION ; TEMPERATE SOILS ; CLIMATE-CHANGE ; POROUS-MEDIA ; LAKE ; PRESERVATION ; MICROORGANISMS
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/2XILL650/394507
推荐引用方式 GB/T 7714	Pei, Hongye,Yang, Huan,Kuzyakov, Yakov,et al. Archaeal lipids in soils and sediments: Water impact and consequences for microbial carbon sequestration[J],2022,173.
APA	Pei, Hongye.,Yang, Huan.,Kuzyakov, Yakov.,Dang, Xinyue.,Zang, Jingjie.,...&Xie, Shucheng.(2022).Archaeal lipids in soils and sediments: Water impact and consequences for microbial carbon sequestration.SOIL BIOLOGY & BIOCHEMISTRY,173.
MLA	Pei, Hongye,et al."Archaeal lipids in soils and sediments: Water impact and consequences for microbial carbon sequestration".SOIL BIOLOGY & BIOCHEMISTRY 173(2022).