Different composition and distribution patterns of mineral-protected versus hydrolyzable lipids in shrubland soils

doi:10.1016/j.scitotenv.2017.06.057

	Different composition and distribution patterns of mineral-protected versus hydrolyzable lipids in shrubland soils
	Cai, Yue 1; Tang, Zhiyao 2; Xiong, Gaoming ; Xie, Zongqiang1 ; Liu, Zongguang ; Feng, Xiaojuan1
	2017
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN	2169-8953
卷号	122 期号:9 页码:2206-2218
摘要	Mineral protection is known as an important mechanism stabilizing soil organic carbon (SOC). However, the composition, sources, and variations of mineral-protected SOC remain poorly constrained. To fill this knowledge gap, we used hydrofluoric acid to demineralize soil matrix and compared the sources and distribution of mineral-protected lipids (ML) versus hydrolyzable lipids (HL) of four typical Chinese shrubland soils. ML was found to represent a sizable fraction (9-32%) of total aliphatic lipids (including n-alkanols; n-alkanoic acids; ,-alkanedioic acids; hydroxyalkanoic acids; and midchain-substituted acids) in all soils. Based on carbon chain length and branch positions, microbe- and plant-derived lipids were distinguished. No significant difference was found in the ratio of microbe- to plant-derived lipids in ML versus HL, implying that plant and microbial inputs are equally important for the mineral-associated soil lipids. However, ML contained a higher proportion of nonspecific lipids, especially at depths. Furthermore, to evaluate key environmental variable(s) controlling the distribution of different lipid components, a multiple stepwise regression analysis was conducted. Notably, ML was mainly affected by SOC-to-nitrogen ratio instead of mineralogical properties, implying that the accrual of mineral-associated soil lipids relies strongly on organic matter properties. Collectively, our findings provide novel insights on sources and accumulation mechanisms of mineral-protected soil lipids. SOC decomposition and subsequent accretion of degradation products appear to be vital for the sequestration of mineral-associated soil lipids and warrant better recognition in the investigations of stable soil carbon accumulation mechanisms.
关键词	physical protection cutin and suberin microbial carbon environmental influences accumulation mechanism
学科领域	Environmental Sciences & Ecology
DOI	10.1016/j.scitotenv.2017.06.057
收录类别	SCI
语种	英语
WOS关键词	ORGANIC-MATTER ; FOREST SOIL ; CARBON STORAGE ; MICROBIAL COMMUNITIES ; LITTER DECOMPOSITION ; AGRICULTURAL SOIL ; ALIPHATIC LIPIDS ; SIZE FRACTIONS ; DYNAMICS ; PLANT
WOS记录号	WOS:000408755300136
出版者	AMER GEOPHYSICAL UNION
文献子类	Article
出版地	WASHINGTON
EISSN	2169-8961
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41422304, 31370491] ; National Thousand Young Talents recruiting plan of China
作者邮箱	xfeng@ibcas.ac.cn
作品OA属性	Green Accepted
引用统计	被引频次：65[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/22083
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China 3.Peking Univ, Dept Ecol, Coll Urban & Environm Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Cai, Yue,Tang, Zhiyao,Xiong, Gaoming,et al. Different composition and distribution patterns of mineral-protected versus hydrolyzable lipids in shrubland soils[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2017,122(9):2206-2218.
APA	Cai, Yue,Tang, Zhiyao,Xiong, Gaoming,Xie, Zongqiang,Liu, Zongguang,&Feng, Xiaojuan.(2017).Different composition and distribution patterns of mineral-protected versus hydrolyzable lipids in shrubland soils.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,122(9),2206-2218.
MLA	Cai, Yue,et al."Different composition and distribution patterns of mineral-protected versus hydrolyzable lipids in shrubland soils".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 122.9(2017):2206-2218.

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
28738512.pdf（1756KB）	期刊论文	出版稿	开放获取	CC BY-NC-SA	浏览请求全文