干旱区生态环境知识资源中心(Arid): Latitudinal patterns of particulate and mineral-associated organic matter down the soil profile in drylands

Arid

DOI	10.1016/j.still.2022.105580
	Latitudinal patterns of particulate and mineral-associated organic matter down the soil profile in drylands
	Li, Xiaojuan; Yang, Tinghui; Hicks, Lettice C.; Hu, Bin; Li, Fanglan; Liu, Xin; Wei, Dandan; Wang, Zilong; Bao, Weikai
通讯作者	Bao, WK
来源期刊	SOIL & TILLAGE RESEARCH
ISSN	0167-1987
EISSN	1879-3444
出版年	2023
卷号	226
英文摘要	Understanding the controls on particulate organic matter (POM) and mineral-associated organic matter (MAOM) accumulation is essential in order to accurately predict carbon-climate feedbacks and for ecosystem manage-ment. However, how POM and MAOM fractions vary across latitudinal gradients in dryland ecosystems, and what drives this variation remains unclear. In this study, we sampled soils from 100 natural shrubland sites across a latitudinal gradient (23?N to 32?N) in the dry valleys of southwestern China to identify latitudinal patterns of POM and MAOM fractions at four soil depths (0-10 cm, 10-20 cm, 20-30 cm, and 30-50 cm). We found that both C and N fractions in POM and MAOM exhibited a binomial trend with latitude at all depths, whereas the N fractions in POM and MAOM exhibited a pronounced increase at higher latitudes in subsurface soils (20-30 cm and 30-50 cm). Variation in C fractions (i.e., particulate organic carbon (POC) and mineral -associated organic carbon (MAOC)) were mainly explained by the independent effect of soil properties, with the most important explanatory factor being exchangeable calcium. In contrast, variation in N fractions (i.e., particulate organic nitrogen (PON) and mineral-associated organic nitrogen (MAON)) were largely explained by interactions between soil , climate and vegetation properties, with the most important driver being mean annual temperature and mean annual precipitation for PON, exchangeable calcium for MAON at 0-10 cm and 10-20 cm depths, and mean annual temperature for MAON at 20-30 cm and 30-50 cm soil depths. Interestingly, climate was more important in explaining variation in C and N fractions in the subsurface soils, and climate and vegetation properties had higher predictive power for soil N fractions than C fractions in the subsurface soils. These results advance our understanding of the role of soil properties on SOM accumulation in dryland eco-systems. Our study also highlights the important impact of climate and vegetation properties in explaining the spatial variation of SOM in subsurface soils, which should be incorporated into large-scale assessments to better predict SOM dynamics.
英文关键词	Latitudinal variation Particulate organic matter Mineral -associated organic matter Soil depth arid and semi -arid regions
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000908418900002
WOS关键词	CARBON STORAGE ; TEMPERATURE SENSITIVITY ; PLANT DIVERSITY ; STOCKS ; STABILIZATION ; ACCUMULATION ; DEPENDENCE ; FOREST ; DEPTH
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/2XILL650/398657
推荐引用方式 GB/T 7714	Li, Xiaojuan,Yang, Tinghui,Hicks, Lettice C.,et al. Latitudinal patterns of particulate and mineral-associated organic matter down the soil profile in drylands[J],2023,226.
APA	Li, Xiaojuan.,Yang, Tinghui.,Hicks, Lettice C..,Hu, Bin.,Li, Fanglan.,...&Bao, Weikai.(2023).Latitudinal patterns of particulate and mineral-associated organic matter down the soil profile in drylands.SOIL & TILLAGE RESEARCH,226.
MLA	Li, Xiaojuan,et al."Latitudinal patterns of particulate and mineral-associated organic matter down the soil profile in drylands".SOIL & TILLAGE RESEARCH 226(2023).