干旱区生态环境知识资源中心(Arid): Latitudinal patterns of light and heavy organic matter fractions in arid and semi-arid soils

Arid

DOI	10.1016/j.catena.2022.106293
	Latitudinal patterns of light and heavy organic matter fractions in arid and semi-arid soils
	Li, Xiaojuan; Yang, Tinghui; Hicks, Lettice C.; Hu, Bin; Liu, Xin; Wei, Dandan; Wang, Zilong; Bao, Weikai
通讯作者	Bao, WK
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2022
卷号	215
英文摘要	Semi-arid and arid ecosystems are important for the global C cycle. Despite this, it remains unclear how organic matter fractions vary across latitudinal gradients, and what drives this variation, in dry ecosystems. In this study, we sampled soils from 100 sites across a latitudinal gradient in the dry valleys of southwestern China to explore the latitudinal patterns of light fraction organic matter (LFOM) and heavy fraction organic matter (HFOM) at two soil depths (0-10 cm and 10-20 cm). Across the studied gradient, HFOM accounted for a larger fraction of soil organic matter than LFOM. LFOM increased exponentially with increasing latitude at both 0-10 cm and 10-20 cm depths. Heavy fraction organic C increased linearly with increasing latitude at both depths, while heavy fraction organic N only increased with latitude in soils from 10 to 20 cm depth. Latitudinal patterns of LFOM were mainly explained by climate, with the most important driver being mean annual temperature, followed by mean annual precipitation. Soil physicochemical factors - in particular cation exchange capacity and silt content - explained the most variation in HFOM. Total microbial biomass was also important in explaining variation in HFOM, especially in the 10-20 cm soil layer. Overall, our results shed light on the spatial distribution of organic matter fractions in arid and semi-arid regions. We also identify candidate drivers of the variation in LFOM and HFOM in arid and semi-arid regions, finding that climate primarily explains variation in LFOM while soil physiochemistry primarily explains variation in HFOM.
英文关键词	Soil organic matter Light fraction organic matter Heavy fraction organic matter Arid ecosystems Climate gradient Soil C cycling
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000798079700005
WOS关键词	CARBON STORAGE ; PLANT DIVERSITY ; LOESS PLATEAU ; LAND-USE ; STABILIZATION ; NITROGEN ; LABILE ; SEQUESTRATION ; BIOMASS ; POOLS
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/2XILL650/392100
推荐引用方式 GB/T 7714	Li, Xiaojuan,Yang, Tinghui,Hicks, Lettice C.,et al. Latitudinal patterns of light and heavy organic matter fractions in arid and semi-arid soils[J],2022,215.
APA	Li, Xiaojuan.,Yang, Tinghui.,Hicks, Lettice C..,Hu, Bin.,Liu, Xin.,...&Bao, Weikai.(2022).Latitudinal patterns of light and heavy organic matter fractions in arid and semi-arid soils.CATENA,215.
MLA	Li, Xiaojuan,et al."Latitudinal patterns of light and heavy organic matter fractions in arid and semi-arid soils".CATENA 215(2022).