干旱区生态环境知识资源中心(Arid): Linking soil redistribution to soil organic carbon using Pb-210(ex) along different complex toposequences in a karst region, southwest China

Arid

DOI	10.1016/j.catena.2021.105239
	Linking soil redistribution to soil organic carbon using Pb-210(ex) along different complex toposequences in a karst region, southwest China
	Lan, Gaoyong; Liu, Chun; Wang, Hua; Cao, Jianhua; Tang, Wei; Li, Qiang; Hu, Bill X.
通讯作者	Liu, C ; Li, Q (corresponding author), Jinan Univ, Inst Groundwater & Earth Sci, Guangzhou 510632, Guangdong, Peoples R China.
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2021
卷号	202
英文摘要	Understanding the magnitudes and patterns of soil and associated soil organic carbon (SOC) redistribution is of great importance for assessing both soil degradation and rocky desertification in fragile karst ecosystems. However, to date reliable information on the application of excess lead-210 (Pb-210(ex)) for quantifying dynamics of SOC-soil redistribution relationship is limited on the hillslopes due to the highly heterogeneous landscape after land use change in karst systems. In this study, three typical toposequences (grassland, forests, and agroforestry) were selected in a typical karst graben basin of southwestern China. A total of 229 soil samples were collected along the toposequences to explore the soil redistribution process using a model coupled with measured Pb-210(ex), and then to ascertain the relationship of discharged Pb-210(ex) to erosion-induced SOC. The results showed that most soil samples were significantly affected by soil erosion (reference value of Pb-210(ex): 5986 +/- 756 Bq m(-2)). The output of the model demonstrated that the highest estimated net soil flux occurred in agroforestry (21.38 Mg ha(-1) yr(-1)), followed by forests (8.39 Mg ha(-1) yr(-1)) and grassland (3.54 Mg ha(-1) yr(-1)). Meanwhile, the SOC concentration showed a decreasing order of agroforestry > forest > grassland on the hillslopes, implying that while agroforestry help increase SOC sequestration potential, intensive human intervention also carries a high risk of soil erosion in karst regions. The fitting correlation of Pb-210(ex) and SOC in surface soils displayed the decreasing order of grassland (R-2 = 0.80) > forests (R-2 = 0.69) > agroforestry (R-2 = 0.42), indicating that fallout Pb-210(ex) could be used directly as a tracer to quantify the dynamics of the SOC-soil redistribution relationship in grassland toposequence. Our results provide practical evidence of the potential of Pb-210(ex) for quantifying SOC-soil redistribution along hillslopes with complex toposequences in a karst region.
英文关键词	Soil erosion Soil organic carbon Soil redistribution Land use type Karst
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000643594100015
WOS关键词	CATCHMENT SEDIMENT BUDGETS ; EROSION RATES ; LAND-USE ; AGRICULTURAL ABANDONMENT ; CS-137 MEASUREMENTS ; FALLOUT PB-210 ; NITROGEN ; SLOPES ; DEPRESSION ; TRANSPORT
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/2XILL650/349804
作者单位	[Lan, Gaoyong; Wang, Hua; Cao, Jianhua; Tang, Wei; Li, Qiang] Chinese Acad Geol Sci, Inst Karst Geol, Key Lab Karst Dynam, MNR, Guilin 541004, Peoples R China; [Lan, Gaoyong; Wang, Hua; Cao, Jianhua; Tang, Wei; Li, Qiang] Chinese Acad Geol Sci, Inst Karst Geol, GZAR, Guilin 541004, Peoples R China; [Liu, Chun; Hu, Bill X.] Jinan Univ, Inst Groundwater & Earth Sci, Guangzhou 510632, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Lan, Gaoyong,Liu, Chun,Wang, Hua,et al. Linking soil redistribution to soil organic carbon using Pb-210(ex) along different complex toposequences in a karst region, southwest China[J],2021,202.
APA	Lan, Gaoyong.,Liu, Chun.,Wang, Hua.,Cao, Jianhua.,Tang, Wei.,...&Hu, Bill X..(2021).Linking soil redistribution to soil organic carbon using Pb-210(ex) along different complex toposequences in a karst region, southwest China.CATENA,202.
MLA	Lan, Gaoyong,et al."Linking soil redistribution to soil organic carbon using Pb-210(ex) along different complex toposequences in a karst region, southwest China".CATENA 202(2021).