干旱区生态环境知识资源中心(Arid): Millennial scale erosion and sedimentation investigation in karst watersheds using dating and palynology

Arid

DOI	10.1016/j.catena.2022.106526
	Millennial scale erosion and sedimentation investigation in karst watersheds using dating and palynology
	Cao, Zihao; Ke, Qihua; Zhang, Keli; Zhang, Zhuodong; Liu, Yingna; Xiao, Shizhen; Wei, Mengyao
通讯作者	Zhang, KL
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2022
卷号	217
英文摘要	The sedimentary sequence deposited in a depression provides good opportunity for karst watershed soil loss reconstruction. Extensive sediment dating and soil loss estimation in karst areas of Southwest China have been carried out in the past few decades. Unfortunately, most studies only revealed soil loss over the last 50-100 years by using Cs-137 and/or Pb-210. This study attempts to reconstruct soil erosion in a watershed over the past millennium using sediment dating combined with palynological techniques. In this study, two karst watersheds with different degrees of rocky desertification were selected, and soil profile samples were collected from the depressions to determine pollen taxa, Cs-137 and soil organic carbon, and then, the optically stimulated luminescence (OSL) and radiocarbon were used to date the sediments in the two profiles. The results showed that erosion rate characteristics in the Liaojiawodang (LJWD, severe rocky desertification) and Dajutang (DJT, mild rocky desertification) watersheds were markedly different over the last 1000 years. On average, the erosion rates of the LJWD and DJT watersheds were 0.13 Mg ha(-1) yr(-1) and 1.28 Mg ha(-1) yr(-1), respectively. Overall, the erosion rate in the areas with severe rocky desertification was obviously small in the past millennium, and there was no serious soil loss. This result indicated that rocky desertification developed at least 1000 years ago. Pollen analysis indicated that soil erosion changes in both watersheds over the past 1000 years were well correlated with the change in crop pollen indicating human farming activities. Based on changes in the content of different types of pollen in sediments, the change in soil erosion can be linked to the change in land use and vegetation landscape. Overall, this work improves our understanding of the relationship between soil erosion and agricultural activities and vegetation landscape change in karst watersheds.
英文关键词	Soil erosion Sediment dating Pollen Agriculture Karst depression
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000855688100002
WOS关键词	OPTICALLY STIMULATED LUMINESCENCE ; ROCKY DESERTIFICATION ; VEGETATION HISTORY ; NORTHWEST GUANGXI ; SOUTHWEST CHINA ; LAND-USE ; CATCHMENT ; RATES ; SOIL ; DEPRESSION
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/2XILL650/392110
推荐引用方式 GB/T 7714	Cao, Zihao,Ke, Qihua,Zhang, Keli,et al. Millennial scale erosion and sedimentation investigation in karst watersheds using dating and palynology[J],2022,217.
APA	Cao, Zihao.,Ke, Qihua.,Zhang, Keli.,Zhang, Zhuodong.,Liu, Yingna.,...&Wei, Mengyao.(2022).Millennial scale erosion and sedimentation investigation in karst watersheds using dating and palynology.CATENA,217.
MLA	Cao, Zihao,et al."Millennial scale erosion and sedimentation investigation in karst watersheds using dating and palynology".CATENA 217(2022).