Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.agee.2020.106881 |
Identifying and estimating soil erosion and sedimentation in small karst watersheds using a composite fingerprint technique | |
Cao, Zihao1; Zhang, Zhuodong1; Zhang, Keli1; Wei, Xin1; Xiao, Shizhen2; Yang, Zhicheng1 | |
通讯作者 | Zhang, Keli |
来源期刊 | AGRICULTURE ECOSYSTEMS & ENVIRONMENT |
ISSN | 0167-8809 |
EISSN | 1873-2305 |
出版年 | 2020 |
卷号 | 294 |
英文摘要 | The highly heterogeneous surface environment and subsurface conduit network in karst areas make estimating soil erosion extremely complicated. Sediment fingerprint techniques have been successfully applied in soil erosion research in karst areas as a new way to more effectively collect information on soil loss. However, few sediment fingerprint factors, most of which are based on radioactive fallout tracers, such as Cs-137 and/or Pb-210, have been used in existing studies. The soil loss rate estimated by these fingerprint factors varies greatly among different watersheds. To clearly identify the sedimentary sequence, to estimate the changes in soil erosion in recent years, and to relate the soil erosion process to rocky desertification, a composite sediment fingerprint technique is used in this study. Two typical watersheds with peak clusters and depressions and with different degrees of rock desertification were selected, and sediment cores were extracted from the depressions to measure changes in Cs-137, magnetic susceptibility, soil organic carbon (SOC) and sediment particle composition at different depths. The results indicated that the soil loss rates in the Liaojiawodang (LJWD) and Dajutang (DJT) watersheds showed a fluctuating decrease from 1954 to July 2018. The severe soil erosion in the periods of 1954-1963, 1963-1970 and 1976-1986 was mainly caused by large-scale reclamation and deforestation. In addition, heavy rainfall in 1983 and 1991 might have played a significant role in the soil loss in the DJT watershed in 1978-1986 and in the LJWD watershed in 1986-2000, respectively. The construction of agricultural terraces several decades ago and the implementation of the Closing Mountains for Forest Cultivation, Grain for Green and Poverty Alleviation projects in recent years to improve the ecological environment have effectively alleviated the soil erosion in the studied watersheds. Over the past 60 years, soil loss in the LJWD and DJT watersheds decreased by approximately 89 % and 87 %, respectively. In karst areas, rocky desertification and soil erosion do not exhibit identical trends. Because of severe rocky desertification, the soil erosion in the LJWD watershed was significantly less than that in the DJT watershed. This study provides important information on detailed sediment dating and demonstrates the potential of using Cs-137, magnetic susceptibility, SOC and sediment particle composition to identify changes in erosion in a watershed. |
英文关键词 | Soil erosion Composite fingerprint technique (CS)-C-137 Magnetic susceptibility Karst watershed |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
收录类别 | SCI-E |
WOS记录号 | WOS:000527591200014 |
WOS关键词 | RAINFALL EROSIVITY ; MAGNETIC-SUSCEPTIBILITY ; SOURCE IDENTIFICATION ; SOUTHWEST CHINA ; FALLOUT CS-137 ; DEPRESSION ; RATES ; CESIUM-137 ; DEPOSITION ; CATCHMENT |
WOS类目 | Agriculture, Multidisciplinary ; Ecology ; Environmental Sciences |
WOS研究方向 | Agriculture ; Environmental Sciences & Ecology |
来源机构 | 北京师范大学 |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/319279 |
作者单位 | 1.Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resources Ecol, Beijing 100875, Peoples R China; 2.Guizhou Normal Univ, Sch Karst Sci, Guiyang 550001, Peoples R China |
推荐引用方式 GB/T 7714 | Cao, Zihao,Zhang, Zhuodong,Zhang, Keli,et al. Identifying and estimating soil erosion and sedimentation in small karst watersheds using a composite fingerprint technique[J]. 北京师范大学,2020,294. |
APA | Cao, Zihao,Zhang, Zhuodong,Zhang, Keli,Wei, Xin,Xiao, Shizhen,&Yang, Zhicheng.(2020).Identifying and estimating soil erosion and sedimentation in small karst watersheds using a composite fingerprint technique.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,294. |
MLA | Cao, Zihao,et al."Identifying and estimating soil erosion and sedimentation in small karst watersheds using a composite fingerprint technique".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 294(2020). |
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