Historical sediment record of 137Cs, δ-HCH, and δ 13C reflects the impact of land use on soil erosion

Tang, Xiang-Yu; Zhang, Xinbao; Guan, Zhuo; Long, Yi; Tang, Qiang; Yu-Juan, Lü

doi:10.1007/s11629-013-2945-5

Cited by 7 publications

(5 citation statements)

References 34 publications

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“…29.9 Bq·kg -1 was detected at a depth of 84 cm in core A and ca. These results are consistent with the study of sedimentation rates in a pond at the outlet of the Chenjia Gully in Yanting, Sichuan Province, with a drainage area of 0.04 km 2 which had a sedimentation rate of 1.57 cm·a -1 from 1956 to 2010 (Tang et al 2014). An increase in the amount of clay-size particles in sediment profiles causes a slight increase in the 137 Cs activities.…”

Section: Depth Distribution Of 137 Cs Activity In the Sediment Profilessupporting

confidence: 90%

Interpreting sedimentation dynamics at Longxi catchment in the Three Gorges Area, China, using Cs-137 activity, particle size and rainfall erosivity

et al. 2016

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Section: Depth Distribution Of 137 Cs Activity In the Sediment Profilessupporting

confidence: 90%

Interpreting sedimentation dynamics at Longxi catchment in the Three Gorges Area, China, using Cs-137 activity, particle size and rainfall erosivity

et al. 2016

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“…The management measures can be grouped into actions that are focused on: (1) remediating soil erosion in catchment areas and (2) mitigation at the reservoir level to reduce sediment deposition. Some of the effective soil erosion mitigation practices include afforestation at the upper basin and reforestation of hill slopes with trees such as cypress (Tang et al 2014). For instance, a tenfold increase of forest land (equivalent to 55% of the total land) in a period of 45 years reduced the annual sediment yield of a Chinese basin by 48% (Zhang et al 2020).…”

Section: Effect Of Human Activities On Sedimentation Ratementioning

confidence: 99%

“…For steeply sloping land, the discontinuation of farming and conversion to forests and woodlands have reduced soil erosion, whereas for gently sloping farmland terraces, parts of the croplands have been converted to orchards (Tang et al 2014). Conservation tillage has also been effective in reducing soil erosion rates as well as the reduction in the number of farms with outdoor feedlots for hogs (Renwick et al 2005).…”

Section: Effect Of Human Activities On Sedimentation Ratementioning

confidence: 99%

A review of sedimentation rates in freshwater reservoirs: recent changes and causative factors

et al. 2023

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Sediment deposition in water reservoirs has major implications for storage capacity, reservoir lifetime, and water quality. Changes in rainfall patterns and land use will consequently alter the rate of erosion and therefore have a direct effect on sedimentation rates. This literature review employed a systematic mapping approach to collate and describe evidence of contemporary sedimentation trends for impounded reservoirs and natural lakes with emphasis on studies which analysed impacts on water storage capacity. Fourteen studies determined an overall increase in sedimentation rate, 13 identified a recent decline and another 5 reported mixed results. Interestingly, 83.3% of the articles that studied natural lakes found an increase in recent contemporary sedimentation, while 54.5% of the articles on impounded reservoirs indicated recent declines in sediment deposition. Land use change was the main causative factor responsible for sedimentation rate increase followed by the combined effects of land activities and climate change. Soil and sediment management strategies, implemented in and upstream of some impounded reservoirs, have proved to be effective in mitigating and remediating reservoir sedimentation. From the 147 papers preselected, only 33 contain sufficient sedimentation data to infer recent rate trends with only about 45% of these articles reporting quantities of storage capacity loss caused by sedimentation. Across these 33 studies, assessments of sedimentation and associated storage capacity loss are compromised by the limited spatiotemporal resolution of current measurement methods, reinforcing the requirement to develop new, more robust techniques to monitor sedimentation and storage capacity changes.

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“…The upper orchard is steeply sloped and was recently logged. Steep slopes have higher runoff and greater potential for erosion, even without the soil destabilization caused by logging (Tang et al 2014). Soils eroded from the upper orchard may be nonpoint sources of residues adsorbed to the soils from historic applications, perhaps even more so because of the soils vulnerability to erosion (Munn and Gruber 1997).…”

Section: Sources Of Ddtmentioning

confidence: 99%

Tracking Recent DDT Contamination in a Northern New England Watershed: A Geosciences Approach

May

Doner

Duncan

et al. 2021

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The p,p’ isomers of DDT, DDE, and DDD were analyzed in soils, sediments, and crayfish in the Squam Lake watershed in central New Hampshire (NH), U.S.A. Bennett Brook sources elevated levels of DDT residues to Squam Lake through sediment transport, likely due to legacy contamination from applications to an apple orchard surrounding the stream in the mid 1900s. Results reveal a point source located at a barn used during the orchard operation, which was burned down around 1967, with up to 723 µg/kg p,p’ DDT and 721 µg/kg p,p’ DDE in the soils. Higher DDT than DDE in soil samples, but not in sediment samples, suggests persistence of the contaminant in watershed soils, and faster degradation once mobilized into Bennett Brook and Squam Lake. DDT residues in the lake sediments from 1951 to the present, reveal DDT has consistently been entering Squam Lake since usage began in the U.S. There are likely multiple sources that have contributed to the constant supply, including the orchard soils treated with DDT serving as a nonpoint source, the barn site, and DDT-laden soils vulnerable to erosion, including stream banks and logged or steeply sloped land. Detections of residues in the stream and lake sediments exceed certain sediment quality guidelines for the protection of aquatic life. Higher p,p’ DDE levels in crayfish collected in the mouth of Bennett Brook versus crayfish collected in Squam Lake, distant from Bennett Brook, suggests that residues sourcing from this sub-watershed are entering the aquatic food chain at levels higher than other parts of the lake.

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Historical sediment record of 137Cs, δ-HCH, and δ 13C reflects the impact of land use on soil erosion

Cited by 7 publications

References 34 publications

Interpreting sedimentation dynamics at Longxi catchment in the Three Gorges Area, China, using Cs-137 activity, particle size and rainfall erosivity

Interpreting sedimentation dynamics at Longxi catchment in the Three Gorges Area, China, using Cs-137 activity, particle size and rainfall erosivity

A review of sedimentation rates in freshwater reservoirs: recent changes and causative factors

Tracking Recent DDT Contamination in a Northern New England Watershed: A Geosciences Approach

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