Multiple sediment cores from reservoirs are needed to reconstruct recent watershed changes from stable isotopes (δ13C and δ15N) and C/N ratios: case studies from the mid-western United States

Kumar, Anupam; Hage-Hassan, J.; Baskaran, M.; Miller, Carol J.; Selegean, James P.; Creech, Calvin

doi:10.1007/s10933-016-9888-0

Cited by 16 publications

(3 citation statements)

References 35 publications

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“…Terrestrial vascular plants are composed mainly of lignin and cellulose and lack nitrogen; thus, the C/N value of terrigenous organic matter is usually 20-30 [62]. The C/N ratio of lake sediments has been widely used to distinguish the source of sedimentary organic matter [63,64]. When the C/N ratio is less than 10, the organic matter is derived from aquatic plants; when the C/N ratio is greater than 20, the organic matter is derived from terrestrial plants.…”

Section: Organic Matter Proxies and Their Reponses To Anthropogenic Imentioning

confidence: 99%

Anthropogenic Influences on Environmental Changes of Lake Bosten, the Largest Inland Freshwater Lake in China

Liu

Abuduwaili

2020

Sustainability

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A short lacustrine sediment core (41 cm) from Lake Bosten in arid central Asia was used to investigate the environmental changes that occurred in the past ≈150 years based on the superposition of climate and anthropogenic factors. Geochemical elements, total organic carbon (TOC) and nitrogen (TN), and stable isotope data (δ13Corg and δ15N) were used to identify abnormal environmental changes. The average C/N ratio in the sediments of Lake Bosten suggested that the organic matter in lake sediments was mainly from aquatic plants. The δ13Corg and δ15N in the lake sediments mainly reflect changes in the structure of the lake’s ecosystem. Before the 1960s, the primary productivity of the lake was relatively low with a relatively stable lake water environment. From the 1960s to the mid-1980s, the lake’s ecosystem was closely related to a significant decline in water levels caused by human activities and an increase in salinity. From the late 1980s to ≈2000, the aquatic plant structure of Lake Bosten did not change significantly. After 2000, the upper part of the sedimentary record suggested enhanced productivity due to urban and industrial development in the catchment area. However, sedimentary perspectives of the responses of different environmental proxies in sediments to human activities were anisochronous, and the increasing heavy metal (Pb and Cu) and P accumulations appeared in 1970, reflecting heightened human impacts. Through the comparison between the Aral Sea and Lake Bosten, it was inferred that, under the intervention of human activities, the lake experienced a completely different evolution trend. Humans, as geological agents, should protect our living environment while satisfying social development. The results will provide an important supplement to a large spatial scale study of the influences of human activities on the environment in Central Asia, which also has some significant implications for the protection of the ecological environment and the realization of sustainable development in arid regions.

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Section: Organic Matter Proxies and Their Reponses To Anthropogenic Imentioning

confidence: 99%

Anthropogenic Influences on Environmental Changes of Lake Bosten, the Largest Inland Freshwater Lake in China

Liu

Abuduwaili

2020

Sustainability

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“…To date, only a limited number of studies have compared more than one core from a single lake (Wang et al 2009;Lu et al 2014;Sarkar et al 2014;Kumar et al 2016). However, these studies strongly suggested that a single core is insufficient to represent a whole lake environment due to the spatial variability of sediment distribution.…”

Section: Spatiotemporal Changes In Sedimentation Ratementioning

confidence: 99%

Organic carbon accumulation and productivity over the past 130 years in Lake Kawaguchi (central Japan) reconstructed using organic geochemical proxies

et al. 2020

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Organic matter in lake sediments contains information that can be used to reconstruct lake environmental histories over decades or centuries. In this study, we used organic geochemical proxies (i.e., total organic carbon [TOC], TOC/total nitrogen [TN] atomic ratios [C/N], stable carbon isotope ratios of TOC [d 13 C TOC ] and palmitic acid [d 13 C C16:0 ], and nitrogen isotope ratios of bulk sediment [d 15 N bulk ]) in sediments from Lake Kawaguchi, Japan, to reconstruct detailed histories of the organic matter accumulation and lake productivity over the past 130 years. Vertical profiles of the mass accumulation rate (MAR) of TOC in the eastern lake basin (core KAW14-7A) showed parallel increases with the C/N ratio from the 1960s to the 1980s, indicating an accelerated delivery of terrestrial organic matter via anthropogenic land-use change. In contrast, the C/N ratios in the western and central basins (cores KAW14-1A and KAW14-4B, respectively) were almost constant prior to the 1980s, suggesting that the increasing trends in the TOC MAR values in these cores are most likely attributable to the onset of eutrophication associated with rapid economic growth after the mid-1950s. On the other hand, the d 15 N bulk

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“…Furthermore, several proxies have been employed to provide interpretations of ecosystem changes in response to anthropogenic impacts in reservoirs. Diatoms are a well-known proxy, sensitive to changes in productivity (Woodbridge et al 2014;Schroeder et al 2016), and geochemical markers can also be particularly valuable to trace the history of trophic changes (Filstrup et al 2010;Kumar et al 2016). A combination of both geochemical and biological proxies has been recently used with success to determine environmental change in reservoirs in North and South America (Winston et al 2014;Fontana et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Assessing the degree of ecological change and baselines for reservoirs: challenges and implications for management

Wengrat

Bennion

Ferreira³

et al. 2019

J Paleolimnol

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Tropical reservoirs are sensitive to eutrophication but long-term impacts of impoundment on their productivity and biota are poorly understood. Here, we employ a palaeolimnological approach to assess whether ecological baselines can be defined for reservoirs, and examine the challenges and management implications. We studied the environmental history of five reservoirs in Brazil with different productivities, using sediment records covering the period since reservoir construction (* 50-90 years). Our main goals, based on the analysis of organic geochemistry (TOC, TN, TP, C:N), stable isotopes Electronic supplementary material The online version of this article (

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Multiple sediment cores from reservoirs are needed to reconstruct recent watershed changes from stable isotopes (δ13C and δ15N) and C/N ratios: case studies from the mid-western United States

Cited by 16 publications

References 35 publications

Anthropogenic Influences on Environmental Changes of Lake Bosten, the Largest Inland Freshwater Lake in China

Anthropogenic Influences on Environmental Changes of Lake Bosten, the Largest Inland Freshwater Lake in China

Organic carbon accumulation and productivity over the past 130 years in Lake Kawaguchi (central Japan) reconstructed using organic geochemical proxies

Assessing the degree of ecological change and baselines for reservoirs: challenges and implications for management

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