Disturbance mechanisms of lacustrine organic carbon burial: Case study of Cuopu Lake, Southwest China

Jiang, Quanliang; Li, Shuaidong; Chen, Zhili; Huang, Changchun; Wu, Wenxin; Wan, Hongbin; Hu, Zhujun; Han, Cheng; Zhang, Zhigang; Huang, Tao

doi:10.1016/j.scitotenv.2020.140615

Cited by 16 publications

(5 citation statements)

References 53 publications

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“…Previous studies have noted the predominance of Cyanobacteria in surface sediment, which may be related to cyanobacterial blooms ( Latour et al, 2007 ; Liu et al, 2010 ). Lake CP was oligotrophic before the 1880s, but its nutrient conditions improved over time, which may have contributed to the increased growth of algae ( Jiang et al, 2020 ). Cyanobacteria can also adapt to the cold, dark, and anoxic deep sediment, possibly due to its cold-shock DEAD-box protein A, which has been shown to play a role in cyanobacterial adaptation to low temperatures ( Chamot et al, 1999 ; Redder et al, 2015 ).…”

Section: Discussionmentioning

confidence: 99%

“…Mugecuo Lake (MGC, 101.8414 E–101.8708 E, 30.1626 N–30.1483 N) and Cuopu Lake (CP, 99.3344E–99.6458E, 30.3731 N–30.6353 N) are freshwater lakes located on the eastern Tibetan plateau ( Supplementary Figure S1 ). MGC and CP have altitudes of 3,793 and 4,230 m, water area of 4 km 2 and 0.9 m 2 , and maximum water depth of 70 and 15 m, respectively, ( Ma et al, 2019 ; Jiang et al, 2020 ). In October 2017, lake sediment cores from MGC lake (30.1492 N, 101.8531E) and CP lake (30.4917 N, 99.5442E) were sampled using a Gravity sampler.…”

Section: Methodsmentioning

confidence: 99%

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Vertical variations in microbial diversity, composition, and interactions in freshwater lake sediments on the Tibetan plateau

Zhu

Deng²,

Huang³

et al. 2023

Front. Microbiol.

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Microbial communities in freshwater lake sediments exhibit a distinct depth-dependent variability. Further exploration is required to understand their biodiversity pattern and microbial interactions in vertical sediments. In this study, sediment cores from two freshwater lakes, Mugecuo (MGC) and Cuopu (CP), on the Tibetan plateau were sampled and subsequently sliced into layers at a depth of every centimeter or half a centimeter. Amplicon sequencing was used to analyze the composition, diversity, and interaction of microbial communities. Results showed that sediment samples of both lakes could be clustered into two groups at a sediment depth of about 20 cm, with obvious shifts in microbial community compositions. In lake MGC, the richness component dominated β-diversity and increased with depth, indicating that the microbial communities in the deep layer of MGC was selected from the surface layer. Conversely, the replacement component dominated β-diversity in CP, implying a high turnover rate in the surface layer and inactive seed banks with a high variety in the deep layer. A co-occurrence network analysis showed that negative microbial interactions were prevalent in the surface layers with high nutrient concentrations, while positive microbial interactions were more common in the deep layers with low nutrient concentrations, suggesting that microbial interactions are influenced by nutrient conditions in the vertical sediments. Additionally, the results highlight the significant contributions of abundant and rare taxa to microbial interactions and vertical fluctuations of β-diversity, respectively. Overall, this work deepens our understanding of patterns of microbial interactions and vertical fluctuation in β-diversity in lake sediment columns, particularly in freshwater lake sediments from the Tibetan plateau.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Vertical variations in microbial diversity, composition, and interactions in freshwater lake sediments on the Tibetan plateau

Zhu

Deng²,

Huang³

et al. 2023

Front. Microbiol.

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“…In addition, most previous studies have found that the hydrological characteristics, including trophic state, climate, and vegetation, in lake watersheds affect organic matter accumulation in sediment (Downing et Heathcote et al (2015) revealed that climate change could signi cantly increase organic carbon accumulation in northern lakes. However, most previous research has focused on boreal lakes, while some have focused on temperate-zone lakes to determine the burial e ciency and in uencing factors of organic matter burial over different time scales (Anderson et al, 2013;Anderson et al, 2014;Heathcote et al, 2015;Fortino et al, 2016;Jiang et al, 2020). Since 1970, Dianchi Lake, which is the largest sub-tropic plateau lake in Southwest China, has not only been affected by a variety of climatic features (such as monsoons, high-altitude, and low-latitude climates) but also by eutrophication and intensive human activities (such as deforestation, urbanization, and fertilization) (Gao et al, 2015;Huang et al, 2017b;Chen et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Synergistic impacts of climate change and human activities on spatiotemporal organic nitrogen burial variation in a plateau lake in southwest China

et al. 2023

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The concentration and sources of organic nitrogen (ON) in lake sediment signi cantly affect the lake nitrogen cycle. However, the in uencing factors and contributors to the ON accumulation rate (ON AR ) are unclear. In this study, tree sediment cores from northern, eastern, and southern Dianchi Lake (DC-N, DC-E, and DC-S, respectively), sampled in July 2014, were used to study the effects of autochthonous and allochthonous sources on ON. The results showed that ON and the ON AR increased 2. 4-5.1 and 2.6-4.8 times, respectively, from1900 to2000, especially since the 1980s, at which point algal blooms occurred more frequently. The ON contents decreased in the order: DC-S > DC-N > DC-E, whereas the ON AR values followed the order: DC-N > DC-S > DC-E, suggesting that the ON AR was in uenced by ON content as well as depositional environmental conditions. The total concentrations of n-alkanes (n-C 12 to n-C 34 ) ranged from 4719.4 ng g − 1 to 61,959.6 ng g − 1 in the three sediment cores, each of which exhibited different n-alkanes characteristic variation with vertical depth. The sources of ON were mainly allochthonous (soil erosion and terrestrial plants) and autochthonous (algal and aquatic plants) in DC-S and DC-N, respectively, whereas they were primarily mixed planktonic and terrestrial sources in DC-E. Using the stochastic impacts by regression on population, a uence, and technology model to further examine the ON AR values revealed that 1% increase in temperature and nitrogen fertilizer can increase the ON AR by 73.8-86.2% and 73.2-151.3% in all sediments, especially in DC-S and DC-E. However, a 1% increase in construction area could reduce the ON AR by 2.4-14.2%, especially in DC-N. Overall, climate change and human activities determine the spatial and temporal ON AR variation in Dianchi Lake.

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“…Lakes and reservoirs are important regional carbon accumulation and transfer stations in terrestrial ecosystems and have attracted greater attention [6,19,21]. The most special of these are the karst reservoirs, which are generally rich in dissolved inorganic carbon (DIC) and have a longer retention time.…”

Section: Introductionmentioning

confidence: 99%

Source, Distribution and Transformation of Organic Matter in a Subtropical Karst Reservoir

Li,

Zhang,

et al. 2023

Water

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In order to improve the understanding of the global carbon cycle and the stability of karst carbon sinks, it is necessary to better understand the source, distribution and transformation characteristics of organic matter (OM) in aquatic ecosystems. Here, stable isotope ratios (δ13C and δ15N), elemental analysis (C/N ratios), and lipid biomarkers were analyzed for dissolved organic matter (DOM) (<0.7 μm), particulate organic matter (POM) (>0.7 μm) of water, and organic matter from sediment cores (SCOM) to identify the sources, distribution, and transformation of OM in a subtropical karst reservoir. The results showed that short-chain (C14–20) n-alkyl lipids were more abundant than long-chain (C21–34) n-alkyl lipids in both the DOM and SCOM samples, indicating that bacteria were the primary sources of these lipids, while terrestrial organic matter (OM) made only a minor contribution to the n-alkyl lipid pool, and aquatic plants (macrophytes) OM contributed major contribution to the n-alkyl lipid pool in POM. Microbial activity and lipid degradation were more pronounced in the DOM. Furthermore, terrigenous and macrophyte-derived lipids were found to be more abundant in POM than in DOM and SCOM, suggesting that they are relatively resistant to degradation compared with phytoplankton-derived OM.

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Disturbance mechanisms of lacustrine organic carbon burial: Case study of Cuopu Lake, Southwest China

Cited by 16 publications

References 53 publications

Vertical variations in microbial diversity, composition, and interactions in freshwater lake sediments on the Tibetan plateau

Vertical variations in microbial diversity, composition, and interactions in freshwater lake sediments on the Tibetan plateau

Synergistic impacts of climate change and human activities on spatiotemporal organic nitrogen burial variation in a plateau lake in southwest China

Source, Distribution and Transformation of Organic Matter in a Subtropical Karst Reservoir

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