scholarly journals The sources characteristics of stable isotope organic carbon and nitrogen in suspended particles and surface sediments in Lake Erhai and their water quality implications

2022 ◽  
Vol 34 (1) ◽  
pp. 118-133
Author(s):  
Ji Ningning ◽  
◽  
Liu Yong ◽  
Wang Shengrui
Keyword(s):  
Water Quality ◽  
Stable Isotope ◽  
Organic Carbon ◽  
Surface Sediments ◽  
Suspended Particles ◽  
Carbon And Nitrogen ◽  
Lake Erhai

scholarly journals Analysis of sedimentary organic carbon origin in Taihu lake using by carbon and nitrogen stable isotope ratio

2012 ◽  
Vol 68 (7) ◽  
pp. III_493-III_498
Author(s):  
Megumu FUJIBAYASHI ◽  
Munehiro NOMURA ◽  
Xiaoguang XU ◽  
Xianning LI ◽  
Yoshio AIKAWA ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Organic Carbon ◽  
Isotope Ratio ◽  
Taihu Lake ◽  
Stable Isotope Ratio ◽  
Nitrogen Stable Isotope ◽  
Carbon And Nitrogen ◽  
Sedimentary Organic Carbon

scholarly journals Composition Characteristics of Organic Matter and Bacterial Communities under the Alternanthera philoxeroide Invasion in Wetlands

2020 ◽  
Vol 10 (16) ◽  
pp. 5571
Author(s):  
Qingqing Cao ◽  
Haijie Zhang ◽  
Wen Ma ◽  
Renqing Wang ◽  
Jian Liu
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Constructed Wetlands ◽  
High Throughput Sequencing ◽  
Surface Sediments ◽  
Alligator Weed ◽  
Weed Invasion ◽  
Bacterial Phyla ◽  
Carbon And Nitrogen ◽  
Natural Wetlands

The influence of Alternanthera philoxeroide (alligator weed) invasion on wetland organic matter (OM) accumulation and bacterial changes is rarely studied, but is possibly an important step for revealing the invasion mechanism. Thus, the distribution characteristics of light fraction organic carbon and nitrogen (LFOC and LFON), and heavy fractions organic carbon and nitrogen (HFOC and HFON) were analyzed. Sampling was done on two sediment depths (0–15 cm and 15–25 cm) of invaded and normal habitats of two natural wetlands and two constructed wetlands, and bacterial taxa and composition in surface sediments were also analyzed by high-throughput sequencing. In the surface sediments, the LFOC and LFON contents were significantly higher in the constructed wetlands (0.791 and 0.043 g·kg−1) than in the natural wetlands (0.500 and 0.022 g·kg−1), and the contents of the C and N fractions were also prominently higher in the invaded areas than in normal wetland habitats. The OM storage was relatively stable. Proteobacteria (55.94%), Bacteroidetes (5.74%), Acidobacteria (6.66%), and Chloroflexi (4.67%) were the dominant bacterial phyla in the wetlands. The abundance of Acidobacteria, Actinobacteria, and Gemmatimonadetes were significantly higher in the invaded areas than in the normal habitats. The relative high abundance-based coverage estimator (ACE) index in the constructed wetlands and invaded areas suggested the corresponding high bacterial diversity. The significant and positive relationship between Acidobacteria and organic nitrogen concentrations suggested their potential and positive interrelationships. This study demonstrated that the alligator weed invasion could significantly change the compositions of sediment organic matterand bacteria, thus further changing the nutrition cycle and wetland microhabitat.

scholarly journals Application of organic carbon and nitrogen stable isotope and C/N ratios as source indicators of organic matter of Nova Viçosa-Caravelas estuarine complex, southern Bahia, Brazil

2014 ◽  
Vol 44 (1) ◽  
pp. 13-21 ◽  
Author(s):  
Saulo Spano ◽  
Andre Luiz Belem ◽  
Rafael Nunes Doria ◽  
Maria do Rosário Zucchi ◽  
José Roberto Bispo de Souza ◽  
...  
Keyword(s):  
Organic Matter ◽  
Stable Isotope ◽  
Organic Carbon ◽  
Nitrogen Stable Isotope ◽  
Carbon And Nitrogen ◽  
Southern Bahia
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