Accumulation of Terrestrial Dissolved Organic Matter Potentially Enhances Dissolved Methane Levels in Eutrophic Lake Taihu, China

2018 ◽  
Vol 52 (18) ◽  
pp. 10297-10306 ◽  
Author(s):  
Yongqiang Zhou ◽  
Qitao Xiao ◽  
Xiaolong Yao ◽  
Yunlin Zhang ◽  
Mi Zhang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Lake Taihu ◽  
Eutrophic Lake ◽  
Dissolved Methane

scholarly journals Contributions of autochthonous and allochthonous sources to dissolved organic matter in a large, shallow, eutrophic lake with a highly calcareous catchment

2013 ◽  
Vol 58 (4) ◽  
pp. 1259-1270 ◽  
Author(s):  
Kaire Toming ◽  
Lea Tuvikene ◽  
Sirje Vilbaste ◽  
Helen Agasild ◽  
Malle Viik ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Eutrophic Lake ◽  
Shallow Eutrophic Lake

scholarly journals Bacterial Contribution to Dissolved Organic Matter in Eutrophic Lake Kasumigaura, Japan

2013 ◽  
Vol 79 (23) ◽  
pp. 7160-7168 ◽  
Author(s):  
Nobuyuki Kawasaki ◽  
Kazuhiro Komatsu ◽  
Ayato Kohzu ◽  
Noriko Tomioka ◽  
Ryuichiro Shinohara ◽  
...  
Keyword(s):  
Amino Acids ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Bacterial Production ◽  
Eutrophic Lake ◽  
Lake Kasumigaura ◽  
Carbon Cycles ◽  
Neutral Sugars ◽  
Freshwater Environments ◽  
Bulk Carbon

ABSTRACTIncubation experiments using filtered waters from Lake Kasumigaura were conducted to examine bacterial contribution to a dissolved organic carbon (DOC) pool. Bacterial abundance, bacterial production, concentrations of DOC, total dissolved amino acids (TDAA), and total dissolved neutral sugars (TDNS) were monitored during the experiments. Bacterial production during the first few days was very high (20 to 35 μg C liter−1day−1), accounting for 40 to 70% of primary production. The total bacterial production accounted for 34 to 55% of the DOC loss during the experiment, indicating high bacterial activities in Lake Kasumigaura. The DOC degradation was only 12 to 15%, whereas the degradation of TDAA and TDNS ranged from 30 to 50%, suggesting the preferential usage of TDAA and TDNS. The contribution of bacterially derived carbon to a DOC pool in Lake Kasumigaura was estimated usingd-amino acids as bacterial biomarkers and accounted for 30 to 50% of the lake DOC. These values were much higher than those estimated for the open ocean (20 to 30%). The ratio of bacterially derived carbon to bulk carbon increased slightly with time, suggesting that the bacterially derived carbon is more resistant to microbial degradation than bulk carbon. This is the first study to estimate the bacterial contribution to a DOC pool in freshwater environments. These results indicate that bacteria play even more important roles in carbon cycles in freshwater environments than in open oceans and also suggests that recent increases in recalcitrant DOC in various lakes could be attributed to bacterially derived carbon. The potential differences in bacterial contributions to dissolved organic matter (DOM) between freshwater and marine environments are discussed.

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