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Distribution of dissolved organic carbon in lakes of different trophic types

机译：不同营养类型湖泊中溶解有机碳的分布

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The distributions of dissolved organic carbon (DOC) in the warm season were elucidated in ten lakes of different trophic types in Japan, Russia, and China. DOC showed similar vertical distributions in all the lakes in summer when thermal stratification occurred. DOC in the epilimnion was higher than the value of 0.8 mg Cl-1 found in the hypolimnion. In three Japanese lakes, hypolimnion DOC was negatively correlated with apparent oxygen utilization (AOU), reflecting the net oxidation of DOC using the dissolved oxygen in lake water. The DOC:O-2 ratios (0.1150-0.179), calculated by the slopes of the regression lines of DOC versus AOU in hypolimnion water, were as low as those of deep-sea water, which indicates low bioavailability of lake water DOC for heterotrophic bacteria. DOC and conductivity did not correlate well except in two Japanese lakes: one showed a positive correlation and the other a negative correlation, indicating DOC loading from the inflowing rivers. Eutrophic lakes tended to have higher DOC values than meso- and oligotrophic lakes, and DOC values in the surface water negatively correlated with Secchi depths.
机译：在日本，俄罗斯和中国的十个营养类型不同的湖泊中，阐明了暖季中溶解有机碳（DOC）的分布。夏季发生热分层时，DOC在所有湖泊中显示出相似的垂直分布。上lim中的DOC高于下the中发现的0.8 mg Cl-1的值。在日本的三个湖泊中，次生水DOC与表观氧气利用率（AOU）呈负相关，反映了利用湖水中溶解氧对DOC的净氧化作用。通过斜线水中DOC与AOU的回归线的斜率计算得出的DOC：O-2比率（0.1150-0.179）与深海水一样低，这表明湖泊水DOC对于异养生物的生物利用度较低菌。除两个日本湖泊外，DOC和电导率之间的相关性不高：一个显示正相关，另一个显示负相关，表明流入河流中的DOC含量较高。富营养化湖泊的DOC值往往高于中营养和低营养湖泊，地表水中的DOC值与Secchi深度呈负相关。

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