Distribution of dissolved organic carbon in lakes of different trophic types
Distribution of dissolved organic carbon in lakes of different trophic types
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DOI：
10.1007/s10201-004-0128-3
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发表时间：
2004-12
期刊：
影响因子：
1.6
通讯作者：
Yuko Sugiyama;Aya Anegawa;T. Kumagai;Y. Harita;T. Hori;M. Sugiyama
中科院分区：
文献类型：
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作者：
Yuko Sugiyama;Aya Anegawa;T. Kumagai;Y. Harita;T. Hori;M. Sugiyama
对日本、俄罗斯和中国10个不同营养型湖泊暖季溶解有机碳（DOC）的分布进行了研究。夏季各湖泊DOC垂直分布相似，均出现热力层结。表层水体中的DOC高于下层水体中的0.8 mg Cl − 1。在日本的三个湖泊中，浅水DOC与表观氧利用率（AOU）呈负相关，反映了DOC利用湖水中溶解氧的净氧化。DOC：根据DOC与AOU的回归线斜率计算的O2比值（0.115-0.179）与深海水体的O2比值一样低，表明湖水DOC对异养细菌的生物有效性较低。DOC和电导率没有相关性，除了在日本的两个湖泊：一个呈正相关，另一个呈负相关，表明DOC负荷从流入的河流。富营养化湖泊往往有较高的DOC值比中贫营养湖泊，DOC值在地表水与Secchi深度呈负相关。
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 C l−1found 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 : O2ratios (0.115–0.179), 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.