Distribution of dissolved organic carbon in lakes of different trophic types

被引：34

作者：

Sugiyama, Y

Anegawa, A

Kumagai, T

Harita, Y

Hori, T

Sugiyama, M

机构：

[1] Himeji Inst Technol, Sch Humanities Environm Policy & Technol, Himeji, Hyogo 67122, Japan

[2] Kyoto Univ, Grad Sch Human & Environm Studies, Kyoto 606, Japan

来源：

LIMNOLOGY | 2004年 / 5卷 / 03期

关键词：

dissolved organic carbon; distribution; Lake Baikal; Lake Biwa;

D O I：

10.1007/s10201-004-0128-3

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：165 / 176

页数：12

共 38 条

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