Simultaneous measurements of organic carbon mineralization and bacterial production in oxic and anoxic lake sediments

被引:49
作者
Bastviken, D [1 ]
Olsson, M
Tranvik, L
机构
[1] Linkoping Univ, Environm Sci Programme, Dept Themat Studies, S-58183 Linkoping, Sweden
[2] Linkoping Univ, Dept Water & Environm Studies, S-58183 Linkoping, Sweden
[3] Linkoping Univ, Div Biol, Dept Phys & Measurement Technol, SE-58183 Linkoping, Sweden
[4] Uppsala Univ, Dept Limnol, SE-75236 Uppsala, Sweden
关键词
D O I
10.1007/s00248-002-1061-9
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Based on work in marine sediments it can be hypothesized that (i) overall OM mineralization depends on the enzymatic capacity and is largely independent from the energy yield, (ii) similar oxic and anoxic rates are expected for fresh OM, while oxic rates should be faster for old OM that is partially degraded or adsorbed to particles, and (iii) that the thermodynamic energy yield does not regulate mineralization, but primarily determines the energy fraction allocated to bacterial production (BP). We addressed these hypotheses by simultaneous measurements of mineralization rates (MR) and BP in sediments from a eutrophic lake, along with MR measurements in sediments of a dystrophic lake. Anoxic MR were 44 and 78% of oxic MR in the eutrophic and dystrophic lake, respectively, which was always higher than expected given the theoretical energy yields. The BP:MR ratio was 0.94 and 0.24 in the oxic and anoxic treatments, respectively, in accordance with the expected energy yields. Thus, the results support all three hypotheses above. We also critically discuss BP measurements in sediments and suggest that bacterial growth efficiency values from simultaneous MR and BP measurements can be used to evaluate the reliability of BP estimates.
引用
收藏
页码:73 / 82
页数:10
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