Microbiological turnover of amino acids immobilized from groundwater discharged through hyporrheic sediments

被引:27
作者
Fiebig, DM [1 ]
机构
[1] Max Planck Inst Limnol, Limnol Flussstn, D-36105 Schlitz, Germany
关键词
D O I
10.4319/lo.1997.42.4.0763
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
A pulse of C-14-labeled dissolved free amino acids (DFAA) was immobilized rapidly from groundwater discharged through cores of hyporheic sediment from an upland stream. Mean turnover distance within the cores was <1.5 cm but, once immobilized, DFAA carbon was retained for longer than would be expected if bacterial cycling was the only retention mechanism. It took 28 weeks for 88% of the original 1.2 mu g of DFAA carbon that had been immobilized to be respired and exported from the cores, whereas bacterial respiration alone should have mineralized >99% of this carbon within 7.4-11.4 weeks, depending on the bacterial growth efficiency assumed. Abiotic retention processes associated with organic and mineral surfaces appear to enhance the initial immobilization of DFAA and contribute to a delayed recycling of DFAA carbon within the sediment, increasing the effective availability of this labile organic carbon in the hyporheic zone. Abiotic retention of dissolved organic carbon might help sustain the high levels of bacterial production found in hyporheic sediments while reducing the demand for organic carbon imported into the hyporheic zone.
引用
收藏
页码:763 / 768
页数:6
相关论文
共 39 条
[1]  
ARMSTRONG SM, 1989, ARCH HYDROBIOL, V115, P391
[2]  
ARMSTRONG SM, 1989, FRESHWATER BIOL, V22, P153
[3]   MEIOFAUNAL GRAZING OF BACTERIA AND ALGAE IN A PIEDMONT STREAM [J].
BORCHARDT, MA ;
BOTT, TL .
JOURNAL OF THE NORTH AMERICAN BENTHOLOGICAL SOCIETY, 1995, 14 (02) :278-298
[4]   INCORPORATION OF VIRUSES INTO THE BUDGET OF MICROBIAL C-TRANSFER - A 1ST APPROACH [J].
BRATBAK, G ;
HELDAL, M ;
THINGSTAD, TF ;
RIEMANN, B ;
HASLUND, OH .
MARINE ECOLOGY PROGRESS SERIES, 1992, 83 (2-3) :273-280
[5]  
Cole Jonathan J., 1993, P101
[6]  
COX EJ, 1990, ARCH HYDROBIOL, P525
[7]   SPRING AND FALL MICROHETEROTROPHIC UTILIZATION OF DISSOLVED FREE AMINO-ACIDS IN A CALIFORNIA BORDERLAND BASIN [J].
CRAVEN, DB ;
CARLUCCI, AF .
MARINE ECOLOGY PROGRESS SERIES, 1989, 51 (03) :229-235
[8]   UTILIZATION OF DISSOLVED FREE AMINO-ACIDS BY ESTUARINE MICROORGANISMS [J].
CRAWFORD, CC ;
HOBBIE, JE ;
WEBB, KL .
ECOLOGY, 1974, 55 (03) :551-563
[9]   PATHWAYS AND MECHANISMS FOR REMOVAL OF DISSOLVED ORGANIC-CARBON FROM LEAF LEACHATE IN STREAMS [J].
DAHM, CN .
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES, 1981, 38 (01) :68-76
[10]  
DAWSON R, 1978, OCEANOL ACTA, V1, P45