Processing of humic-rich riverine dissolved organic matter by estuarine bacteria: effects of predegradation and inorganic nutrients

被引:58
作者
Asmala, E. [1 ,2 ]
Autio, R. [1 ]
Kaartokallio, H. [1 ]
Stedmon, C. A. [3 ]
Thomas, D. N. [1 ,4 ]
机构
[1] Finnish Environm Inst SYKE, Ctr Marine Res, Helsinki, Finland
[2] Aarhus Univ, Dept Biosci, Roskilde, Denmark
[3] Tech Univ Denmark, Sect Oceanog & Climate, Natl Inst Aquat Resources, Charlottenlund, Denmark
[4] Bangor Univ, Sch Ocean Sci, Menai Bridge, Anglesey, Wales
基金
芬兰科学院;
关键词
DOM; Bacterial growth efficiency; Predegradation; Carbon cycling; CDOM; Fluorescent DOM; NUCLEIC-ACID CONTENT; GROWTH EFFICIENCY; MARINE-BACTERIA; BACTERIOPLANKTON GROWTH; THYMIDINE INCORPORATION; CHEMICAL-COMPOSITION; FLOW-CYTOMETRY; CARBON; WATER; FLUORESCENCE;
D O I
10.1007/s00027-014-0346-7
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The bioavailability of predegraded dissolved organic matter (DOM) from a humic-rich, boreal river to estuarine bacteria from the Baltic Sea was studied in 39-day bioassays. The river waters had been exposed to various degrees of bacterial degradation by storing them between 0 and 465 days in dark prior to the bioassay. The resulting predegraded DOM was inoculated with estuarine bacteria and the subsequent changes in DOM quantity and quality measured. During the incubations, dissolved organic carbon (DOC) and oxygen concentrations decreased, indicating heterotrophic activity. Coloured DOM was degraded less than DOC, indicating a selective utilization of DOM, and humic-like fluorescence components increased during the incubations. The amount of DOC degraded was not affected by the length of DOM predegradation. The percentage of bioavailable DOC (%BDOC) was higher in experiment units with added inorganic nitrogen and phosphorus than without addition (on average 13.5 % and 9.0, respectively), but had no effect on the degradation of fresh, non-predegraded, DOC (%BDOC 12.0 %). Bacterial growth efficiency (BGE) was highest (65 +/- A 2 %) in the units with fresh DOM, and lowest in units with predegraded DOM and no added inorganic nutrients (11 +/- A 4 %). The addition of inorganic nutrients increased the BGE of predegraded DOM units by an average of 28 +/- A 4 %. There was no significant effect on BGE by length of predegradation after the initial drop (< 3 months). This study suggests that both the length of predegradation and the inorganic nutrient status in the receiving estuary has consequences to carbon cycling and will determine the amount of terrestrial-derived DOC being ultimately assimilated into marine food webs.
引用
收藏
页码:451 / 463
页数:13
相关论文
共 80 条
[1]   Role of lakes for organic carbon cycling in the boreal zone [J].
Algesten, G ;
Sobek, S ;
Bergström, AK ;
Ågren, A ;
Tranvik, LJ ;
Jansson, M .
GLOBAL CHANGE BIOLOGY, 2004, 10 (01) :141-147
[2]   Organic carbon budget for the Gulf of Bothnia [J].
Algesten, Grete ;
Brydsten, Lars ;
Jonsson, Per ;
Kortelainen, Pirkko ;
Lofgren, Stefan ;
Rahm, Lars ;
Raike, Antti ;
Sobek, Sebastian ;
Tranvik, Lars ;
Wikner, Johan ;
Jansson, Mats .
JOURNAL OF MARINE SYSTEMS, 2006, 63 (3-4) :155-161
[3]   Photochemical and microbial consumption of dissolved organic carbon and dissolved oxygen in the Amazon River system [J].
Amon, RMW ;
Benner, R .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1996, 60 (10) :1783-1792
[4]   Linkages among the bioreactivity, chemical composition, and diagenetic state of marine dissolved organic matter [J].
Amon, RMW ;
Fitznar, HP ;
Benner, R .
LIMNOLOGY AND OCEANOGRAPHY, 2001, 46 (02) :287-297
[5]   Bioavailability of riverine dissolved organic matter in three Baltic Sea estuaries and the effect of catchment land use [J].
Asmala, E. ;
Autio, R. ;
Kaartokallio, H. ;
Pitkanen, L. ;
Stedmon, C. A. ;
Thomas, D. N. .
BIOGEOSCIENCES, 2013, 10 (11) :6969-6986
[6]   Riverine coupling of biogeochemical cycles between land, oceans, and atmosphere [J].
Aufdenkampe, Anthony K. ;
Mayorga, Emilio ;
Raymond, Peter A. ;
Melack, John M. ;
Doney, Scott C. ;
Alin, Simone R. ;
Aalto, Rolf E. ;
Yoo, Kyungsoo .
FRONTIERS IN ECOLOGY AND THE ENVIRONMENT, 2011, 9 (01) :53-60
[7]  
Battin TJ, 2008, NAT GEOSCI, V1, P95, DOI 10.1038/ngeo101
[8]   Nutrient Constraints on Metabolism Affect the Temperature Regulation of Aquatic Bacterial Growth Efficiency [J].
Berggren, Martin ;
Laudon, Hjalmar ;
Jonsson, Anders ;
Jansson, Mats .
MICROBIAL ECOLOGY, 2010, 60 (04) :894-902
[9]   Aging of allochthonous organic carbon regulates bacterial production in unproductive boreal lakes [J].
Berggren, Martin ;
Laudon, Hjalmar ;
Jansson, Mats .
LIMNOLOGY AND OCEANOGRAPHY, 2009, 54 (04) :1333-1342
[10]   The role of terrestrially derived organic carbon in the coastal ocean: A changing paradigm and the priming effect [J].
Bianchi, Thomas S. .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2011, 108 (49) :19473-19481