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Effect of light on N-2 fixation and net nitrogen release of Trichodesmium in a field study
Lu, Yangyang1,2; Wen, Zuozhu1,3; Shi, Dalin1,3; Chen, Mingming1,2; Zhang, Yao1,2; Bonnet, Sophie4; Li, Yuhang5; Tian, Jiwei6; Kao, Shuh-Ji1,2
Source PublicationBIOGEOSCIENCES
AbstractDinitrogen fixation (NF) by marine cyanobacteria is an important pathway to replenish the oceanic bioavailable nitrogen inventory. Light is the key to modulating NF; however, field studies investigating the light response curve (NF-I curve) of NF rate and the effect of light on diazotrophderived nitrogen (DDN) net release are relatively sparse in the literature, hampering prediction using models. A dissolution method was applied using uncontaminated N-15(2) gas to examine how the light changes may influence the NF intensity and DDN net release in the oligotrophic ocean. Experiments were conducted at stations with diazotrophs dominated by filamentous cyanobacterium Trichodesmium spp. in the western Pacific and the South China Sea. The effect of light on carbon fixation (CF) was measured in parallel using the C-13 tracer method specifically for a station characterized by Trichodesmium bloom. Both NF-I and CF-I curves showed a I-k (light saturation coefficient) range of 193 to 315 mu Em(-2) s(-1), with light saturation at around 400 mu Em(-2) s(-1). The proportion of DDN net release ranged from similar to 6 to similar to 50 %, suggesting an increasing trend as the light intensity decreased. At the Trichodesmium bloom station, we found that the CF/NF ratio was light-dependent and the ratio started to increase as light was lower than the carbon compensation point of 200 mu Em(-2) s(-1). Under low-light stress, Trichodesmium physiologically preferred to allocate more energy for CF to alleviate the intensive carbon consumption by respiration; thus, there is a metabolism tradeoff between CF and NF pathways. Results showed that shortterm (< 24 h) light change modulates the physiological state, which subsequently determined the C/N metabolism and DDN net release by Trichodesmium. Reallocation of energy associated with the variation in light intensity would be helpful for prediction of the global biogeochemical cycle of N by models involving Trichodesmium blooms.
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WOS IDWOS:000419090900001
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen, Peoples R China
2.Xiamen Univ, Coll Ocean & Earth Sci, Xiamen, Peoples R China
3.Xiamen Univ, Coll Environm & Ecol, Xiamen, Peoples R China
4.Univ Toulon & Var, Aix Marseille Univ, IRD, CNRS,INSU,MIO, Marseille, New Caledonia, France
5.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
6.Ocean Univ China, Phys Oceanog Lab, Qingdao, Peoples R China
Recommended Citation
GB/T 7714
Lu, Yangyang,Wen, Zuozhu,Shi, Dalin,et al. Effect of light on N-2 fixation and net nitrogen release of Trichodesmium in a field study[J]. BIOGEOSCIENCES,2018,15(1):1-12.
APA Lu, Yangyang.,Wen, Zuozhu.,Shi, Dalin.,Chen, Mingming.,Zhang, Yao.,...&Kao, Shuh-Ji.(2018).Effect of light on N-2 fixation and net nitrogen release of Trichodesmium in a field study.BIOGEOSCIENCES,15(1),1-12.
MLA Lu, Yangyang,et al."Effect of light on N-2 fixation and net nitrogen release of Trichodesmium in a field study".BIOGEOSCIENCES 15.1(2018):1-12.
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