Effect of organic carbon to nitrogen ratio in wastewater on growth, nutrient uptake and lipid accumulation of a mixotrophic microalgae Chlorella sp.

2019 ◽  
Vol 282 ◽  
pp. 118-124 ◽  
Author(s):  
Feng Gao ◽  
Hong-Li Yang ◽  
Chen Li ◽  
Yuan-Yuan Peng ◽  
Miao-Miao Lu ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Nutrient Uptake ◽  
Lipid Accumulation ◽  
Carbon To Nitrogen Ratio ◽  
Chlorella Sp ◽  
Nitrogen Ratio

scholarly journals Thresholds in aridity and soil carbon-to-nitrogen ratio govern the accumulation of soil microbial residues

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Zhiguo Hao ◽  
Yunfei Zhao ◽  
Xia Wang ◽  
Jinhong Wu ◽  
Silong Jiang ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Carbon ◽  
Aridity Index ◽  
Carbon Accumulation ◽  
Humid Climate ◽  
Carbon To Nitrogen Ratio ◽  
Fungal Abundance ◽  
Nitrogen Ratio ◽  
Microbial Residues

AbstractMicrobial moribunds after microbial biomass turnover (microbial residues) contribute to the formation and stabilization of soil carbon pools; however, the factors influencing their accumulation on a global scale remain unclear. Here, we synthesized data for 268 amino sugar concentrations (biomarkers of microbial residues) in grassland and forest ecosystems for meta-analysis. We found that soil organic carbon, soil carbon-to-nitrogen ratio, and aridity index were key factors that predicted microbial residual carbon accumulation. Threshold aridity index and soil carbon-to-nitrogen ratios were identified (~0.768 and ~9.583, respectively), above which microbial residues decreased sharply. The aridity index threshold was associated with the humid climate range. We suggest that the soil carbon-to-nitrogen ratio threshold may coincide with a sharp decrease in fungal abundance. Although dominant factors vary between ecosystem and climate zone, with soil organic carbon and aridity index being important throughout, our findings suggest that climate and soil environment may govern microbial residue accumulation.

Terrigenous Organic Matter in Sediments of the St. Lawrence Estuary and the Saguenay Fjord

1979 ◽  
Vol 36 (10) ◽  
pp. 1250-1255 ◽  
Author(s):  
R. Pocklington ◽  
J. D. Leonard
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Substantial Contribution ◽  
Lower Estuary ◽  
Lawrence Estuary ◽  
Carbon To Nitrogen Ratio ◽  
Terrigenous Organic Matter ◽  
Saguenay Fjord ◽  
Nitrogen Ratio ◽  
St Lawrence Estuary

The proportion of land-derived organic matter in sediments of the upper St. Lawrence Estuary is unexpectedly low. In the Saguenay Fjord and the lower estuary, high organic carbon to nitrogen ratios and the presence of lignin indicate a substantial contribution of organic matter from terrestrial sources. The proportion of terrigenous organic matter decreases rapidly thereafter, approaching levels typical of marine sediments in the open Gulf. Key words: Organic matter, sediments, carbon to nitrogen ratio, lignin, St. Lawrence Estuary, Saguenay Fjord

scholarly journals The Particulate Organic Carbon-to-Nitrogen Ratio Varies With Ocean Currents

2021 ◽  
Vol 9 ◽  
Author(s):  
Shengjun Xiao ◽  
Linlin Zhang ◽  
Yuhao Teng ◽  
Tao Huang ◽  
Wen Luo
Keyword(s):  
Organic Carbon ◽  
Particulate Organic Carbon ◽  
High Ratio ◽  
Ocean Currents ◽  
Particulate Carbon ◽  
Carbon And Nitrogen ◽  
Carbon To Nitrogen Ratio ◽  
East Greenland Current ◽  
High Latitude Region ◽  
Nitrogen Ratio

Ocean currents could adjust ocean carbon and nitrogen composition which are an important part of the global carbon and nitrogen cycle. We procured global concentrations of particulate carbon and nitrogen in different depths, classified them according to ocean currents (upper 300 m), and analyzed POC-to-PON ratio (particulate organic carbon-to-nitrogen ratio) variations. We found that the regions with currents have a higher ratio than those without currents in the northern hemisphere, except in 50°–60°N (median ratio without currents is 8.38). Warm currents (median ratio ranges from 5.96 to 8.44) have a higher ratio than cold currents (6.19–8.89), except for the East Greenland Current (reach to 8.44) and Labrador Current (reach to 8.89). Meanwhile, we also analyzed the effects of ocean currents’ flowing and found that the distributions of the POC-to-PON ratio vary in different current types (e.g., cause of formation and distance from the shore). Generally speaking, the POC-to-PON ratio of the eolian currents and near-ocean currents change fiercer than that of compensation currents and near-coast currents. Ocean currents also have a buffering effect in the variation between surface and deep water, which prevents the severe change of the POC-to-PON ratio. The high-value anomaly of POC-to-PON caused by the confluence of warm and cold currents was also analyzed. It can be deduced that the high ratio in the high-latitude region was mainly caused by the terrigenous organic matter (especially carbon) and low nitrogen.

scholarly journals Regional variation in the particulate organic carbon to nitrogen ratio in the surface ocean

2013 ◽  
Vol 27 (3) ◽  
pp. 723-731 ◽  
Author(s):  
A. C. Martiny ◽  
Jasper A. Vrugt ◽  
Francois W. Primeau ◽  
Michael W. Lomas
Keyword(s):  
Organic Carbon ◽  
Particulate Organic Carbon ◽  
Regional Variation ◽  
Carbon To Nitrogen Ratio ◽  
Surface Ocean ◽  
Nitrogen Ratio

scholarly journals Evaluation of Properties and Elements in the Surface of Acidic Soil in the Central Region of Thailand

2021 ◽  
Vol 44 (3) ◽  
Author(s):  
Patarapong Kroeksakul ◽  
Arin Ngamniyom ◽  
Kun Silprasit ◽  
Sakawjai Tepamongkol ◽  
Punnada Teerapanaprinya ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Ph ◽  
Soil Acidity ◽  
Acidic Soil ◽  
Carbon To Nitrogen Ratio ◽  
Nitrogen Ratio ◽  
Central Thailand

The study aimed to evaluate and correlate acidic soil components to understand the phenomena of this type of soil. The soil samples were collected from 64 locations in 3 provinces of central Thailand and were tested for soil pH, element content, soil organic matter (SOM), and soil organic carbon (SOC). The results show that soil acidity in central Thailand has an average pH of 4.71 ± 0.87. The soil acidity level ranges from very strongly acidic in Phatum Thani and Nakhon Nayok provinces to strongly acidic in Chachoengsao province. Soil bulk density is about 0.34 g/cm3, and the correlation of soil pH to lead (Pb), nickel (Ni), nitrogen (N), carbon-to-nitrogen ratio (C/N ratio), and zinc (Zn) is as follows: principle component 1 (PC1) is carbon-to-nitrogen ratio > pH > zinc (C/N ratio > pH > Zn), and principle component 2 (PC2) is soil organic carbon > bulk density > soil organic matter (SOC > BD > SOM). Soil pH, SOM, and SOC are in similar groups. The soil abundance at the study site was compared with the ideal soil for plants, and heavy metal contamination in the acidic soil of the central region did not exceed the standard limit. The study found a correlation between SOM and SOM (r = 0.715; p < 0.01), indicating soil quality and microbial activity.

Sign in / Sign up

Export Citation Format

Share Document