scholarly journals Methanogens Harboring in Rice Rhizosphere Reduce Labile Organic Carbon Compounds to Produce Methane Gas

2018 ◽  
Author(s):  
Prabhat Pramanik ◽  
Pil Joo Kim
Keyword(s):  
Organic Carbon ◽  
Labile Organic Carbon ◽  
Methane Gas ◽  
Rice Rhizosphere ◽  
Carbon Compounds

Content and seasonal change in soil labile organic carbon under different forest covers

2009 ◽  
Vol 17 (1) ◽  
pp. 41-47 ◽  
Author(s):  
Jian ZHANG ◽  
Si-Long WANG ◽  
Qing-Kui WANG ◽  
Yan-Xin LIU
Keyword(s):  
Organic Carbon ◽  
Seasonal Change ◽  
Labile Organic Carbon ◽  
Soil Labile Organic Carbon

scholarly journals Quantification of DOC concentrations in relation with soil properties of soils in tundra and taiga of Northern European Russia

2010 ◽  
Vol 7 (3) ◽  
pp. 3189-3226 ◽  
Author(s):  
M. R. Oosterwoud ◽  
E. J. M. Temminghoff ◽  
S. E. A. T. M. van der Zee
Keyword(s):  
Organic Carbon ◽  
Climate Changes ◽  
European Russia ◽  
Mineral Solubility ◽  
Northern European ◽  
Carbon Compounds ◽  
Northern Regions ◽  
Doc Concentration ◽  
Chemical Modelling ◽  
Northern European Russia

Abstract. Potential mobilization and transport of Dissolved Organic Carbon (DOC) in subarctic river basins towards the oceans is enormous, because 23–48% of the worlds Soil Organic Carbon (SOC) is stored in northern regions. As climate changes, the amount and composition of DOC exported from these basins are expected to change. The transfer of organic carbon between soils and rivers results in fractionation of organic carbon compounds. The aim of this research is to determine the DOC concentrations, its fractions, i.e. humic (HA), fulvic (FA), and hydrophilic (HY) acids, and soil characteristics that influence the DOC sorptive properties of different soil types within a tundra and taiga catchment of Northern European Russia. DOC in taiga and tundra soil profiles (soil solution) consisted only of HY and FA, where HY became more abundant with increasing depth. Adsorption of DOC on mineral phases is the key geochemical process for release and removal of DOC from potentially soluble carbon pool. We found that adsorbed organic carbon may desorb easily and can release DOC quickly, without being dependent on mineralization and degradation. Although Extractable Organic Carbon (EOC) comprise only a small part of SOC, it is a significant buffering pool for DOC. We found that about 80–90% of released EOC was previously adsorbed. Fractionation of EOC is also influenced by the fact that predominantly HA and FA adsorbed to soil and therefore also are the main compounds released when desorbed. Flowpaths vary between taiga and tundra and through seasons, which likely affects DOC concentration found in streams. As climate changes, also flowpaths of water through soils may change, especially in tundra caused by thawing soils. Therefore, adsorptive properties of thawing soils exert a major control on DOC leaching to rivers. To better understand the process of DOC ad- and de-sorption in soils, process based soil chemical modelling, which could bring more insight in solution speciation, mineral solubility, and adsorption reactions, is appropriate.

Nitrogen recycling or nitrogen conservation in an alga-invertebrate symbiosis?

1998 ◽  
Vol 201 (16) ◽  
pp. 2445-2453 ◽  
Author(s):  
J Wang ◽  
AE Douglas
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Organic Carbon ◽  
Ammonium Assimilation ◽  
Ammonium Concentration ◽  
Nitrogen Recycling ◽  
Symbiotic Algae ◽  
Carbon Compounds ◽  
Ammonium Production ◽  
Nitrogen Conservation

When corals and allied animals are deprived of their symbiotic algae, the ammonium content in their tissues rises. This is commonly interpreted as evidence for nitrogen recycling (i.e. algal assimilation of animal waste ammonium into amino acids that are released back to the animal), but it can also be explained as nitrogen conservation by the animal (i.e. reduced net ammonium production in response to the receipt of algal photosynthetic carbon). This study discriminated between these interpretations in two ways. First, the increased ammonium concentration in the sea anemone Aiptasia pulchella, caused by darkness or depletion of the alga Symbiodinium, was partially or completely reversed by supplementing the medium with organic carbon compounds (e.g. <IMG src="/images/symbols/&agr ;.gif" WIDTH="9" HEIGHT="12" ALIGN= "BOTTOM" NATURALSIZEFLAG="3">-ketoglutarate). Second, the activity of the ammonium-assimilating enzyme glutamine synthetase and the concentration of protein amino acids in the free amino acid pool of the animal, which were depressed by darkness and algal depletion, were restored by exogenous carbon compounds. It is concluded that organic carbon, whether derived from algal photosynthate or exogenously, promotes the animal's capacity for ammonium assimilation and reduces ammonium production from amino acid degradation. These processes contribute to nitrogen conservation in the animal, but they confound the interpretation of various studies on nitrogen recycling by symbiotic algae.

scholarly journals Coastal urbanization alters carbon cycling in Tokyo Bay

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Atsushi Kubo ◽  
Jota Kanda
Keyword(s):  
Organic Carbon ◽  
Sedimentation Rate ◽  
Dissolved Inorganic Carbon ◽  
Sewage Treatment ◽  
Tokyo Bay ◽  
Net Community Production ◽  
Labile Organic Carbon ◽  
Treatment Facilities ◽  
Coastal Urbanization ◽  
Freshwater Inputs

AbstractThe carbon budget of Tokyo Bay, a highly urbanized coastal basin, was estimated using a box model that incorporated inorganic and organic carbon data over an annual cycle (2011–2012). The surface water represented net autotrophic system in which the annual net community production (NCP) was 19 × 1010 gC year−1. The annual loading of dissolved inorganic carbon and total organic carbon (TOC) from freshwater inputs was 11.2 × 1010 and 4.9 × 1010 gC year−1, respectively. The annual TOC sedimentation rate was 3.1 × 1010 gC year−1, similar to the annual air–sea CO2 uptake (5.0 × 1010 gC year−1). Although the NCP and TOC loading from freshwater inputs were respectively 3.0 and 2.7 times lower than those in the 1970s, the TOC sedimentation rate was similar. Therefore, a relatively high carbon efflux from Tokyo Bay likely occurred in the 1970s, including CO2 efflux to the atmosphere and/or export of labile organic carbon to the open ocean. The changes in carbon flow between the 1970s and 2011–2012 resulted from improved water quality due to increased sewage treatment facilities and improved sewage treatment efficiency in the catchment, which decreased the amount of labile organic carbon flowing into the bay.

Soil microbial community responses to labile organic carbon fractions in relation to soil type and land use along a climate gradient

2020 ◽  
Vol 141 ◽  
pp. 107692 ◽  
Author(s):  
Paulina B. Ramírez ◽  
Sebastián Fuentes-Alburquenque ◽  
Beatriz Díez ◽  
Ignacio Vargas ◽  
Carlos A. Bonilla
Keyword(s):  
Land Use ◽  
Microbial Community ◽  
Organic Carbon ◽  
Soil Type ◽  
Soil Microbial Community ◽  
Community Responses ◽  
Carbon Fractions ◽  
Labile Organic Carbon ◽  
Soil Microbial ◽  
Organic Carbon Fractions

Recovery of energy from sludge – comparison of the various options

2004 ◽  
Vol 50 (9) ◽  
pp. 213-221 ◽  
Author(s):  
W.H. Rulkens ◽  
J.D. Bien
Keyword(s):  
Energy Source ◽  
Low Temperature ◽  
Organic Carbon ◽  
Treatment Options ◽  
Sludge Treatment ◽  
Innovative Treatment ◽  
Future Developments ◽  
Treatment Processes ◽  
Carbon Compounds

This paper gives a general discussion of existing sludge treatment processes and of innovative treatment options, especially focused on the valuable use of organic carbon compounds as an energy source. Attention is paid both to high and to low temperature processes and to combinations of these processes. Based on an assessment and comparison the most beneficial and sustainable options are identified and a rough indication is given of the possibilities for improvement and future developments.

Sign in / Sign up

Export Citation Format

Share Document