The occurrence of vanadium in nature: its biogeochemical cycling and relationship with organic matter—a case study of the Early Cambrian black rocks of the Niutitang Formation, western Hunan, China

2021 ◽  
Author(s):  
Rizwan Sarwar Awan ◽  
Chenglin Liu ◽  
Shangfeng Yang ◽  
Yuping Wu ◽  
Qibiao Zang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Biogeochemical Cycling ◽  
Early Cambrian ◽  
Western Hunan ◽  
Niutitang Formation

scholarly journals SHIMMER (1.0): a novel mathematical model for microbial and biogeochemical dynamics in glacier forefield ecosystems

2015 ◽  
Vol 8 (10) ◽  
pp. 3441-3470 ◽  
Author(s):  
J. A. Bradley ◽  
A. M. Anesio ◽  
J. S. Singarayer ◽  
M. R. Heath ◽  
S. Arndt
Keyword(s):  
Organic Matter ◽  
Microbial Biomass ◽  
Microbial Growth ◽  
Model Development ◽  
Biogeochemical Cycling ◽  
Biogeochemical Model ◽  
Model Parameters ◽  
Glacier Forefield ◽  
Unconstrained Model

Abstract. SHIMMER (Soil biogeocHemIcal Model for Microbial Ecosystem Response) is a new numerical modelling framework designed to simulate microbial dynamics and biogeochemical cycling during initial ecosystem development in glacier forefield soils. However, it is also transferable to other extreme ecosystem types (such as desert soils or the surface of glaciers). The rationale for model development arises from decades of empirical observations in glacier forefields, and enables a quantitative and process focussed approach. Here, we provide a detailed description of SHIMMER, test its performance in two case study forefields: the Damma Glacier (Switzerland) and the Athabasca Glacier (Canada) and analyse sensitivity to identify the most sensitive and unconstrained model parameters. Results show that the accumulation of microbial biomass is highly dependent on variation in microbial growth and death rate constants, Q10 values, the active fraction of microbial biomass and the reactivity of organic matter. The model correctly predicts the rapid accumulation of microbial biomass observed during the initial stages of succession in the forefields of both the case study systems. Primary production is responsible for the initial build-up of labile substrate that subsequently supports heterotrophic growth. However, allochthonous contributions of organic matter, and nitrogen fixation, are important in sustaining this productivity. The development and application of SHIMMER also highlights aspects of these systems that require further empirical research: quantifying nutrient budgets and biogeochemical rates, exploring seasonality and microbial growth and cell death. This will lead to increased understanding of how glacier forefields contribute to global biogeochemical cycling and climate under future ice retreat.

Paleo-sedimentary environment in relation to enrichment of organic matter of Early Cambrian black rocks of Niutitang Formation from Xiangxi area China

2020 ◽  
Vol 112 ◽  
pp. 104057 ◽  
Author(s):  
Rizwan Sarwar Awan ◽  
Chenglin Liu ◽  
Hongwei Gong ◽  
Chao Dun ◽  
Chao Tong ◽  
...  
Keyword(s):  
Organic Matter ◽  
Sedimentary Environment ◽  
Early Cambrian ◽  
Niutitang Formation

Characteristics of particulate organic matter within the photic water column: A case study across the fronts in the indian sector of the Southern Ocean

2020 ◽  
Vol 178 ◽  
pp. 104851 ◽  
Author(s):  
Melena A. Soares ◽  
Parli V. Bhaskar ◽  
N. Anilkumar ◽  
Ravidas K. Naik ◽  
Jenson V. George ◽  
...  
Keyword(s):  
Organic Matter ◽  
Southern Ocean ◽  
Water Column ◽  
Particulate Organic Matter ◽  
Indian Sector
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