Microbial cell-envelope fragments and the formation of soil organic matter: a case study from a glacier forefield

2012 ◽  
Vol 113 (1-3) ◽  
pp. 595-612 ◽  
Author(s):  
Christian Schurig ◽  
Rienk H. Smittenberg ◽  
Juergen Berger ◽  
Fabio Kraft ◽  
Susanne K. Woche ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Cell Envelope ◽  
Microbial Cell ◽  
Glacier Forefield

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.

Estimating Soil Organic Matter: A Case Study of Soil Physical Properties for Environment-Related Issues in Southeast Nigeria

2021 ◽  
Author(s):  
Kokei Ikpi Ofem ◽  
Kingsley John ◽  
Mark Pawlett ◽  
Michael Otu Eyong ◽  
Chukwuebuka Edwin Awaogu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Physical Properties ◽  
Soil Physical Properties

Environmental and Anthropogenic Factors Driving Changes in Paddy Soil Organic Matter: A Case Study in the Middle and Lower Yangtze River Plain of China

Pedosphere ◽  
2017 ◽  
Vol 27 (5) ◽  
pp. 926-937 ◽  
Author(s):  
Naijia GUO ◽  
Xuezheng SHI ◽  
Yongcun ZHAO ◽  
Shengxiang XU ◽  
Meiyan WANG ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Paddy Soil ◽  
Yangtze River ◽  
Anthropogenic Factors ◽  
Lower Yangtze ◽  
River Plain

scholarly journals Spatial-Temporal Variability of Soil Organic Matter in Urban Fringe over 30 Years: A Case Study in Northeast China

2019 ◽  
Vol 17 (1) ◽  
pp. 292
Author(s):  
Hongbin Liu ◽  
Shunting Li ◽  
Yuepeng Zhou
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Temporal Variation ◽  
Household Survey ◽  
Urban Fringe ◽  
Organic Fertilizers ◽  
Agricultural Planning ◽  
Study Sites

The study on soil organic matter (SOM) is of great importance to regional cultivated land use and protection. Based on data collected via continuous and high-density soil samples (0–20 cm) and socio-economic data collected from household survey and local bureau of statistics, this study employs geostatistics and economic statistical methods to investigate the spatial-temporal variation of SOM contents during 1980–2010 in the urban fringe of Sujiatun district in Shenyang City, China. We find that: (1) as to temporal variation, SOM contents in the study sites decreased from 30.88 g/kg in 1980 to 22.63 g/kg in 2000. It further declined to 20.07 g/kg in 2010; (2) in terms of spatial variation, the closer to city center, the more decline of SOM contents. Contrarily, SOM contents could even rise in outer suburb area; and (3) SOM content variation may be closely related to human factors such as farmers’ land use target and behaviour including inputs of chemical and organic fertilizers, types of crops and etc. These findings are conductive to grasp the overall trend of SOM variation and the influence of farmers’ land use behaviour on it. Furthermore, they could provide support for policymakers to agricultural planning and land use monitoring, which consequently aids the improvement of soil quality and food production in the urban fringe areas.

Sign in / Sign up

Export Citation Format

Share Document