Home About us MoEF Contact us Sitemap Tamil Website  
About Envis
Whats New
Microorganisms
Research on Microbes
Database
Bibliography
Publications
Library
E-Resources
Microbiology Experts
Events
Online Submission
mn

Site Visitors

blog tracking


 
Soil Biology and Biochemistry
Vol. 58, 2013; Pages: 159 - 162

Combination of potential methanogenesis and microbial respiration as a scalar to determine the microbial biomass in submerged rice paddy soils

Prabhat Pramanik, Pil Joo Kim

Division of Applied Life Science (BK 21 Program), Gyeongsang National University, Jinju 660-701, South Korea.

Abstract

Both aerobic and anaerobic microbes are responsible for the fertility of soils by mineralizing organic matter. In water-logged soils, like rice paddy soils, anaerobic microbes have a great importance in the mineralization. We developed a method to determine microbial biomass in rice paddy soils by combining of anaerobic and aerobic microbial processes as a scalar for the microbial biomass. Potential methanogenesis was used to describe the anaerobic microbial community, while substrate-induced respiration (SIR) is related to the aerobic microbes. The calibration of the method was based on the total microbial biomass determined by fumigation extraction (FE) method. Microbial biomass carbon (MBC) could be calculated using the following equation: MBC = kcf (1.956 MA + 0.710 SIR + 10.192), where kcf = 2.142 ± 0.337 (coefficient based on the calibration against FE), MA = potential methanogenesis and SIR = substrate induced respiration. The MBC had shown significantly positive correlation (r = 0.830*) with the total C loss potential or C mineralization potential (μg C loss g−1 soil d−1) [={MA × (12/16)} + {SIR × (12/44)}] of rice paddy soils.

Keywords: Microbial biomass C; Methanogen activity; Microbial respiration; Rice paddy soil


 

 

 
Copyright © 2005 ENVIS Centre ! All rights reserved
This site is optimized for 1024 x 768 screen resolution