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Labile Organic Carbon Fractions, Regulator of CO 2 Emission: Effect of Plant Residues and Water Regimes
Author(s) -
Hassan Waseem,
Bashir Safdar,
Ahmed Niaz,
Tanveer Mohsin,
Shah Adnan Noor,
Bano Rizwana,
David Julie
Publication year - 2016
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201400405
Subject(s) - total organic carbon , environmental chemistry , soil carbon , dissolved organic carbon , chemistry , carbon fibers , soil water , environmental science , soil science , materials science , composite number , composite material
The soil organic carbon (C) pool is the largest among the terrestrial C pools, and plays a vital role in the exchange of CO 2 . The increase in CO 2 emission from soil to atmosphere has raised concerns about potential global warming. The current study was conducted with the objectives to investigate the relationship between labile organic C fractions and CO 2 fluxes in an Alfisol soil treated with green manure (GM) and wheat straw (WS), and moisture regimes namely, W1 (50%) and W2 (100%). The incorporation of GM and WS increased ( p < 0.05) the CO 2 emission and labile C fractions under both water regimes. The CO 2 fluxes showed positive correlation with all measured soil labile organic C fractions, i.e ., total organic carbon (TOC), light fraction of organic carbon (LFOC), particulate organic carbon (POC), easily oxidizable carbon (EOC), dissolved organic carbon (DOC), microbial biomass carbon (MBC), reducing sugar carbon (RSC), and readily mineralizable carbon (RMC). The overall effect of labile C fractions on the CO 2 emission was in the order LFOC > POC > EOC > DOC > MBC > RSC > RMC > TOC. The results demonstrated that LFOC, POC, EOC, DOC, MBC, RSC, and RMC had higher effects on CO 2 fluxes as compared to TOC. The LFOC was more suitable and sensitive indicator than POC, EOC, DOC, MBC, WSC, RMC, and RSC for CO 2 emissions and change in the soil organic C status.