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Soil Carbon Dynamics and Carbon Budget of Newly Reconstructed Tall‐grass Prairies in South Central Iowa
Author(s) -
Guzman Jose G.,
AlKaisi Mahdi M.
Publication year - 2010
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2009.0063
Subject(s) - carbon sequestration , environmental science , biomass (ecology) , soil carbon , soil respiration , ecosystem , ecosystem respiration , agronomy , soil water , primary production , carbon dioxide , zoology , forestry , hydrology (agriculture) , ecology , soil science , biology , geography , geology , geotechnical engineering
In addition to their aesthetic and environmental qualities, reconstructed prairies can act as C sinks and potentially offset rising atmospheric CO 2 concentration. The objective of this study was to quantify C budget components of newly established prairies on previously cultivated land. Net ecosystem production (NEP) was estimated using a C budgeting approach that assessed SOC content, soil surface CO 2 –C emission, and above‐ and belowground plant biomass. Study was conducted in southern Iowa, in 2005 to 2007. Results show that differences between sites for potential total C input were primarily due to root biomass contributions, which ranged from 0.8 to 5.4 Mg C ha −1 Average potential aboveground biomass C input was 2.7 Mg C ha −1 in 2006 and 5.5 Mg C ha −1 in 2007. Total soil CO 2 –C emissions from heterotrophic respiration increased as prairie age increased from 2.9 to 4.0 Mg C ha −1 and 3.1 to 4.7 Mg C ha −1 in 2006 and 2007, respectively. Determination of NEP showed that the 1998 and 2003 reconstructed prairie sites had the greatest potential for soil C sequestration at 4.1 and 4.4 Mg C ha −1 Increases in SOC content were only observed in the youngest established prairie site (2003) and the no‐till site in 2003 at 2.1 and 2.6 Mg C ha −1 yr −1 , respectively. Declines of SOC sequestration rates occurred when potential C equilibrium was reached (R h = NPP) within 10 yr since prairie establishment.