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- W2053117362 abstract "Accurate estimates of soil organic C (SOC) stocks are required to determine changes in SOC resulting from agricultural management practices. Our objectives were to: (i) determine total SOC; (ii) estimate the contribution of light fraction C (LF-C) to total SOC; and (iii) simulate SOC dynamics using CQESTR to examine the effect of climate change for three cropping systems in the Pacific Northwest. The LF-C masked small gains or losses in measured SOC for all cropping systems. Simulated data indicated no significant changes in SOC in the top 30 cm of the sweep-tillage winter wheat (Triticum aestivum L.)–tillage fallow rotation (WW–TF) and no-till (NT) spring wheat–chemical fallow rotation (SW–CF/NT), whereas SOC increased in the NT spring barley (Hordeum vulgare L.)–spring wheat rotation (SB–SW/NT). The apparent increase in measured SOC with continuous NT spring cropping was the result of accumulated undecomposed crop residues that contributed to the labile C pool and was confirmed via LF-C analysis. The contributions of the LF-C to total SOC across cropping systems ranged from 13.4 to 18.4% (fall soil samples) and 14.4 to 18.9% (spring soil samples). Modeling predicted no significant change in SOC stocks for the WW–TF and SW–CF/NT rotations, even with a 30% crop biomass increase based on potential climate change scenarios. Differences between the observed and predicted SOC were due to artifacts associated with protocols used to determine SOC that did not completely remove accrued crop residue and could be explained by LF-C, which provided a first approximation of organic C accretion." @default.
- W2053117362 created "2016-06-24" @default.
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- W2053117362 date "2013-03-01" @default.
- W2053117362 modified "2023-09-25" @default.
- W2053117362 title "Soil Organic Carbon Accretion vs. Sequestration Using Physicochemical Fractionation and CQESTR Simulation" @default.
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- W2053117362 doi "https://doi.org/10.2136/sssaj2012.0303" @default.
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