Publication Abstracts
Beem-Miller et al. 2016
Beem-Miller, J.P., , S. Ogle, and D. Wolfe, 2016: Sampling for soil carbon stock assessment in rocky agricultural soils. Soil Sci. Soc. Amer. J., 80, no. 5, 1411-1423, doi:10.2136/sssaj2015.11.0405.
Coring methods commonly employed in soil organic C (SOC) stock assessment may not accurately capture soil rock fragment (RF) content or soil bulk density (ρb) in rocky agricultural soils, potentially biasing SOC stock estimates. Quantitative pits are considered less biased than coring methods but are invasive and often cost-prohibitive. We compared fixed-depth and mass-based estimates of SOC stocks (0.3-m depth) for hammer, hydraulic push, and rotary coring methods relative to quantitative pits at four agricultural sites ranging in RF content from < 0.01 to 0.24 M3m-3. Sampling costs were also compared. Coring methods significantly underestimated RF content at all rocky sites, but significant differences (p < 0.05) in SOC stocks between pits and corers were only found with the hammer method using the fixed-depth approach at the < 0.01 M3m-3 RF site (pit, 5.80 kg C m-2; hammer, 4.74 g C m-2) and at the 0.14 M3m-3 RF site (pit, 8.81 kg C m-2; hammer, 6.71 kg C m-2). The hammer corer also underestimated ρb at all sites as did the hydraulic push corer at the 0.21 M3m-3 RF site. No significant differences in mass-based SOC stock estimates were observed between pits and corers. Our results indicate that (i) calculating SOC stocks on a mass basis can overcome biases in RF and ρb estimates introduced by sampling equipment and (ii) a quantitative pit is the optimal sampling method for establishing reference soil masses, followed by rotary and then hydraulic push corers.
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BibTeX Citation
@article{be02200w,
author={Beem-Miller, J. P. and Kong, A. Y. Y. and Ogle, S. and Wolfe, D.},
title={Sampling for soil carbon stock assessment in rocky agricultural soils},
year={2016},
journal={Soil Sci. Soc. Amer. J.},
volume={80},
number={5},
pages={1411--1423},
doi={10.2136/sssaj2015.11.0405},
}
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RIS Citation
TY - JOUR ID - be02200w AU - Beem-Miller, J. P. AU - Kong, A. Y. Y. AU - Ogle, S. AU - Wolfe, D. PY - 2016 TI - Sampling for soil carbon stock assessment in rocky agricultural soils JA - Soil Sci. Soc. Amer. J. VL - 80 IS - 5 SP - 1411 EP - 1423 DO - 10.2136/sssaj2015.11.0405 ER -
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