Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6296198 | Ecological Modelling | 2016 | 12 Pages |
Abstract
We also estimated long-term implications of varying residue removal rates on SOC. Model estimates compared to field data tested the hypothesis that long-term increased residue removal decreases SOC. Field observations showed 0.17, 0.09, and a â0.17 t C haâ1 yrâ1 change for control, harvest, and bare grass residue removal treatments, respectively. Simulated SOC loss was greatest for the most intensive residue removal scenarios (â0.48 and â0.68 t C haâ1 yrâ1 for corn and grass, respectively), compared to no-harvest scenarios that increased SOC by 0.05 t C haâ1 yrâ1 for both corn and grass. AGRO-BGC estimated a 0.07 t C haâ1 yrâ1 loss under corn residue harvest, while estimating 0.09 t C haâ1 yrâ1 loss for grass. Results suggest long-term increased corn and grass residue harvest (beyond grain) for biofuel feedstock will decrease SOC and soil productivity by approximately 15% in corn and 21% in grass systems over 47 years.
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Authors
Natalie D. Hunt, Stith T. Gower, Knute Nadelhoffer, Kate Lajtha, Kimberly Townsend, Kristofor R. Brye,