Abstract
Tillage operations lead to a rapid release of carbon dioxide (CO2). However, most published studies have been related to the effects of soil preparation disturbance, such as mechanical‐powered fall or spring plowing, chiseling, or disking on CO2 emissions. Effects of soil disturbance, such as hand hoeing during plant growth, on CO2 flux are uncertain. We assessed 1) first‐year no‐till impacts and 2) short‐term (6 h) impacts of hand hoeing on fluxes of soil CO2 from a silt loam (typic Hapludolls) in northeast China, by determining CO2 built‐up in portable chambers (volume=65×65×25 cm3). No‐till practices decreased CO2 fluxes in the first year of adoption of the conservation practices compared with traditional plowing practices. Compared to no‐hoeing, a single hand hoeing operation can lead to a 2 kg CO2‐C ha−1 loss, about a 30% increase, within the first 3 hours of hoeing operation. Results suggest that no‐till practices may reduce CO2 emissions from this silt loam soil in northeast China, where farmland has been under intensive management for more than a century.
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