such as "Introduction", "Conclusion"..etc
Authors report that within the first 5 yr of
adopting a no-tillage practice in a heavy clay soil, nitrous oxide
emissions could offset the soil carbon dioxide sink.
in the response of nitrous oxide emissions when converting to a no-till
practice between the clay and loam soils were striking. While emissions
were similar in both tillage treatments in the well-aerated loam, they
more than doubled under no-till in the clay soil. Differences in
emissions between tillage practices in the clay soil were observed in
spring and summer but were greater and more consistent in the fall
after plowing operations. The influence of plowing on nitrous oxide
flux in the heavy clay soil was likely the result of increased soil
porosity that maintained soil aeration and water content at levels
restricting denitrification and nitrous oxide production. Accordingly,
denitrification rates are usually increased in denser and wetter
no-till soils and the anticipated benefits of the adoption of soil
conservation practices on net soil-surface greenhouse gas emissions
could be offset by increases in nitrous oxide emissions. Predicting
the impacts of no-till on nitrous oxide emissions is required for a
full assessment of the influence of this practice on net greenhouse gas
emissions. Researchers at Agriculture and Agri-Food Canada are pursuing
their investigations to understand the factors that control the
mechanisms leading to nitrous oxide emissions under contrasting soil
tillage practices. Specifically, they now focus
their efforts on the role of soil aeration with the hypothesis that the
“adoption of no-till only increases nitrous oxide emissions in poorly
aerated soils”. Field
studies and mathematical modeling of the impact of no-till on soil
nitrous oxide emission has yielded contrasting results and an
explanation of the high intersite variability of the influence of
no-till on soil nitrous oxide emissions is still lacking.
News release courtesy of Soil Science Society of America (SSSA).
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