Recent advances of relationship between deep tillage and soil greenhouse gas emissions
Deep tillage is an important agricultural farming practice and soil remediation measure;however,its impact on soil greenhouse gas(GHG)emissions remains unclear.This review summarized current research on the emissions of soil carbon dioxide(CO2),methane(CH4)and nitrous oxide(N2O)under deep tillage conditions.The results showed that deep tillage mainly affects soil chemical and biological properties by affecting its physical properties(e.g.,bulk density and aggregate stability),thus causing changes in GHG emissions.Deep tillage significantly increased soil CO2 emissions,which was mainly affected by aggregate stability and bulk density.Dryland soil was the sink of CH4,while paddy field was the source of CH4.Deep tillage reduced the absorption of CH4 by dryland soil and increased the emission of CH4 from paddy field,which was mainly due to changes in size and activity of methanogens and methane-oxidizing microbes in soil and soil aeration.The effect of deep tillage on N2O was mainly related to soil aeration.In soils with good aeration conditions,deep tillage significantly increased N2O emission;but in soils with poor aeration conditions,it showed a decreasing trend.Soil nitrification and denitrification were important processes affecting N2O emission.In addition,soil amendment,water management,climatic factors and other soil properties could further affect GHG emissions in deep tillage soils.In conclusion,effects of deep tillage on GHG emissions should be taken into serious consideration for both agricultural and green and low-carbon remediation practices.
deep tillagegreen and low-carbon remediationmethanecarbon dioxidenitrous oxide
NETL
NSTL
万方数据
