Abstract
Paddy soil is an important emission source of agricultural greenhouse gases. The excessive application of chemical fertilizer to paddy soil is one of the important reasons for high greenhouse gas emissions. Emissions can be reduced through optimized agricultural management measures. The incorporation of Chinese milk vetch (CMV) and rice straw in the field to replace some of the chemical fertilizer can reduce the emissions of greenhouse gases, but the relationship between these emissions and soil properties after the incorporation of CMV and rice straw is unclear. Through the continuous determination of greenhouse gases and the physical and chemical properties of soil, it was found that the addition of CMV and straw could increase the emissions of methane (CH4) and carbon dioxide (CO2), but nitrous oxide (N2O) emissions were lower. The effect of the combined incorporating of CMV and rice straw on soil properties was more significant than CMV alone. It was also found that CH4 and CO2 emissions were positively correlated with microbial biomass carbon and nitrogen, pH, and soil catalase and β-xylosidase activities. In practice, we can reduce greenhouse gas emissions by water and fertilizer management.
Highlights
From a global perspective, the issue of climate warming is an emerging problem, and reducing non-carbon dioxide greenhouse gas emissions is a relatively fast way to reduce the impact of greenhouse gases on climate warming [1]
The excessive use of nitrogen fertilizer in agricultural production is the main cause of greenhouse gas emissions [1,8], so it is important to identify farmland management measures to reduce the use of chemical fertilizers
Treatment, methane emissions were consistently low during the incubation cycle; the highest value was 1.13 ng g−1 h−1, and a negative value appeared after 13 days (Figure 1)
Summary
The issue of climate warming is an emerging problem, and reducing non-carbon dioxide greenhouse gas emissions is a relatively fast way to reduce the impact of greenhouse gases on climate warming [1]. The agricultural sector is an important source of artificial greenhouse gas emissions, and proper farmland management can reduce agricultural greenhouse gas emissions [2,3]. Methane is the most abundant non-CO2 greenhouse gas [1], and rice cultivation is an important source of methane emissions in agricultural production [4]. The main greenhouse gas emitted from rice fields is methane, N2 O cannot be ignored. The excessive use of nitrogen fertilizer in agricultural production is the main cause of greenhouse gas emissions [1,8], so it is important to identify farmland management measures to reduce the use of chemical fertilizers
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