[Effects of Irrigation and Biochar Application on the Respiratory Temperature Sensitivity of Paddy Soil].

The ecosystem respiration and temperature sensitivity () of paddy soil play very important roles in the emission of greenhouse gases from paddy ecosystems. Under intermittent irrigation and flooding irrigation conditions, a static opaque chamber and gas chromatography method were applied to study the regulation and influence of ecosystem respiration and using five treatments:no fertilizer (CK), conventional fertilization (NPK), 10t·hm biochar with chemical fertilizer (LBC), 20t·hm biochar with chemical fertilizer (MBC), and 40t·hm biochar with chemical fertilizer (HBC). The results showed that:① The temperature sensitivity coefficients () of ecosystem respiration under flooding irrigation were 4.

[Effects of Biochar Application Rates on Greenhouse Gas Emissions in the Purple Paddy Soil].

In order to explore the effects of different amounts of biochar applied in purple paddy soil on greenhouse gas (GHG) emissions, potted experiments using a static opaque chamber and gas chromatography method were used to study the regulations and influences of biochar on soil greenhouse gas emission using five treatments:no fertilizer (CK), conventional fertilization (NPK), 10 t ·hm biochar+NPK (LBC), 20 t ·hm biochar+NPK (MBC), and 40 t ·hm biochar+NPK (HBC). ① Soil CH emission flux reduced significantly with all biochar application treatments; the emission flux followed the order, from large to small, of NPK > CK > LBC > MBC > HBC. The CH emission flux of each treatment showed a single peak curve, and the peak value was mainly concentrated in the late growth stage of the paddy cropland.