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通过盆栽模拟试验,用静态箱法采样,气相色谱测定样品CO2浓度,研究大豆出苗到开花期长期定量施肥土壤CO2排放速率的变化规律。结果表明,长期定量施肥大豆生长对土壤呼吸影响有明显的规律性,NPK+OM>NPK>NP>NK>CK;长期定量施肥对裸土呼吸速率影响较小,NPK+OM呼吸速率较大为53.8mgCm-2h-1,NP次之为50.7mgCm-2h-1,其它施肥影响不大,气温对裸土呼吸影响较大,而对种植大豆的土壤呼吸前期(出苗后9天)影响较大,生长后期(出苗9天以后)影响较小。裸土呼吸速率变化与气温变化趋势相似,种植大豆促进土壤呼吸增大。如果忽略大豆生长对土壤有机质分解的激发效应,大豆根际呼吸占总土壤呼吸的23%～56%。
The pot experiment was conducted to determine the CO2 concentration in the sample by static box method and gas chromatography. The change law of CO2 emission rate in long-term quantitative fertilization of soybean from seedling to flowering stage was studied. The results showed that the effect of long-term quantitative fertilization on soil respiration had obvious regularity, NPK + OM> NPK> NP> NK> CK. Long-term quantitative fertilization had little effect on the respiration rate of bare soil. The respiration rate of NPK + OM was 53.8mgCm-2h-1, NP followed by 50.7mgCm-2h-1, other fertilizers had little effect on temperature, but the temperature had a greater effect on bare soil respiration, but had a greater effect on soil respiration prophase (9 days after emergence) , Late growth (9 days after emergence) less affected. The change of bare soil respiration rate was similar to the change of temperature, so planting soybean increased soil respiration. Ignoring the stimulating effect of soybean growth on soil organic matter decomposition, rhizosphere respiration of soybean accounts for 23% -56% of total soil respiration.