水稻根系生物特性与稻田温室气体排放相关性研究

通过湖南双季稻区温室气体排放差异的水稻品种田间试验,研究了不同品种温室气体排放与根系特征的相关性。结果表明,早稻分蘖盛期CH4排放通量与根干重、伤流量均呈显著负相关（P〈0.05）;晚稻CH4排放通量与根伤流量呈极显著负相关（P〈0.01）;早稻N2O排放通量在分蘖盛期与根伤流量相关性极显著（P〈0.01）,在齐穗期与根体积、干重、根伤流量均呈极显著负相关（P〈0.01）;晚稻分蘖盛期,根系干重与体积均与N2O排放通量呈显著正相关（P〈0.05）;齐穗期,根系体积与N2O排放通量呈显著负相关（P〈0.05）;早稻分蘖盛期CO2排放通量与根系干重和根伤流量呈显著正相关关系（P〈0.05）,晚稻齐穗期根系伤流量与CO2排放通量负相关性达到极显著水平（P〈0.01）。因此,根系特性是影响水稻温室气体排放的重要因素。

Research on the Correlation Between the Greenhouse Gases Emission from Paddy Field and the Biological Characteristics of Rice Root System

A one-year＇s field experiment was conducted to study the correlation between the greenhouse gases emission and the root characteristics using early and late rice cultivars with different greenhouse gases emission fluxes in Hunan double cropping rice area.The results showed that CH4 emission flux was negatively correlated with root dry weight（P0.05） and amount of root exudates（P0.05） at the full tillering stage of early rice,and was negatively correlated with amount of root exudates（P0.01） in late rice.The N2O emission flux was negatively correlated with amount of root exudates（P0.01） at the full-tiller stage,and with root volume（P0.01） and root dry weight（P0.01） and amount of root exudates（P0.01） at the full-earring stage of early rice,and was positively correlated with root dry weight（P0.05） and root volume（P0.05） at the full-tiller stage,and was negatively correlated with root volume（P0.05） at the full-earring stage in late rice.The CO2 emission flux was positively correlated with root dry weight（P0.05） and root exudates（P0.05） at the early rice full-tiller stage,but was negatively correlated with root volume（P0.01） at the late rice full-tiller stage,and was negatively correlated with root exudates（P0.01） at the late rice full-earring stage.Therefore,rice root characteristics were an important factor to influence the greenhouse gases emission in paddy field.