南方稻田生态系统产量形成期co2通量的研究

通过稻田生态系统3a CO2通量的日内变化、逐日变化趋势、CO2通量水平与产量高低的分析，以了解稻田生态系统产量形成期CO2通量特征、对产量的影响。将稻田CO2通量与光合有效辐射、气温进行回归分析，以掌握两者对水稻CO2同化消耗的影响。结果认为，水稻抽穗期、齐穗-乳熟CO2通量日变化呈较深“U”型，乳熟-成熟“U”型较浅；产量形成期白天CO2通量的逐日均值呈“√”型；抽穗期、齐穗-乳熟水稻处生长旺盛阶段，其白天CO2通量水平与产量高低基本一致；水稻对CO2的同化吸收与光合有效辐射、气温有极显著相关关系；南方稻作区对CO2的同化消耗强于三江平原等稻作区。

Study on CO2 flux during the yield formation stage in a southern paddy rice ecosystem

Based on 3-year measurements of CO2 flux and yield taken in a paddy rice field in the suburb area of Nanchang, diurnal characteristics and temporal trend of daily CO2 flux during the yield formation stage were analyzed to identify the major futures of CO2 flux and to investigate the relationship between CO2 flux and yield. The response of CO2 flux to photosynthetically active radiation and temperature was also studied through regressive analysis. CO2 flux shows "U" shape diurnal patterns during the period of heading and the period from full heading to milky maturity. The diurnal amplitude of CO2 flux is larger during the heading period. The average of day-time CO, flux demonstrates a "√" shape temporal trend during the yield formation period. Day-time CO2 flux is generally consistent with yield during the period of heading and the period from full head-ing to milky maturity. Assimilation of CO2 by rice is significantly correlated with photosynthetically active radi-ation and temperature. The uptake of CO2 by rice is stronger in southern paddy rice field than in Sanjiang plain.