摘要
为了深入了解烟田碳排放对环境的影响,利用静态箱-红外二氧化碳分析仪法对湖北恩施不同有机肥烟田碳通量的日变化特征进行了调查。结果表明,在烟草平顶期,烟田生态系统碳通量具有明显的日变化规律,最高值出现在17:30—19:30,最低值出现在11:30—13:30,其变化趋势与土壤湿度呈极显著负相关,菜枯、烟秆生物肥替代处理均显著促进了烟田生态系统碳排放。而烟田土壤碳通量的日变化整体波动较小,最大值出现在9:30,最小值在7:30,且其变化趋势与气温、地表温度、5 cm地温、10 cm地温均呈显著或极显著正相关。研究发现,烟田生态系统碳通量的主要贡献者是烟草的净光合作用,而不是土壤呼吸,且烟田生态系统碳通量的日变化幅度大于土壤。
Diurnal variation of CO2 emission fluxes in a flue-cured tobacco field at ceiling period under different organic fertilizer treatments were measured by closed chamber-infrared method. The results showed that the CO2 emission fluxes from ecosystem of tobacco field had obvious diurnal variation at ceiling period, The maximum emission flux appeared at 17：30-19：30, while the minimum at 11：30-15：30. The variation of CO2 emission fluxes was negatively correlated with soil moisture content significantly. Organic fertilizer application promoted CO2 emission fluxes in the tobacco field significantly, and there was no significant difference between the rapeseed cake fertilizer and the bio-organic fertilizer from tobacco stems. The diurnal variation of CO2 emission fluxes from soils in the tobacco field fluctuated slightly. The maximum emission flux appeared at 9：30, while the minimum at 7：30. The variation of CO2 emission flux was significantly or highly significantly and positively correlated with air temperature, surface temperature, 5em, and 10 cm soil temperature. CO2 emission fluxes of tobacco field ecosystem mainly came from net photosynthesis of tobacco, but not from soil respiration. Furthermore, the degree of diurnal variation of CO2 emission fluxes in tobacco field ecosystem was higher than that in soils in tobacco fields.
出处
《中国烟草科学》
CSCD
2013年第6期43-48,共6页
Chinese Tobacco Science
基金
中国烟草总公司科技重点项目"‘清江源’生态富硒特色烟叶生产关键技术研究与应用"(110201202014)
国家自然科学基金项目(41201291)
关键词
烟田
静态箱法
碳通量
日变化
flue-cured tobacco field
closed chamber technique
CO2 flux
diurnal variation
