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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。
In order to further understand the environmental impact of tobacco carbon emissions on the environment, the daily box carbon dioxide analyzer was used to investigate the diurnal variation of carbon flux in different organic fertilizer fields in Enshi. The results showed that there was a clear diurnal variation pattern of carbon flux in tobacco field ecosystem at tobacco flat-top stage with the highest value occurring between 17:30 and 19:30 and the lowest value between 11:30 and 13:30 There was a significant and negative correlation with soil moisture. Substitution of vegetable flue-cured tobacco and tobacco straw bio-fertilizers significantly promoted the ecosystem carbon emissions of tobacco fields. However, the diurnal variation of carbon flux in tobacco soils was small, the maximum appeared at 9:30 and the minimum was at 7:30, and the trend of temperature and surface temperature, 5 cm and 10 cm were significant Or very significant positive correlation. The study found that the major contributor to carbon fluxes in tobacco ecosystem is net photosynthesis of tobacco, not soil respiration, and the diurnal variation of carbon flux in tobacco ecosystem is larger than that of soil.