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为了增强对全球变化背景下湿地生态系统碳氮循环的整体认识,采用稻田FACE(Free AirCO2Enrichment)试验(位于江苏省江都市,始于2004年)方法,研究了2006年位于江都市的稻田水体中总有机碳、总氮、可溶性有机碳、可溶性氮的动态变化.结果表明:大气CO2浓度升高显著提高了稻田水体中以上各指标含量(p<0.01),其中各有机碳的增幅均大于相应的氮.与对照相比,FACE田块水体中总有机碳、总氮、可溶性有机碳和可溶性氮分别平均提高了31.2%、25.9%、28.3%和25.6%.不同生育时期各指标含量存在显著差异(p<0.01).上述结果还表明,大气CO2浓度增高不仅会通过富营养化稻田水体来影响水稻安全生产,而且还会提高其中可溶性碳氮含量,进而可能通过田间排水尤其是水稻生长前期暴雨导致的洪涝来增加稻田碳氮向周边水域的输送,从而影响到稻田生态系统的碳氮循环和土壤生产力.
In order to enhance the overall understanding of the carbon and nitrogen cycle of wetland ecosystems in the context of global change, the FACE (Free Air CO2 Enrichment) test in paddy field (located in Jiangdu City, Jiangsu Province since 2004) Total organic carbon, total nitrogen, soluble organic carbon and soluble nitrogen in the paddy field.The results showed that the increase of atmospheric CO2 concentration significantly increased the content of each index (p <0.01), and the increase of each organic carbon was greater than the corresponding Compared with the control.The total organic carbon, total nitrogen, dissolved organic carbon and soluble nitrogen in FACE plots increased by 31.2%, 25.9%, 28.3% and 25.6% respectively on average compared with the control.The content of each index in different growth stages was significant (P <0.01) .The above results also show that the increase of atmospheric CO2 concentration will not only affect the safe production of rice through eutrophic water in paddy field, but also increase the content of soluble carbon and nitrogen in the paddy field, Floods caused by torrential rains can increase the transport of carbon and nitrogen in the paddy fields to surrounding waters, affecting the carbon and nitrogen cycle and soil productivity in paddy ecosystems.