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利用中国稻/麦轮作FACE(Free-Air Carbon Dioxide Enrichment)试验平台,研究了大气CO2浓度升高对稻季各生育期耕层土壤溶液中Cl-、CO32-、HCO3-、SO42-、NO3-和溶解无机磷(DIP)等阴离子浓度的影响,探讨了稻田生态系统土壤元素地球化学循环对大气CO2浓度升高的响应。结果表明:大气CO2浓度升高降低了土壤溶液SO42-浓度,提高了HCO3-浓度,与5cm处相比,其在15cm处的影响程度更大;大气CO2浓度升高有增加土壤溶液NO3-和溶解无机磷(DIP)的趋势;对CO32-和Cl-未表现出明显的规律性影响。文章还分析了大气CO2浓度升高对土壤溶液阴离子浓度产生影响的可能机理。
The effects of elevated atmospheric CO2 on Cl-, CO32-, HCO3-, SO42-, NO3-, and SO4- in topsoil in paddy soil during the rice growing season were studied using Free-Air Carbon Dioxide Enrichment (FACE) And dissolved inorganic phosphorus (DIP) and other anion concentrations, and discussed the response of paddy field soil element geochemical cycles to elevated atmospheric CO2 concentration. The results showed that: the increase of atmospheric CO2 concentration decreased the concentration of SO42- and increased the concentration of HCO3- in soil solution, which was more significant at 15cm than at 5cm; the increase of atmospheric CO2 concentration could increase the concentration of NO3- and Dissolved inorganic phosphorus (DIP) trends; CO32- and Cl- did not show a significant regularity. The paper also analyzes the possible mechanism of the increase of atmospheric CO2 concentration on the anion concentration of soil solution.