【摘要】 利用中国稻/麦轮作FACE(Free-Air Carbon-Dioxide Enrichment)试验平台,研究大气CO2浓度升高200μmol.mol-1(周围大气中CO2浓度约370μmol.mol-1)对稻季各生育期不同深度土壤溶液NH4+-N和NO3--N浓度的影响.结果表明:高CO2浓度条件下耕层土壤溶液NH4+-N浓度在水稻生育前期有所增加,但在生育后期明显下降;大气CO2浓度升高增加了稻季5、15、30、60和90 cm处土壤溶液NO3--N浓度,分别比对照平均提高了46.5%、36.8%、23.3%、103.7%和42.7%,在60和90 cm处差异分别达到统计上的极显著和显著水平.更多还原

【Abstract】 Taking the China rice/wheat FACE(Free-Air Carbon Dioxide Enrichment) as a platform,this paper studied the effects of elevated CO2 on the NH4+-N and NO3——N contents at different depths of paddy soil in rice season.Under elevated CO2,the NH4+-N content in plough layer increased at early growth stage but decreased at late growth stage,and the soil NO3——N content at the depths 5,15,30,60,and 90 cm increased by 46.5%,36.8%,23.3%,103.7%,and 42.7%,respectively,with a significant increase occurred at the depths 60 cm(P<0.01) and 90 cm(P<0.05),compared with the control.更多还原