CO_2浓度升高对土壤中铜和镉形态分布的影响

Effects of Elevated CO_2 on Cu and Cd Fractions in the Soil

利用OTC-1型开顶式气候模拟装置,研究了不同浓度的CO2对小麦根际土壤中铜和镉的形态分布影响。结果表明:高浓度CO2条件下,铜和镉在土壤中的形态分布发生了改变,其中残渣态变化最大,可交换态有升高趋势,碳酸盐态、铁锰氧化物结合态及有机态变化相对较小。CO2浓度升高对不同品种的小麦影响不同,对低积累小麦的影响大于高积累小麦。

An experiment was conducted to investigate the effects of the doubled CO2 on Cu,Cd fractions of wheat＇s rhizosphere and irrhizosphere. The results were presented as follows： Cu, Cd fractions varied with the addition of CO2. Under the condition of 700ppm, the exchangeable fraction took a trend of increase, the residue transformed to a high degree, and the other fractions changed little. The elevated CO2 influenced the wheat of different accumulation types and their rhizosphere and irrhizosphere differently with the low accumulation kind exceeding the high one and rhizosphere surpassed irrhizosphere.