摘要
利用模拟培养试验研究了外源水溶性有机物(DOM)添加量和培养温度对红壤中Cu形态的影响.结果表明:与不添加DOM比较,添加不同量的DOM均可提高土壤中交换态Cu的含量、降低铁锰结合态Cu含量;随着培养时间的延长,不同DOM添加量下土壤交换态Cu含量呈逐渐下降趋势;至试验结束时,DOM添加量为250mg·L-1时土壤交换态和碳酸盐结合态Cu含量最高,添加量为500mg·L-1时铁锰结合态Cu含量最高;不同DOM添加量下,土壤中有机结合态Cu含量较CK增加10.67%～23.66%.在25℃和45℃温度条件下,添加DOM后土壤交换态和铁锰结合态Cu含量均随培养时间的延长呈下降趋势,但在5℃下变化趋势相反;3种温度下添加DOM后土壤碳酸盐结合态Cu含量有随培养时间延长而增加的趋势.随着培养温度的升高,土壤有机结合态Cu含量增加,但在温度较低(5℃)时土壤残渣态Cu含量下降.
A simulating incubation test was conducted to evaluate the effects of exogenous dissolved organic matter（DOM） and incubation temperature on the copper forms in red soil.Comparing with the control,adding different amount of DOM increased the content of soil exchangeable Cu,but decreased the content of soil Fe-Mn bound Cu.With increasing time of incubation,the content of soil exchangeable Cu in all DOM-added treatments had a decreasing trend.By the end of the incubation,treatment 250 mg DOM·L-1 had the highest contents of soil exchangeable Cu and carbonate bound Cu,while treatment 500 mg DOM·L-1 had the highest content of soil Fe-Mn bound Cu.In the treatments with DOM addition,the content of soil organic bound Cu increased by 10.67% 23.66%,compared with the control.At incubation temperature 25 ℃ and 45 ℃,the contents of soil exchangeable Cu and Fe-Mn bound Cu decreased with increasing time of incubation;while at 5 ℃,an opposite trend was observed.At these three temperatures,the content of soil carbonate bound Cu in treatments with DOM addition increased with incubation time.The content of soil organic bound Cu increased with increasing temperature,but that of soil residual Cu decreased at lower temperature（5 ℃）.
出处
《应用生态学报》
CAS
CSCD
北大核心
2010年第11期2959-2964,共6页
Chinese Journal of Applied Ecology
基金
国家"十一五"科技支撑计划项目(2006BAD05B01)
国家高技术研究计划项目(2006AA10Z419)资助
关键词
水溶性有机物
红壤
铜形态
dissolved organic matter（DOM）
red soil
copper form.
