大气CO_2浓度升高和施氮对麦季土壤有效态微量元素含量的影响  

Effect of CO_2 Enrichment and N Supply on Concentrations of DTPA-extractable Microelements of Soils in Wheat Season

作　　者：王小治[1,2] 孙伟[2] 封克[2] 任思荣[1] 谢祖彬[1] 朱建国[1] 

机构地区：[1]土壤与农业可持续发展国家重点实验室,中国科学院南京土壤研究所,江苏南京210008 [2]扬州大学环境科学和工程学院,江苏扬州225009

出　　处：《农业环境科学学报》2008年第2期530-534,共5页Journal of Agro-Environment Science

基　　金：国家自然科学基金重大国际合作项目(40120140817);中国科学院知识创新重要方向项目(KZCX-2-408);江苏省“青蓝工程”

摘　　要：利用中国的稻/麦轮作FACE(Free Air Carbon-dioxide Enrichment)平台技术,研究大气CO2浓度升高(比周围大气高200μmol·mol-1)和不同施N水平(常氮,250kgN·hm-2;低氮,150kgN·hm-2)对麦田土壤微量元素有效性的影响。结果表明,CO2浓度升高在一定程度上增加了土壤有效态微量元素含量,其中对DTPA-Cu和Zn的增加趋势尤为明显;常规施氮水平下土壤有效态微量元素含量高于低氮水平。对CO2浓度升高增加了土壤微量元素有效性的原因做了初步分析,并指出大气CO2浓度增加可能会影响到农业生态系统中土壤微量元素的地球化学循环。FACE （free-air carbon dioxide enrichment） in China was used to study the effects of elevated CO2 and N supply on the availability of microelements in soils during the wheat growing season. The results showed that elevated CO2 increased, to some extent, the concentrations of soil DTPA-extractable microelements at different stages of wheat growth, especially the concentrations of DTPA-extractable Cu and Zn. The concentrations of DTPA-extractable microelements in soils in the normal N treatment （NN, 250 kg N·hm^-2） were higher than those in the low N treatment （LN, 150 kg N·hm^-2） under both FACE and ambient conditions. The reason of the increase in the soil DTPA-extractable microelement concentrations by elevated CO2 was discussed in this paper. The geochemistry cycle of the microelements in soils of the agricultural ecosystem could be influenced by elevated CO2 in the atmosphere.

关 键 词：CO2浓度升高 麦季 N 微量元素 

分 类 号：X171.1[环境科学与工程—环境科学]