稻季土壤溶液中微量元素浓度对大气CO_2浓度升高的响应  

Effect of CO_2 enrichment on microelements concentration in soil solution in the rice season

作　　者：王小治[1,2] 孙伟[1] 封克[1] 朱建国[2] 

机构地区：[1]扬州大学环境科学与工程学院,江苏扬州225127 [2]中国科学院南京土壤研究所//土壤与农业可持续发展国家重点实验室,江苏南京210008

出　　处：《生态环境学报》2010年第2期307-313,共7页Ecology and Environmental Sciences

基　　金：国家自然科学基金重大国际合作项目(40120140817);土壤与农业可持续发展国家重点实验室开放课题(0551000005);江苏省"青蓝工程"资助;扬州大学科技基金项目(2008CXJ015;2009CXJ016)

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(比周围大气高200μmol·mol-1)对2007年稻季各生育期不同深度土壤溶液微量元素质量浓度影响。结果表明,大气CO2浓度升高对不同深度土壤溶液微量元素质量浓度的影响在不同生育期有所差异;尽管大多未达显著水平,大气CO2浓度升高表现出增加不同层次土壤溶液微量元素质量浓度的趋势,对土壤溶液Fe质量浓度增加程度尤为明显;从整个生育期看,FACE对土壤溶液Fe质量浓度增加幅度在5、15、30、60和90cm处分别为47.6%,36.3%,7.6%,37.0%和201.8%。大气CO2浓度升高对稻田土壤溶液微量元素质量浓度的长期影响需要进一步深入研究。FACE （Free-air Carbon Dioxide Enrichment） in China was used to study the effects of elevated CO2 on microelements concentration in soil solution at different depth in the rice season.The results showed that elevated CO2 had different effects on Fe,Mn,Cu and Zn concentration in soil solution at different stages.Although mostly had not significant,atmospheric CO2 enrichment had a trend of increasing Fe,Mn,Cu and Zn concentration in soil solution at different depths,especially in Fe concentration.FACE condition increased Fe concentration in soil solution at 5,15,30,60 and 90 cm depth in the whole rice growth period,with 47.6%,36.3%,7.6%,37.0% and 201.8%,respectively.The significant increase occurred at 60 cm （P0.01） and 90 cm （P0.05） depth,while there was no significant difference at 5,15 and 30 cm depth.The reason of the increase in the NO3--N concentrations in soil solution by elevated CO2 was discussed in this paper.The response of microelements in soil solution in rice season to elevated atmospheric CO2 needs further study.

关 键 词：CO2浓度升高 稻季 稻田土壤 微量元素 

分 类 号：X144[环境科学与工程—环境科学] S153.61[农业科学—土壤学]