CO_2浓度升高对三江平原湿地土壤碳氮含量的影响  

Effects of Elevated CO_2 on Soil Organic Carbon and Nitrogen of Wetlands in Sanjiang Plain

作　　者：赵光影[1,2,3] 刘景双[3] 张雪萍[1,2] 齐少群[1,2] 王洋[3] 

机构地区：[1]黑龙江省高校地理资源与环境遥感重点实验室,黑龙江哈尔滨150025 [2]哈尔滨师范大学,黑龙江哈尔滨150025 [3]中国科学院东北地理与农业生态研究所湿地生态与环境重点实验室,吉林长春130012

出　　处：《水土保持通报》2011年第2期6-9,共4页Bulletin of Soil and Water Conservation

基　　金：中国科学院湿地生态与环境重点实验室开放基金"三江平原湿地枯落物混合分解特征研究"(WELF-2009-B-002);哈尔滨师范大学青年学术骨干资助计划项目(09XBKQ04);中国科学院知识创新工程重要方向项目(KZCX2-YW-309);国家自然科学基金(4107103341071056)

摘　　要：利用开顶箱薰气室(open-top chamber,OTC),设置正常大气CO2浓度(ambient CO2)和高CO2浓度(elevated CO2,700μmol/mol)2个水平和不施氮(NN,0g/m2),常氮(MN,5g/m2)和高氮(HN,15g/m2)3个氮素水平,研究了CO2浓度升高对三江平原草甸小叶章湿地(Calamagrostis angustifolia)土壤碳氮含量的影响。结果表明,CO2浓度升高连续运行两个生长季后,湿地土壤总有机碳含量没有显著变化,不同N处理增加了0.5%～1.8%。CO2浓度升高,土壤总氮含量总体呈下降趋势。就各生长期平均值而言,CO2浓度升高使土壤NH4+—N的含量分别降低了8.2%(NN),8.9%(MN)和9.7%(HN)。CO2浓度升高使不同N处理的土壤NO3-—N含量也呈降低趋势,其中高氮水平(HN)降低最多,降幅为9.6%。土壤有效态氮是控制植物对高CO2浓度响应的关键因素。The effects of CO2 concentration and nitrogen supply on the contents of soil organic carbon and total nitrogen in Calamagrostis angustifolia wetlands of Sanjiang Plain was investigated.An experiment was carried out with treatments differed in nitrogen supplies（0,5 and 15 g/m2） and CO2 levels（350 and 700 μmol/mol） with OTC（open-top chamber） equipments.The results show that with additional nitrogen,the soil organic carbon varied but not significantly with increases of 0.5%~1.8%.The elevated CO2 decreased the contents of soil total nitrogen.The average reduction of NH＋4—N due to the elevated CO2 elevation was 8.2%,8.9% and 9.7%,for the three nitrogen levels,respectively.The contents of NO-3—N decreased similarly under higher CO2 levels.Both NH＋4—N and NO-3—N decreased to a greater degree with the high N supply（15 g/m2）.Soil available N was the key factor in affecting the response of the plants to elevated CO2.

关 键 词：CO2浓度升高 湿地 土壤有机碳 土壤全氮 

分 类 号：X144[环境科学与工程—环境科学]