CO2浓度升高对三江平原湿地土壤碳氮含量的影响

被引：10

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：

[1] 黑龙江省高校地理资源与环境遥感重点实验室

[2] 哈尔滨师范大学

[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

来源：

水土保持通报 | 2011年 / 31卷 / 02期

关键词：

CO2浓度升高; 湿地; 土壤有机碳; 土壤全氮;

D O I：

10.13961/j.cnki.stbctb.2011.02.006

中图分类号：

X144 [环境地理学];

学科分类号：

083001 ;

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。

引用

页码：6 / 9

页数：4

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