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

ZHAO Guang-ying; LIU Jing-shuang; ZHANG Xue-ping; QI Shao-qun; WANG Yang

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

- Effects of Elevated CO_2 on Soil Organic Carbon and Nitrogen of Wetlands in Sanjiang Plain
- Bulletin of Soiland Water Conservation Vol. 30, Issue 2, Pages: 6-9(2011)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2011
- 稿件说明：
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ZHAO Guang-ying, LIU Jing-shuang, ZHANG Xue-ping, et al. Effects of Elevated CO_2 on Soil Organic Carbon and Nitrogen of Wetlands in Sanjiang Plain[J]. Bulletin of Soiland Water Conservation, 2011, 30(2): 6-9.
DOI：

ZHAO Guang-ying, LIU Jing-shuang, ZHANG Xue-ping, et al. Effects of Elevated CO_2 on Soil Organic Carbon and Nitrogen of Wetlands in Sanjiang Plain[J]. Bulletin of Soiland Water Conservation, 2011, 30(2): 6-9. DOI：

摘要

利用开顶箱薰气室(open-top chamber

OTC)

设置正常大气CO

浓度(ambient CO

)和高CO

浓度(elevated CO

700μmol/mol)2个水平和不施氮(NN

0g/m

)

常氮(MN

5g/m

)和高氮(HN

15g/m

)3个氮素水平

研究了CO

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

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%。CO

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

浓度升高使土壤NH

—N的含量分别降低了8.2%(NN)

8.9%(MN)和9.7%(HN)。CO

浓度升高使不同N处理的土壤NO

—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CO

浓度响应的关键因素。

Abstract

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.

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