生长季与非生长季小叶章湿地N2O通量特征及排放贡献

草业学报 ›› 2009, Vol. 18 ›› Issue (6): 242-247.

生长季与非生长季小叶章湿地N₂O通量特征及排放贡献

孙志高^1,2,刘景双²,杨继松³,牟晓杰¹,王玲玲¹

1.中国科学院烟台海岸带研究所, 山东烟台 264003;
2.中国科学院东北地理与农业生态研究所,
吉林长春 130012;
3.沈阳大学,辽宁沈阳 110044

收稿日期:2008-12-31 出版日期:2009-12-20 发布日期:2009-12-20
作者简介:孙志高(1979-),男,山东烟台人,副研究员,博士。E-mail:zgsun@yic.ac.cn
基金资助:
国家自然科学基金项目(40803023),中国科学院“优秀博士学位论文、院长奖获得者”科研启动专项资金项目(AJ0809BX-036),山东省黄河三角洲生态环境重点实验室开放基金项目(2007KFJJ01),中国科学院知识创新工程重要方向项目(KZCX2-YW-223;KZCX2-YW-309)和中国科学院烟台海岸带所前沿领域项目(HJ0810BX-047)资助

N₂O flux characteristics and emission contributions of Calamagrostis angustifoliawetland during growth and non-growth seasons

SUN Zhi-gao^1,2, LIU Jing-shuang², YANG Ji-song³, MOU Xiao-jie¹, WANG Ling-ling¹

1.Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China；

2.Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences,
Changchun 130012, China；
3.Shenyang University, Shenyang 110044, China

Received:2008-12-31 Online:2009-12-20 Published:2009-12-20

摘要/Abstract

摘要： 2003年5月－2004年4月,利用静态箱-气相色谱法对生长季与非生长季三江平原小叶章湿地N₂O通量特征及排放贡献进行了研究。结果表明,生长季N₂O呈脉冲式排放,通量介于0.005～0.111 mg/(m²·h),5月较低通量与降水较多有关,6月通量骤然增加与冻层融通有关,7－8月与降水少及蒸发旺盛有关,9月与土壤中较多氮有关。N₂O通量与5 cm地温呈显著正相关(P＜0.01);非生长季N₂O表现为“吸收-排放”,通量介于-0.001 5～0.049 7 mg/(m²·h)。N₂O通量与气温、土壤融化时间均呈指数关系(P＜0.01),说明在冻结期,温度仍是控制微生物活性的主要因素,而在融化期,温度和冻层融通是导致N₂O通量迅速增加的重要原因。总之,生长季N₂O排放量为205.54 mg N₂O/m²,为N₂O的“源”,非生长季N₂O排放量为-26.97 mg N₂O/m²,为N₂O的“汇”,全年N₂O排放量为178.57 mg N₂O/m²,为N₂O重要释放“源”。

Abstract: The nitrous oxide (N₂O) flux characteristics and emission contributions of Calamagrostis angustifolia wetland in the Sanjiang Plain during growth and non-growth seasons were observed in situ with static-chamber and GC methods from May 2003 to April 2004. The range of N₂O fluxes during the growth season was 0.005-0.111 mg/(m²·h) and showed pulse emission characteristics. The lower N₂O fluxes in May were correlated with abundant precipitation, while the sharply increased fluxes in June were correlated with the thaw of frozen layers. Between July and August, the N₂O fluxes were correlated with less precipitation and greater evaporation, and in September, the flux depended on available nitrogen in the soil. Further analysis indicated that the N₂O fluxes during the growth season were significantly (P<0.01) positively correlated with 5 cm ground temperature. The range of N₂O fluxes during the non-growth season was -0.001 5-0.049 7 mg/(m²·h), presenting “absorption-emission” characteristics. Further analysis indicated that the relationship between the N₂O fluxes and atmospheric temperatures or soil thaw days was in accord with exponential model (P<0.01) indicating that, in the frozen period, temperature was still the main factor controlling microbial activity. In the thaw period, temperature and thaw of frozen layers were important for induction of the rapid increase in N₂O fluxes. In conclusion, the N₂O emission amount during growth season was 205.54 mg N₂O/m², acting as the emission “source”, while during non-growth season, it was -26.97 mg N₂O/m², the “sink”. Overall, the N₂O emission over the whole year was 178.57 mg N₂O/m², an important N₂O emission “source”.

中图分类号:

S161.2⁺1

孙志高,刘景双²,杨继松³,牟晓杰,王玲玲. 生长季与非生长季小叶章湿地N₂O通量特征及排放贡献[J]. 草业学报, 2009, 18(6): 242-247.

SUN Zhi-gao, LIU Jing-shuang, YANG Ji-song, MOU Xiao-jie, WANG Ling-ling. N₂O flux characteristics and emission contributions of Calamagrostis angustifoliawetland during growth and non-growth seasons[J]. Acta Prataculturae Sinica, 2009, 18(6): 242-247.

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生长季与非生长季小叶章湿地N₂O通量特征及排放贡献

N₂O flux characteristics and emission contributions of Calamagrostis angustifoliawetland during growth and non-growth seasons

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