| 摘要: |
| 为探讨互花米草（Spartina alterniflora）入侵对我国沿海生态系统的影响，采用静态采样箱法，研究了互花米草入侵滩涂和临近未入侵滩涂在二甲基硫（DMS）、氧化亚氮（N2O）气体通量上的差异及其相关因素。结果显示，互花米草滩DMS和N2O释放量均显著高于临近光滩、盐蒿滩和芦苇滩。该两种气体释放量同植被地下生物量、总生物量以及土壤有效氮含量均呈显著正相关，DMS气体通量还与植被地上生物量有关，但两种气体通量与土壤有机质含量均无直接相关性。研究说明互花米草生物入侵不仅改变了生态系统结构，还能通过改变区域温室气体排放通量进而影响到全球气候变化。 |
| 关键词: 互花米草（Spartina alterniflora） 生物入侵 DMS N2O 盐沼 |
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| 基金项目:国家自然科学基金项目（30770358，3040054）；江苏省自然科学基金项目（BK2007152）；东华理工学院核资源与环境教育部重点实验室开放基金项目（060602） |
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| The influence of Spartina alterniflora invasion on emission of DMS and N2O in coastal salt marsh |
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ZHOU Chang-fang,AN Shu-qing,ZHAO Cong-jiao,FANG Chao,LU Xia-mei,ZHAO Hui,LIU Jing-na
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| Abstract: |
| To explore the influence of the Spartina invasion in Chinese coastal ecosystem, the flux of DMS and N2O and possible factors determining the flux were studied in the summer, 2005 in Yancheng Natural Reserve of the red-crowned Crane. The results showed that both DMS and N2O flux were significantly higher in S. alterniflora marsh than those in native Suaeda salsa and Phragmites australis marshes and on open mudflat. Both gases were positively correlated with underground and total biomass and soil available nitrogen. DMS emission was also positively correlated with aboveground biomass. However, no significant correlation was found between soil organic matter and the emission of either DMS or N2O. Our results indicate that S. alterniflora invasion has not only changed the structure of coastal ecosystem, but also influence the global climate by changing the regional budgets of greenhouse gases. |
| Key words: Spartina alterniflora biological invasion DMS N2O salt marsh |
