江苏如东海岸互花米草盐沼沉积物叶绿素a分布特征  

Distribution patterns of sediment chlorophyll-a in Spartina alterniflora salt marshes at Rudong coast of Jiangsu,East China

作　　者：王丹丹[1] 高抒[1] 杜永芬[1] 高文华[1] 

机构地区：[1]南京大学海岸与海岛开发教育部重点实验室,南京210093

出　　处：《生态学杂志》2012年第9期2247-2254,共8页Chinese Journal of Ecology

基　　金：国家自然科学青年基金项目(40906066);中国博士后基金项目(20100471282);江苏省博士后基金项目(0901016C);中央高校基本科研业务费专项资金(1117020914);江苏高校优势学科建设工程项目资助

摘　　要：潮间带沉积物叶绿素a(Chl-a))是潮间带生态系统底栖微藻初级生产力的表征因子。为了解互花米草盐沼沉积物Chl-a的分布,于2010年夏季及秋季对江苏如东海岸11个站位的表层底质(0～8cm)内Chl-a含量进行了分析。结果表明:垂直方向上,除10月1～5站位垂直分层不明显外,整体变化趋势为,在0～2cm,随深度的增加而锐减,2～8cm,变化较小,光照的垂直递减是造成这一趋势的原因;在水平方向上,夏季,沉积物Chl-a含量在互花米草盐沼高于光滩,秋季则相反;光照和沉积物组成的季节变化是造成沉积物Chl-a水平方向分布格局的直接原因;互花米草枝叶对光照的遮挡及对细颗粒物质的圈闭作用随植株生长阶段而变化;互花米草一方面通过促进细颗粒沉积物堆积影响底质的粒度组成,另一方面通过其枝叶生长影响滩面接受的光照,直接影响潮间带微藻的生长,继而影响底栖生态系统的初级生产力。Sediment chlorophylla （Chl-a） in intertidal zone is an indicator of the primary productivity of microphytobenthos in intertidal ecosystem. In order to understand the distribution patterns of the Chl-a in Spartina alterniflora salt marshes and bare flats at the Rudong coast of Jiangsu, surface （0-8 cm） sediment cores were collected from 11 sites in July and October 2010, with the Chl-a content determined. Except for the sites 1-5 in October, the vertical distribution of the Chl-a at other sites presented a similar trend, i.e., a rapid reduction with the depth in the top 2 cm and little change at the depth of 2-8 cm. The decrease of illumination was a major factor for this pattern. The horizontal distribution of the Chl-a in the salt marshes and bare flats was different between summer and autumn. In summer, the Chl-a content was higher in salt marshes than in bare flats; but in autumn, it was in adverse. Such a difference was due to the combined effects of illumination and sediment grain size. The shading of illumination and the trapping of finegrained sediment by S. alterniflora at its different growth stages varied, which directly affected the growth of benthic microalgae, and further, affected the primary productivity of microphytobenthos in the intertidal ecosystem.

关 键 词：叶绿素A 潮间带 互花米草 沉积物组成 

分 类 号：Q948.8[生物学—植物学]