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潮间带盐沼植物对悬浮颗粒物黏附的差异性研究
Changes in suspended particulates adhering to salt marsh plants
投稿时间:2009-04-13??修订日期:2009-07-10
DOI:
中文关键词:??盐沼??植物??悬浮颗粒物??潮间带;长江口
英文关键词:salt marsh??vegetation??suspended particulate??intertidal??the Yangtze Estuary
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
李华?华东师范大学河口海岸学国家重点实验室?pillarhuar@126.com?
杨世伦?华东师范大学河口海岸学国家重点实验室?pillarhuar@sina.com?
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中文摘要:
??????为了认识潮间带盐沼植物对悬浮颗粒物黏附的差异性,在长江口选择了三种盐沼植物群落对它们黏附的颗粒物质量进行测定,结果表明,(1)植物群落距潮沟或光滩越近,生长位置的滩面高程越低,则黏附颗粒物越多。在盐沼前缘单位滩地面积上植物黏附颗粒物质量分数以1%~3%/m(单位水平距离)的速率从水体悬浮颗粒物浓度相对较高的盐沼外缘光滩或潮沟向盐沼内部减小。(2)植物黏附的颗粒物量在垂向上从上到下急剧增大,通常靠近滩面5~10 cm的部分植物的黏附量占植物黏附总量的三分之一以上。(3)相邻群落单位滩地面积的互花米草[(220.6 ? 172.7)g/m2]的总黏附量明显多于芦苇[(64.9 ? 38.1)g/m2]和海三棱藨草[(45.2 ? 31.7)g/m2];而单位滩地面积上三种盐沼植物的单位生物量黏附的颗粒物,以海三棱藨草[(150.5 ? 134.8)g/kg]最多,芦苇[(28.8 ? 22.8)g/kg]最少,互花米草[(57.5 ? 32.9)g/kg]介于两者之间。(4)海三棱藨草的黏附量季节差异性明显,秋初(9月)是春末(5月)的6倍,冬季该植物消失,其黏附颗粒物的功能也消失。造成盐沼植物黏附悬浮颗粒物差异的根本原因是生物量、悬浮颗粒物含量和淹没条件(淹没的深度、时间、频率)的不同。
英文摘要:
??????To understand difference in suspended particulates adhering to tidal marsh plants, we measured the mass of particulates adhering to three species of marsh plants in in the Yangtze Delta. The results include: (1) The mass of particulates adhering to plants growing on unit land area decreased at a rate of 1%–3%/m with distance from outer marsh edge or tidal creak where suspended sediment concentration was higher. (2) The mass of particulates adhering to plants decreased from the lowest stem section upward to the end of the plants.. The mass of particulates adhering to the lowest 5?10 cm stem length was more than 1/3 of the total. (3)The mass of particulates adhering to Spartina alterniflora (220.6 ? 172.7 g/m2) was greater than the mass of particulates adhering to Phragmites australis (64.9 ? 38.1 g/m2) and Scirpus mariqueter (31.6 ? 10.0 g/m2), because the biomass of S. alterniflora was greater than the biomass of P. australis and S. mariqueter. However, the mass of particulates adhering to unit plant biomass was highest for S. mariqueter (150.5 ? 134.8 g/kg) and lowest for P. australis (28.8 ? 22.8 g/kg), and in between for S. alterniflora (57.5 ? 32.9 g/kg). (4) The seasonal change in mass of particulates adhering to marsh plants could be significant. The mass of particulates adhering to S. mariqueter in September was six times more than that in May. In winter, this pioneer plant withered and was washed away by tidal water, and thereby loss its ability to trap suspended particulates. It was concluded that the mass of suspended particulates adhering to marsh plants is determined by plant biomass, suspended particulate concentration and submerged condition (the relative importance of elevation and tidal range).
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