苏北海滨湿地互花米草地上生物量动态

在江苏盐城新洋港滩涂由海向陆建立样地:零星米草斑块(SAP)、稳定米草滩下边缘(SAFI)、2003年米草定居处(SAF03)、1989年米草定居处(SAF89),对互花米草(Spartina alterniflora)的生物量动态变化进行了研究。结果表明:1)除SAF03样地外,其他样地互花米草叶生物量随时间的推移都有不同程度的减少,SAF03叶生物量始终都显著高于其他样地(P<0.05);各样地茎和繁殖器官生物量均有所增加,繁殖前期SAFI处茎生物量增长最快,达18.97g.m2.d-1;离海越近繁殖器官生物量增加越大;11月份SAF89样地各器官生物量顺序为:叶>茎>繁殖器官,其他样地:茎>叶>繁殖器官。2)各次调查中,随着时间的推移各样地叶生物量分配减少,而茎生物量与繁殖器官生物量分配增多;由陆向海各样地叶生物量分配减少,而茎生物量与繁殖器官生物量分配增加。3)SAFI处互花米草地下/地上生物量的比值为2.39,极显著高于其他样地(P<0.01)。

Above-ground Biomass Dynamics of Spartina Alterniflora in the Coastal Wetland of North Jiangsu

Sample plots including Spartina alterniflora patch(SAP),S.alterniflora flat infra-edge(SAFI),S.alterniflora flat 2003(SAF03)and S.alterniflora flat 1989(SAF89)were established landward on the intertidal flat of Xinyanggang in Yancheng of North Jiangsu,in which the above-ground biomass dynamics of S.alterniflora was studied.The results show that: 1) The leaf biomass of S.alterniflora has,in different degrees,reduced with time except for SAF03,where the leaf biomass is always significantly higher(P<0.05) than other plots.The biomasses of the stem and the reproductive organs increase to some extent at each of the plots,of which the stem biomass increases fast before the propagation stage,reaching to 18.97 g·m2· d-1.The biomass of the reproductive organs increases in a large amount in the near-sea area.In November,the order of the biomass of different organs is,from higher to lower,leaf>stem>reproductive organs in the SAF89 plot and stem>leaf>reproductive organs in other plots;2) Both with the course of time and from the land toward the sea,the leaf biomass decreases in its proportion,while the biomasses of both the stem and the reproductive organs increase in proportion;3) The ratio of the Under-/above-ground biomasses of S.alterniflora is 2.39 in the SAFI plot,being extremely higher than those(P<0.01) in other plots.