摘要
鳗草在北半球温带海域广有分布,受到不同程度的人为干扰和环境胁迫,海草床面积急剧退化.为探讨鳗草对不同环境胁迫的适应性,于2014年11月—2015年10月对荣成天鹅湖草床的潮间带和潮下带的斑块区、鳗草草场边缘和鳗草草场内部4个生境的鳗草形态和繁殖能力进行了研究.结果表明:叶长、叶宽、节间长度/直径、地上生物量/地下生物量和分枝频率在不同月份和生境间差异显著,其中除了分枝频率最大值出现在草场边缘(88.4%)外,其他各项指标的最大值均出现在草场内部(分别为78.54 cm、7.93 mm、7.03和3.88).地上生物量/地下生物量的可塑性指数在各站位均较高(0.77~0.92),叶宽的可塑性(0.41~0.64)略小.不同生境中单株鳗草佛焰苞数差异不显著,而单位面积的佛焰苞数差异显著,在草场内部偏向于克隆生殖,而在人为干扰较大的斑块区倾向于有性生殖.
Eelgrass （Zostera marina）, a seagrass species widely distributed in the coastal regions of northern hemisphere, has suffered with a great decline due to a variety of anthropogenic and envi- ronmental stresses. In order to examine the adaptability of eelgrass to different environmental stres- ses, studies on the morphology and reproductive capacity of eelgrass had been carried out monthly from November 2014 to October 2015 at four different habitats of the Swan Lake, including patch area in intertidal area and subtidal area, eelgrass meadow edge, and eelgrass meadow area. The re- sults showed significant spatio-temporal variations in the morphological parameters and branch fre- quency of eelgrass shoots at different habitats of the Swan Lake. The highest values of leaf length, leaf width, aboveground/belowground biomass, and internode length/diameter were observed in the meadow area, i.e., 78.54 cm, 7.93 mm, 7.03 and 3.88, respectively, while the highest branch fre- quency was observed in the meadow edge （88.4%）. The plasticity index for aboveground/below- ground biomass was higher （ranging from 0.77 to 0.92） at the four habitats, but those for the leaf width was slightly lower （ranging from 0.41 to 0.64）. The number of spathes in each shoot showed no significant difference at different habitats, whereas the number of spathes per unit area was sig- nificantly different. Clonal reproduction was more dominant in meadow area than in the patch area where human disturbance was high.
出处
《应用生态学报》
CAS
CSCD
北大核心
2017年第5期1498-1506,共9页
Chinese Journal of Applied Ecology
基金
海洋公益性行业科研专项经费项目(201405010)资助~~
关键词
鳗草
形态适应性
形态学参数
生殖策略
Zostera marina
morphology adaptability
morphological parameter
reproductivestrategy.
