移植大叶藻的形态、生长和繁殖的季节性变化

通过对移植2年后的大叶藻(Zosteramarina L.)的形态、生长和繁殖情况进行4个季度的观察和测量,发现在春季(3月和4月)和初夏(6月)大叶藻叶的叶绿素含量较低,而其他季节相对较高;根在冬季(12月和1月)和初春(3月)最发达;叶及叶鞘长度,叶宽和每株成体的生物量都在夏季达到最高值,而在秋季降到最低值;单株大叶藻叶生产率的最高值和最低值也分别出现在夏季和秋季;大叶藻侧生苗在冬季的萌发率最高,而夏季未观测到有侧生苗萌出。结果显示,光照影响大叶藻叶绿素的含量;水温对移植大叶藻的形态、生长和无性繁殖产生显著影响,夏季高水温对大叶藻生长的抑制作用比冬季低水温的影响更大。

Seasonal variations in morphology,growth and reproductivity of eelgrass,Zostera marina

meadows have suffered a great decline in the world. In recent years, transplantation of seagrasses has been considered to be an effective method to mitigate and control seagrass degradation. To assess the adaptation of seagrass transplants to new environment, w of eelgrass plants, which were transplanted two years ago. Resulted showed that chlorophyll contents were lower in spring and early summer, but relatively higher during other period. Eelgrass roots were most abundant in winter and early spring. The length of sheath and leaves, width of leaves and the dry weight per individual shoots reached the maximum levels in summer, while the lowest values were observed in fall. The highest and the lowest values of leaf productivity per shoot occurred in summer and fall, respectively. The emergence rate of lateral shoots was the highest in winter, while no lateral shoot emergence was observed in fall. Results indicated that chlorophyll contents were affected by light, whereas the morphology, growth and clonal growth of eelgrass water temperature. In addition, the inducedwas greater than thatby lower water temperature in winter.