Mao Peili, Han Guangxuan, Wang Guangmei, Yu Junbao, Shao Hongbo
Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Yantai 264003, China.
Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Yantai 264003, China ; Institute of Life Sciences, Qingdao University of Science & Technology, Qingdao 266042, China.
ScientificWorldJournal. 2014;2014:468036. doi: 10.1155/2014/468036. Epub 2014 May 15.
Effects of age and stand density of mother tree on seed germination, seedling biomass allocation, and seedling growth of Pinus thunbergii were studied. The results showed that age of mother tree did not have significant influences on seed germination, but it was significant on seedling biomass allocation and growth. Seedlings from the minimum and maximum age of mother tree had higher leaf mass ratio and lower root mass ratio than from the middle age of mother tree. Moreover, they also had higher relative height growth rate and slenderness, which were related to their biomass allocation. Stand density of mother tree mainly demonstrated significant effects on seed germination and seedling growth. Seed from higher stand density of mother tree did not decrease germination rate, but had higher mean germination time, indicating that it delayed germination process. Seedlings of higher stand density of mother tree showed higher relative height growth rate and slenderness. These traits of offspring from higher stand density of mother tree were similar to its mother, indicating significant environmental maternal effects. So, mother tree identity of maternal age and environments had important effects on natural regeneration of the coastal P. thunbergii forest.
研究了黑松母树年龄和林分密度对种子萌发、幼苗生物量分配及幼苗生长的影响。结果表明，母树年龄对种子萌发无显著影响，但对幼苗生物量分配和生长有显著影响。来自母树最小和最大年龄的幼苗比来自母树中年的幼苗具有更高的叶质量比和更低的根质量比。此外，它们还具有更高的相对高度生长速率和细长度，这与它们的生物量分配有关。母树林分密度主要对种子萌发和幼苗生长有显著影响。来自母树林分密度较高的种子发芽率并未降低，但平均发芽时间较长，表明其萌发过程延迟。母树林分密度较高的幼苗表现出较高的相对高度生长速率和细长度。母树林分密度较高的后代的这些特征与其母树相似，表明存在显著的环境母体效应。因此，母树年龄和环境的母体身份对沿海黑松林的天然更新有重要影响。
