单 位：
中国科学院清原森林生态实验站;中国科学院大学;森林与土壤生态国家重点实验室中国科学院沈阳应用生态研究所;建平县林业局
关键词：
蒙古栎;种子更新;萌蘖更新;生物量分配;叶面积指数;δ13C
摘 要：
通过比较辽东山区一年生蒙古栎实生幼苗和萌生幼苗的生长指标,探讨不同更新方式(种子更新与萌蘖更新)下1年生蒙古栎幼苗维持生长的形态和养分分配特征的差异。结果表明:1年生蒙古栎幼苗各器官的生物量在实生幼苗和萌生幼苗之间存在显著差异,主要表现为萌生幼苗叶重和茎重和茎质比均显著大于实生幼苗,实生幼苗的叶质比、光合组织/非光合组织大于萌生幼苗(P<0.05);萌生幼苗生长性状表现出茎矮而粗的特征,实生幼苗表现出茎高而细、根系粗而长的特征;比叶面积、叶片氮含量、叶片δ13C含量在两种更新起源的幼苗之间无显著差异;萌生幼苗茎、叶和单株含水量均大于实生幼苗(P<0.05);幼苗各器官结构性碳和非结构性碳含量在不同更新方式之间无显著差异,但萌生幼苗叶片、茎可溶性糖含量显著小于实生幼苗,萌生幼苗的叶片淀粉库显著大于实生幼苗(P<0.05);可见,两种更新方式的蒙古栎幼苗通过不同的生长策略适应环境:萌生幼苗依赖于母体供应的养分和水分维持生长,同时将自身光合作用积累的淀粉储存于叶片中;实生幼苗主要依靠茎的高生长、增加光合组织生物量以便最大限度地利用光资源,同时通过在叶片和茎内储存更多的可溶性糖含量维持自身生长。
译 名：
Comparison of growth characteristics between 1-year-old seedlings of Quercus mongolica through seed germination and sprout regeneration
作 者：
GANG Qun;YAN Qiao-ling;LIU Huan-bin;ZHANG Min;State Key Laboratory of Forest and Soil Ecology,Institute of Applied Ecology,Chinese Academy of Sciences;Qingyuan Experimental Station of Forest Ecology,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Forestry Bureau of Jianping County,Liaoning Province;
关键词：
Quercus mongolica;;seed regeneration;;sprout regeneration;;biomass allocation;;specific leaf area;;δ13C
摘 要：
This study aimed to explore the differences in morphology and nutrient distribution of Quercus mongolica seedlings from two regeneration types( i. e.,seed regeneration and sprout regeneration) by comparing the growth characteristics of 1-year-old seedlings and sprouts in a montane region of eastern Liaoning Province,China. The results showed that there were significant differences in biomass between seedlings and sprouts. Specifically,the leaf weight,stem weight,and stem weight to aboveground biomass ratio of sprouts were significantly greater than those of seedlings( P < 0. 05). leaf weight to above ground biomass ratio,Photosynthetic tissue-to-nonphotosynthetic tissue ratio of seedlings were significantly higher than those of sprouts( P <0. 05). The growth traits of sprouts were characterized by short and thick stems while the seedlings exhibited tall and small stems with thick and long roots. There were no significant differences in specific leaf area,nitrogen content and δ13C in leaf between seedlings and sprouts( P >0. 05). The water content of sprouts was significantly greater than that of seedlings( P < 0. 05).There were no significant differences in the contents of structural carbon and non-structural carbon between seedlings and sprouts( P > 0. 05). However,the sprouts had significantly less soluble sugar contents in leaf and stem,and a significantly greater starch pool in leaf than the seedlings( P < 0. 05). It can be concluded that there are different growth strategies to acclimating the local environments for seedlings of Q. mongolica from two regeneration types. Sprouts of Q. mongolica sustain their growth relying on the nutrients and water supplied by parent plants,meanwhile,much more starch produced by photosynthesis is stored in their leaves. However,the seedlings of Q. mongolica tend to raise the growth of stem and the biomass of photosynthetic tissue to most utilize light resources,meanwhile,much more soluble sugar is stored in leaves and stems to maintain their growth.
