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《Chinese Journal of Ecology》 2014-05
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Comparison of growth characteristics between 1-year-old seedlings of Quercus mongolica through seed germination and sprout regeneration

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;  
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.
【Fund】: 国家自然科学基金项目(31070556和31222012);; 森林与土壤生态国家重点实验室自主重大项目(LFSE2013-11)资助
【CateGory Index】: S792.186
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