Liu Qing Qing, Ma Xiang Qing, Li Yan Juan, Zhuang Zheng, Du Zi Long, Xing Xian Shuang, Liu Bo
College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Engineering Research Center of Chinese Fir, State Forestry Administration, Fuzhou 350002, China.
Ying Yong Sheng Tai Xue Bao. 2016 Dec;27(12):3845-3852. doi: 10.13287/j.1001-9332.201612.034.
The effect of light intensity on the seed germination and seedling growth of Chinese fir under different light intensities (100%, 40%, 20%, 10%, 5% of full light, and the PPFD was 201.3, 77.0, 37.5, 19.2, 9.8 μmol·m·s, respectively) was investigated, and the adaptive strategy of seed germination, seedling survival, growth, morphological plasticity, biomass accumulation and allocation under different light intensities was explored in this paper. The results showed that light intensity significantly affected the germination rate, survival rate, establishment rate and germination index. Germination rate reached the maximum under 40% light intensity, while survival rate and establishment rate reached the maximum at 100% light intensity. With the light intensity decreased, the stem length increased, while the root length, cotyledon length, cotyledon thickness and euphylla number declined, and basal stem diameter had no significant difference among diffe-rent light intensities. The total biomass, root biomass, stem biomass and leaf biomass were the highest under 100% light intensity. With the light intensity decreased, the photosynthesis non-photosynthesis biomass ratio and leaf biomass ratio declined, while stem biomass ratio increased, the root to shoot ratio and root biomass ratio had no significant difference among different light intensities. Low light promoted seed germination, but seedlings grew slowly with high mortality under low light. The accumulation of biomass in stem increased the plant tolerance to low light.
研究了不同光照强度（全光照的100%、40%、20%、10%、5%，对应的光合光子通量密度分别为201.3、77.0、37.5、19.2、9.8 μmol·m·s）对杉木种子萌发和幼苗生长的影响，探讨了杉木在不同光照强度下种子萌发、幼苗存活、生长、形态可塑性、生物量积累与分配的适应策略。结果表明，光照强度显著影响发芽率、成活率、成苗率和发芽指数。发芽率在光照强度为40%时达到最高，而成活率和成苗率在光照强度为100%时达到最高。随着光照强度降低，茎长增加，而根长、子叶长度、子叶厚度和真叶数量减少，不同光照强度下基茎直径无显著差异。总生物量、根生物量、茎生物量和叶生物量在光照强度为100%时最高。随着光照强度降低，光合与非光合生物量比及叶生物量比下降，而茎生物量比增加，不同光照强度下根冠比和根生物量比无显著差异。弱光促进种子萌发，但幼苗在弱光下生长缓慢且死亡率高。茎中生物量的积累增加了植株对弱光的耐受性。
