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为探讨辽东栎苗木早期生长与光的关系 ,在苗圃设置了 4种人工控制下的光照强度 (1 0 0 % ,5 0 % ,30 % ,4% ) .对苗木在不同的光照条件下的出苗率、苗高生长、苗木地径、净光合效率等进行了测定 .结果表明 ,全重种子的保存率高达 30 %～ 6 0 % ,而 1 /3,1 /2重处理的保存率为 1 %～ 43.3% ,低于全重种子 .光强对根的生长有很大的影响 .苗木的各项指标在全重 (对照 )区 ,随着光照强度的减弱而减少 ,而且在同一光照区 ,全重 (对照 )大于 1 /2 ,1 /3重处理的苗木 .辽东栎苗木在光照强度 5 0 %的条件下生长较好 ,相对光照强度小于 30 %时 ,其生长状况显著降低 .辽东栎属于阳性树种 ,从本实验的结果来看 ,虫兽害对种子的危害不是影响天然更新的主要因子 ,林内光照不足 ,对辽东栎幼苗的生长起主要限制作用
In order to investigate the relationship between early growth and light of Quercus liaotungensis seedlings, four light intensities (100%, 50%, 30%, 4%) under artificial control were set up in nursery. Germination rate, seedling height growth, seedling diameter, net photosynthetic efficiency, etc. The results showed that the preservation rate of whole heavy seeds was as high as 30% ~ 60%, while the preservation rate of 1 / 3,1 / 2 treatment was 1% -43.3%, lower than that of the whole seeds.The light intensity had a great influence on the growth of the roots.The indexes of the seedlings decreased in the whole weight (control) area with the decrease of light intensity, (Control)> 1/2, 1/3 reprocessing seedlings.The growth of Quercus liaotungensis seedlings under the condition of 50% light intensity was better, and the relative light intensity was less than 30%, the growth of seedlings was significantly reduced. Quercus liaotungensis is a positive tree species. According to the results of this experiment, the harm of insect pests to the seeds is not the main factor affecting the natural regeneration. The light in the forest is not sufficient and plays a key role in the growth of Quercus liaotungensis seedlings