摘要
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 。
In order to inquire into the relationship between the early growth of Quercus liaotungensis and light, by using green wire entanglement shading we set up four illumination intensity(e.g.100%, 50%, 30%, and 4% of full light)to study the rate of emergence of seedlings, the height growth of nursery stock, the diameter near the earth's surface of nursery stock, net photosynthesis, transpiration, the obstruction of stoma and the utilization ratio of moisture under different illumination intensity. The results show that the young plant of Quercus liaotungensis is not suited to grow under full light, but it is suited to grow under 50% of full light. Under 50% of full light, the rate of emergence of seedlings is the highest. In addition, under this condition, the fastest growth on height and the diameter near the earth's surface of Quercus liaotungensis are achieved. At the same times net photosynthesis, transpiration, and the utilization ratio of moisture are all effective. Quercus liaotungensis can grow under 30% and 4% of full light. So a conclusion is drawn that the proper shading is required during the early growth of the young plant of Quercus liaotungensis although Quercus liaotungensis is light\|demeter
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2000年第4期97-100,共4页
Journal of Beijing Forestry University
基金
北京林业大学太岳山生态定位站研究项目
关键词
辽东栎
光照强度
出苗率
苗木生长
Quercus liaotungensis , light intensity, rate of emergence of seedlings, growth of seedlings
