应用生态学报2017，Vol.28Issue(5)：1473-1481,9.DOI:10.13287/j.1001-9332.201705.017
香果树实生苗的光合特性及其与环境因子的关系
Photosynthetic characteristics of Emmenopterys henryi seedlings and their relationships with environmental factors
摘要
Abstract
To find appropriate environment for Emmenopterys henryi seedlings and develop corresponding strategies for their natural regeneration,the net photosynthetic rate,water use efficiency,chlorophyll content,height,basal diameter and biomass of two-year old seedlings and the relationships with environmental factors were studied in different habitats,i.e.,undercanopy,crown edge,forest gap,and forest edge.In the four habitats,the maximum photosynthetically active radiation (PAR) was 50-1380 p mol · m-2 · s-1,net photosynthetic rate of E.henryi seedlings showed singlet diurnal variation in undercanopy and crown edge,and showed a bimodal pattern in forest gap and forest edge.Seedlings were shade-tolerant plants with the low shade-tolerant ability.The order of light saturation point,light compensation point,and dark respiration of their functional leaves in different habitats was the same as follows:forest edge ＞ forest gap ＞ crown edge ＞ undercanopy,and the order was inverse when sequenced by apparent quantum efficiency.Seedlings were highly adaptable to forest gap and crown edge,with higher transpiration rate,stomatal conductance,water use efficiency (WUE),and net photosynthetic rate.Seedlings in forest gap had lower leaf chlorophyll content,but they grew fast and therefore showed the maximum biomass.Net photosynthetic rate of the seedlings showed significant positive correlation with PAR and stomatal conductance.For undercanopy,seedling photosynthesis was facilitated by reducing canopy density and increasing light transmittance.For forest edge,vegetation cover should be increased with reducing light intensity to ensure rapid growth of the seedlings.关键词
光合特性/水分利用效率/叶绿素含量/实生苗/自然更新Key words
photosynthetic characteristics/water use efficiency/chlorophyll content/seedling/natural regeneration引用本文复制引用
郭连金,杜佳朋,吴艳萍,肖志鹏,廖婷,邵秀娟..香果树实生苗的光合特性及其与环境因子的关系[J].应用生态学报,2017,28(5):1473-1481,9.基金项目
本文由国家自然科学基金项目(31360145)资助 This work was supported by the National Natural Science Foundation of China (31360145). （31360145）
