西北林学院学报2024，Vol.39Issue(5)：168-175,8.DOI:10.3969/j.issn.1001-7461.2024.05.21
光竞争对杉木幼苗生长、生物量分配及叶片化学计量特征的影响
Effects of Light Competition on the Growth,Biomass Allocation and Leaf Stoichiometry Characteristics of Chinese Fir Seedlings
摘要
Abstract
The present study aimed to investigate the influences of light competition on the growth charac-teristics of Chinese fir(Cunninghamia lanceolata)seedlings,as well as the response strategies of leaf C,N,and P stoichiometry to gain a deeper understanding of the nutrient utilization and growth adaptability of Chinese fir leaves in a light competition environment.Seedlings of Chinese fir clone with uniform growth status were selected as research objects.Indoor pot experiment was adopted.BY artificially adjusting the height difference of adjacent potted containers,a simulated light competition environment between the seedlings were created to form the dominant seedlings and their neighboring competing seedlings character-ized by obvious competitive advantages in light resources.Three light competition intensities were set based on the pot height difference intensive light competition(height difference 0 cm),moderate light com-petition(height difference 8 cm),and mild light competition(height difference 16 cm).After one year of measuring and analyzing the light competition simulation treatment,the seedling height and ground diame-ter of the participating seedlings were tested.The study analyzed the differences in the biomass of various organs and the content of C,N,and P of leaves,as well as the characteristics of the stoichiometric ratio be-tween the elements.As the light competition intensity decreased,the height of competing seedlings in-creased by 6.04％compared to dominant wood,while the ground diameter decreased by 17.51％.The root-to-head ratio and root biomass allocation ratio also increased to 40.0％.Additionally,the N content of the leaves in competing seedlings increased to 21.63 g/kg.On the other hand,the C and P contents of domi-nant seedling leaves decreased and then increased with a decrease in light competition intensity,which was significantly greater than that of competing wood(P＜0.05).The C/N and C/P of dominant seedlings in-creased firstly and then decreased,while the C/P of competing seedlings increased with the decrease of light competition intensity.Furthermore,the dominant seedling leaf biomass had a correlation with P content,while the competing seedling stem biomass was correlated with both leaf biomass and P content.Chinese fir seedlings exhibit varying growth and leaf stoichiometry characteristics depending on their position in re-lation to light resource competition.Their adaptations differ according to the intensity of the light competi-tion.When faced with reduce light competition,the seedlings increase their competitive intensity and dis-tribute their biomass mostly to underground roots,resulting in a"slender height"morphology.As light competition intensity increases,the biomass distribution shifts towards the leaves,decreased biomass accu-mulation,and decreased C and P content,leading to a"dwarf and coarse"morphology.关键词
光资源竞争/杉木/生态化学计量学/生长特性/根冠比Key words
light competition/Chinese fir/stoichiometry/growth characteristics/root-shoot raito分类
农业科技引用本文复制引用
黄健,吴凯,Muhammad Ahtesham Aslam,黄勇来,马祥庆,吴鹏飞..光竞争对杉木幼苗生长、生物量分配及叶片化学计量特征的影响[J].西北林学院学报,2024,39(5):168-175,8.基金项目
国家重点研发计划项目子课题(2021YFD2201304-05) （2021YFD2201304-05）
福建省林业科技项目(2023FKJ09). （2023FKJ09）
