山西农业大学学报（自然科学版）2024，Vol.44Issue(1)：61-69,9.DOI:10.13842/j.cnki.issn1671-8151.202309021
不同光强下琼岛杨幼苗生长和光合特性
Growth and photosynthetic characteristics of Populus qiongdaoensis seedlings under different light in-tensities
摘要
Abstract
[Objective]This study aimed to explore the effects of different light intensities on the growth and photosynthetic char-acteristics of Populus qiongdaoensis seedlings.[Methods]One and a half-year-old P.qiongdaoensis seedlings were used as ex-perimental materials.Four light intensity treatments were set up:full light(100%,CK),70% full light(RI70%),40% full light(RI40%),and 10% full light(RI10%).After 12 months of treatment,the effects of different light intensities on the growth and photosynthetic characteristics of P.qiongdaoensis seedlings were analyzed.[Results]Survival rate,ground diame-ter growth,leaf number growth,leaf length,leaf width,leaf area,and single leaf mass all decreased with the reduction of light intensity.Stem height growth and leaf number showed an initial increase followed by a decrease trend.The survival rate,stem height,ground diameter,and leaf number of P.qiongdaoensis seedlings under RI70% and RI40% treatments were significant-ly higher than those under RI10% .The root biomass,root biomass ratio,and root-to-shoot ratio of RI70% treatment were sig-nificantly higher than those of RI40% and RI10% .RI70% and RI40% treatments resulted in significantly higher root,stem,leaf biomass,and total biomass compared to RI10% .With decreasing light intensity,leaf content of chlorophyll a,chlorophyll b,and total chlorophyll content gradually increased,while the content of carotenoids decreased.Pn significantly decreased with the decrease of light intensity.Under RI70%,P.qiongdaoensis sseedlings exhibited the highest Pn,which was 1.72 times and 2.16 times higher than those under RI40% and RI10%,respectively.Leaf number growth was significantly positively cor-related with stem height growth and ground diameter.Pn was significantly positively correlated with carotenoid(Car)and tran-spiration rate(Tr).Stomatal limitation value(Ls)was significantly negatively correlated with Ci and GS.[Conclusion]P.qiong-daoensis seedlings can tolerate a certain degree of shade,and moderate shading can promote the growth of both aboveground and underground parts of seedlings which enhancing their gas exchange capacity.However,seedlings face challenges in surviv-al and growth under weak light stress.Relative light intensity of 70% appears to be the most adaptive for P.qiongdaoensis seedlings.关键词
琼岛杨/幼苗/光照强度/光合特性Key words
Populus qiongdaoensis/Seedling/Light intensity/Photosynthetic characteristics分类
农业科技引用本文复制引用
饶丹丹,韩豫,吴二焕,陈彧..不同光强下琼岛杨幼苗生长和光合特性[J].山西农业大学学报（自然科学版）,2024,44(1):61-69,9.基金项目
海南省自然科学基金项目(321QN366) （321QN366）
