热带亚热带植物学报2024，Vol.32Issue(1)：27-36,10.DOI:10.11926/jtsb.4744
混交比例对桉树-乡土树种混交林优势树种叶片资源获取性状的影响
Effect of Mixed Proportions on Leaf Resource Acquisition Capability in Mixed Plantations of Eucalyptus and Native Trees
摘要
Abstract
Mixed-species plantations composed of Eucalyptus and native tree species have great potential in improving stand productivity and ecosystem functions.In this study,we investigated leaf physiological,structural and chemical traits of three dominant native tree species(Machilus chinensis,Cinnamomum burmannii and Manglietia glauca)and Eucalyptus urophylla in Eucalyptus monocultures(EM)and four mixtures of Eucalyptus(EU)and native trees species(NS)with different mixed proportions(EU:NS=5∶5,6∶4,7∶3,8∶2,respectively)in south China.The results showed that there was substantial interspecific variation in leaf traits among four dominant tree species.On average,M.glauca had the highest SLA,PPUE,Amass,Tmass,Nmass and Pmass,indicating that M.glauca adopts resource acquisition strategies.E.urophylla had the lowest SLA,PPUE,Amass,Tmass,Nmass,Pmass but the highest PNUE,indicating that E.urophylla occupies characteristics typical of fast-growing and nutrient-conserving in order to adapt nutrient-poor environments.There was nearly no overlap between M.glauca and E.urophylla in leaf traits,such as SLA,N∶P,Amass,Tmass,PPUE and Nmass,indicating that M.glauca and E.urophylla were highly complementary in the leaf resource use.Manglietia glauca may be an ideal candidate tree species for establishing mixed plantations of Eucalyptus and native tree species.At the species level,Nmass of M.glauca,Pmass of M.chinensis,Amass and PPUE of C.burmannii in dry season increased with the mixed proportion of native species,but leaf traits of four dominant tree species were generally not affected by the mixed proportion as a whole.At the stand level,SLA,PPUE,Amass,Tmass and N∶P in mixtures of Eucalyptus and native species were significantly higher than those in Eucalyptus monocultures.Thus,plantations established with Eucalyptus and high diversity native tree species can improve the light capture and photosynthetic capability from the stand level,but also aggravate the phosphorus limitation of plant growth.Overall,it was suggested that native species with complementary resource use to Eucalyptus and capability of optimizing phosphorus biogeochemical cycle of mixed plantations should be prioritized in designing and improving the Eucalyptus plantations in south China.关键词
桉树/乡土树种/混交林/混交比例/叶片性状Key words
Eucalyptus/Native species/Mixed forest/Mixed proportion/Leaf trait引用本文复制引用
龙靖,何小芳,陆宏芳,刘楠,林永标,杨龙,王俊..混交比例对桉树-乡土树种混交林优势树种叶片资源获取性状的影响[J].热带亚热带植物学报,2024,32(1):27-36,10.基金项目
广东省重点领域研发计划项目(2020B1111530004) （2020B1111530004）
中国科学院青年创新促进会会员项目(2019340) （2019340）
国家自然科学基金项目(31770473) （31770473）
广东省林业科技创新项目(2022KJCX003)资助This work was supported by the Program for Key Research and Development in Guangdong(Grant No.2020B1111530004),the Project of Youth Innovation Promotion Association,Chinese Academy of Science(Grant No.2019340),the National Natural Science Foundation of China(Grant No.31770473),and the Project for Forestry Science and Technology Innovation in Guangdong(Grant No.2022KJCX003). （2022KJCX003）
