摘要
【目的】研究树番茄幼苗在不同光照环境下碳(C)、氮(N)、磷(P)、钾(K)元素的积累和分配,为园林应用及林下种植提供理论依据。【方法】以一年生树番茄幼苗为研究对象,设置4种不同光照强度(100%、75%、50%、25%NR,NR为自然光照),观测树番茄幼苗生长发育形态参数,分析生物量、元素积累与分配格局。【结果】树番茄苗高、地径、各器官生物量基本随光照强度的减小先增后降,50%NR下最大,根冠比不断减小,全光照下根冠比最大;不同遮阴程度下树番茄幼苗各器官C含量相对稳定,叶和细根的N、P含量均有不同程度的增加,茎N、P含量有不同程度的降低。随光照程度的减弱,树番茄幼苗除粗根外,其余器官K含量均有不同程度的提高。不同处理各器官C、N、P、K积累量均为叶、茎中最大。随光照程度的减弱,树番茄幼苗地上部分C、N、P、K分配比例增加,地下部分分配比例减少。树番茄幼苗粗根C、N,细根N、P含量与各器官生物量、C、N、P、K含量无显著关系(P>0.05)。茎生物量与粗根生物量呈极显著正相关(P<0.01)。【结论】50%遮阴环境下,树番茄幼苗苗高、地径增长最大,同时增加对地上部分投入及减少对地下部分投入来适应低光环境。室外栽培、林下推广种植以及园林应用中可选择50%遮阴环境,有助于生物量、元素含量和积累量的增加。
【Objective】The study aims to investigate the accumulation and distribution of C,N,P,and K elements in Cyphomandra betacea Sendt seedlings under varying light environments,providing a theoretical basis for garden applications and understory planting.【Method】Four different light intensities(100%,75%,50%and 25%natural light,denoted as NR)were established to observe the morphological parameters of growth and development in C.betacea Sendt seedlings.Additionally,biomass,element accumulation,and distribution patterns were analyzed,with a focus on annual seedlings as the research subjects.【Result】The height,ground diameter,and biomass of C.betacea Sendt seedlings exhibited a general increase followed by a decrease with decreasing light intensity,reaching their maximum at 50%NR,while the root⁃to⁃crown ratio peaked under full light conditions.The C content in all organs remained relatively stable across different shade levels.However,the N and P contents in leaves and fine roots increased to varying degrees,while N and P contents in stems decreased.No⁃tably,with the decrease of light intensity,K content in all organs,except thick roots,showed varying increases.The highest accumulation of C,N,P and K occurred in leaves and stems under differnt treatments.The proportion of C,N,P and K in above⁃ground parts of C.betacea Sendt seedlings increased,while the proportion in underground parts decreased.No significant relationship(P>0.05)was observed between crude root C and N,fine root N and P content,and the biomass,C,N,P and K content of each organ.Stem biomass exhibited a highly significant positive correlation with coarse root biomass(P<0.01).【Conclusion】Under 50%shade,C.betacea Sendt seedlings exhibit optimal growth in height and diameter,demonstrating an increased allocation of resources to above⁃ground parts and a decreased invest⁃ment in below⁃ground parts to adapt to low⁃light conditions.The 50%shade environment proves advantageous for outdoor cultivation,extended planting in the forest,and garden applications,facilitating increased biomass,elemental content,and accumulation.
作者
李树萍
李世民
郭焕仙
孙丽娟
董琼
LI Shu-ping;LI Shi-min;GUO Huan-xian;SUN Li-juan;DONG Qiong(College of Forestry,Southwest Forestry University/Key Laboratory of State Forestry and Grassland Administration for Biodiversity Conserva-tion in Southwest China,Kunming 650224,China)
出处
《西南农业学报》
CSCD
北大核心
2024年第2期313-319,共7页
Southwest China Journal of Agricultural Sciences
基金
国家重点研发项目子课题(2017YFD0601202)
西南林业大学基金项目(2020YY013)
云南省“三区”科技人才支持计划项目(20200402)。
关键词
树番茄
光照
生物量
元素含量
化学计量特征
Cyphomandra betacea Sendt
Light
Biomass
Elemental content
Stoichiometric characteristics
