Light-induced elemental accumulation and distribution of C,N,P and K in Cyphomandra betacea Sendt seedlings
[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.beta-cea Sendt seedlings increased,while the proportion in underground parts decreased.No significant relationship(P＞0.05)was observed be-tween 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 ex-hibit 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,ex-tended planting in the forest,and garden applications,facilitating increased biomass,elemental content,and accumulation.
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