不同世代杉木优树幼苗生长、生物量积累及磷效率比较OA

To explore the differences in growth performance,biomass accumulation,phosphorus absorption,and phosphorus utilization efficiency among seedlings of different generations of superior Chinese fir(Cun-ninghamia lanceolata),this study selected superior trees of provenance(STP),first-generation superior trees(FST),and second-generation superior tree(SST)populations from the national Chinese fir germ-plasm bank located at the Subtropical Forestry Experimental Center of the Chinese Academy of Forestry.The study measured the height ground diameter,biomass accumulation and allocation,root morphology,phosphorus absorption efficiency,and phosphorus utilization efficiency of the seedlings of its pro-geny,and analyzed the correlations between these indices.The results indicated that there were no significant differ-ences in seedling height,diameter at ground height,and total biomass between the source superior trees and second-generation superior tree populations,both of which were significantly higher than the first-genera-tion superior tree population;however,the root-to-shoot ratio exhibited the opposite trend.There were no significant differences in root length,root surface area,root volume,root tip number,specific root length,and root tissue density among different generations.Apart from the root phosphorus absorption efficiency,the phosphorus absorption efficiency of superior trees of provenance was generally comparable to that of second-generation superior trees,but their phosphorus utilization efficiency was significantly higher.The correlations among growth,root indicators,biomass,phosphorus absorption efficiency,and phosphorus uti-lization efficiency in different generations of superior tree populations were not completely consistent.The superior trees of provenance population and second-generation superior tree shows great potential for iden-tifying breeding materials with high growth rates and phosphorus efficiency,providing scientific support for future explorations of Chinese fir germplasm resources.