highly significantP < 0.01
ne and October, which were significantly different ( P < 0.05);The results of the source of variation analysis showed that the sampling time, organ and their interaction had a significant effect ( P < 0.05) on the variation of C content and N content of annual Ochroma lagopus seedlings; There was a highly significant positive correlation ( P < 0.01) between leaf P content and N content in annual Ochroma lagopus seedlings, and also a significant positive correlation ( P < 0.05) between leaf P content and root C content, and a significant negative correlation ( P < 0.05) between leaf N: P values and root N content; There were both anisotropic and isotropic growth relationships among the C, N, and P contents of different organs in Ochroma lagopus seedlings, with C-N, C-P, and N-P all showing anisotropic growth relationships in roots( P −1.0 <0.01) and isotropic growth relationships in leaves༈ P −1.0 >0.05༉.