Nutrient Content and Distribution Characteristics in Organs of Torreya grandis‘Merrillii’at near Maturity of Seed

In August 2021, 3 sample trees of 20-, 100- and 500-year Torreya grandis‘Merrillii’ were selected in Zhuji of Zhejiang province to collected roots, stems, leaves and seeds and soil. The results showed that average content of total organic carbon (TOC) in different organs was 448.49 g·kg-1, ordered by seed> leaf> stem> root. The content of TOC in seeds was significantly higher than that in other organs (P<0.05). There was a significant difference in the content of TOC in stems among different tree ages (P<0.05), but no in other organs among different tree ages (P>0.05). The average content of TN, TP, TK in different organs were 21.48, 2.85, 14.55 g/kg, respectively. 20-year T. grandis‘Merrillii’had the order of TN content as follows, leaf > seed> root > stem, that of TP content was seed > stem >leaf > root, that of TK content was seed> root > stem > leaf. 100-and 500-year trees had the order of TN content, seed> leaf > root > stem, of TP content, seed> root > stem > leaf, of TK, seed> leaf> stem> root. Organs had significant effects on TOC, TN, TP and TK contents (P<0.05), age had significant effect on TOC content (P<0.05), but had no significant effect on TN, TP and TK content (P>0.05). The average Ca and Mg content in different organs of T. grandis‘Merrillii’was 11.70 and 2.27g/kg. The order of Ca content was leaf > stem > root > seed, and there was no significant difference of Ca content among the same organs of different aged trees. There were significant differences in Mg content among different tree ages and organs. It had evident or extremely evident relation of nutrient content in organs with soil nutrient, but nutrient content in seeds had no significant relationship with soil nutrients. The total nutrient contents in different organs of near mature of T. grandis‘Merrillii’were ordered by TOC>TN>Ca>TP>Mg>TK, the highest was in the seed.