Abstract:

The investigation of nutrient contents of 39 common species was carried out in Tiantong National Forest Park. The results reveal that the leaf N contents of evergreen-broad leaved trees range from 1.059% to 2.896%，P contents range from 0.069% to 0.126%， the leaf N contents of deciduous-broad leaved trees range from 1.868% to 3.254%, and P contents range from 0.092% to 0.186%. The leaf N contents of coniferous tree Pinus massoniana is 1.874% (N), and the P contents of 0.078％. Average nutrient contents in all organs are different， average nutrient contents in stem and root are lower, and the leave are highest among organs. N and P contents are closely correlated in different organs. Deciduous broad-leaved species have consistently higher leaf N and P than evergreen broad-leaved species, but there are no significant differences in stems, branches and roots. The nutrient contents of trees are higher than shrubs among evergreen broad-leaved species. According to nutrient contents,the common and dominant species in different succession stages can be classified into three groups,nanmely, the rapid growth strategy group, the nutrient retention strategy group and the other group.In addition, there is a correlated relationship between N and P contents in different organs and the correlation cofficient is in the order: leaf>stem>branch>root.The positive relationship between N and P for the need of different organs is also observed.

Key words: sapling, nutrient status, common species, sapling, nutrient status