关键词: 非结构性碳水化合物, 器官间变异, 种间变异, 木材孔性, 协同作用, 温带森林

Abstract: Abstract Aims Exploring the variations of non-structural carbohydrates among tree species and organs as well as the differences among tree functional groups, is an important topic to deeply understand the plant carbon allocation. Methods In this study, 32 tree species were selected from a typical conifer-broadleaf mixed forest in Laoyeling, Heilongjiang Province, and 8 organs were collected to systematically analyze the changes of NSC concentration with wood porous and organs. Important findings (1) The effect of organs on concentration of NSC and its components were greater than that of tree species. Among different organs, there was a gradual decrease from carbon source organs (leaf) and storage organs (bark and coarse root) to slow turnover organs (trunk and wood), and the sugar/starch ratio for particular tissue was highest in fast turnover organs (leaf and fine root). (2) There were no significant correlations between the concentrations of NSC and its components among the organs for most tree species, and there were no significant correlations between the concentrations of soluble sugar and starch in most organs. (3) The porosity of wood had a significant effect on the concentration of NSC and its components. From non-porous wood, porous wood to annular porous wood, the soluble sugar concentration in bark gradually decreased and the starch concentration in all organs except heartwood and the total NSC concentration in sapwood and belowground organs gradually increased. Transporting more NSC to non-photosynthetic organs and keeping of low concentrations of NSC particular soluble sugars in leaves is an important strategy to ensure adequate carbon supply of the whole tree. These results indicate the obvious functional differentiation of NSC storage in different organs of typical temperate forest tree species, and the significant effect of wood porosity on the concentrations of NSC and its components in multi-organs.

Key words: non-structural carbohydrates, inter-organ variation, inter-specific variation, wood porosity, coordination, temperate forest