Seasonal Dynamics of Leaf Nonstructural Carbohydrate Content in Four Temperate Tree Species
To determine the effect of tree species and leaf age on the seasonal dynamics of leaf soluble sugar, starch and total nonstructural carbohydrate , we quantified nonstructural carbohydrate and its component concentrations monthly of current-year leaf (needle) of Picea koraiensis, Larix gmelinii, Fraxinus mandshurica, Phellodendron amurense, and one-year-old needle of P.koraiensis in pure plantation during one growing season.There is large discrepancy in the seasonal pattern of nonstructural carbohydrate between P.koraiensis and other tree species.There is large variation in monthly soluble sugar content (1.0%-95.5%), but small in starch content (2.7%-30.5%) except for P.koraiensis.The seasonal dynamic of the total nonstructural carbohydrate content across tree species is similar to starch.Total leaf nonstructural carbohydrate content has no correlation with soluble sugar and starch in P.amurense ( P>0.05) , but positive correlation with starch in the other tree species (P<0.05).By two-way ANOVA, tree species significantly affects the contents of total nonstructural carbohydrate, soluble sugar and starch (P<0.05), but sampling time only significantly influences the soluble sugar con-tent (P=0.017), and their interaction has markedly influence on soluble sugar and starch concentration (P<0.05). There is distinct difference in the seasonal dynamics of nonstructural carbohydrate and its components between current-year and one-year-old needle of P.koraiensis, and one-year-old needle always has larger soluble sugar content than that in cur-rent-year needle except in October .
NETL
NSTL
万方数据
维普
