Seasonal variations of non-structural carbohydrates of young and middle-age Pinus armandii plantations
[Objective]It is of great significance to explore the distribution of NSC(non-structural carbohy-drate)and their components in different organs with seasonal changes for revealing the mechanism of car bon distribution in different age Pinus armandii.[Methods]The contents of NSC and their components in different organs of young and middle-aged P.armandii were determined by periodic sampling to explore the seasonal changes of P.armandii during the year.[Results](1)The distribution pattern of NSC and their components in different age P.armandii was the same among all organs,where the starch content was in the order:Roots＞leaves＞branches＞stems.The starch content in stems was significantly low-er than that in other organs,while the content of soluble sugar and NSC in leaves,roots and branches was not significantly different.The ratio of sugar to starch in stems was significantly higher than that in other organs.(2)During the growing season,NSC and their components were mainly affected by seasons,fol-lowed by the interaction between seasons and organs,and the influence of forest age was the least.(3)The correlation between NSC and their components in different P.armandii organs was the same.Except the negative correlation between the ratio of sugar to starch and starch,NSC in young-aged P.armandii and the ratio of sugar to starch and starch in middle-aged P.armandii,the other indexes were positively correlated.[Conclusion]NSC and their components in various organs of P.armandii had obvious season-al fluctuations.When the environment changed,the carbon supply and demand of different organs changed synergistically,which was conducive to the growth of P.armandii,and enhanced its resistance and adaptability to cope with extreme environment.
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