不同龄林华山松非结构性碳水化合物季节变化

【目的】探究不同龄林华山松NSC及其组分随季节变化在各器官的分配，对于揭示不同龄林华山松的碳分配机制有重要意义。【方法】以幼、中龄林华山松为研究对象，通过周期性采样，测定不同龄林华山松不同器官NSC及其组分含量，以探究其年内季节动态变化。【结论】结果表明：（1）不同龄林华山松植株NSC及其组分在各器官间的分配规律基本一致，表现为淀粉含量根>叶>枝>茎，茎中淀粉含量显著低于其他器官，可溶性糖和NSC在叶、根、枝中含量差异不明显；茎中糖淀比显著低于其他器官。（2）在整个生长季内，华山松NSC及其组分主要受季节影响，季节×器官间交互作用对它们的影响次之，林龄对它们的影响最小。（3）在不同龄林中各器官NSC及其组分之间的相关性基本一致，除幼龄林糖淀比与淀粉、NSC，中龄林糖淀比与淀粉为负相关外，其余指标之间为正相关。【结果】综上所述，华山松各器官NSC及其组分含量存在明显的季节波动，当环境变化时不同器官间的碳供需协同变化，有利于华山松生长，并增强其应对极端环境的抵抗力和适应性。

Seasonal variations in non-structural carbohydrate of differently aged Pinus armandii Plantations

【Objective】 It is of great significance to explore the distribution of NSC and its components in different organs with seasonal changes for revealing the mechanism of carbon distribution in different age forests. 【Methods】 The contents of NSC and its components in different organs of young and middle-aged Pinus armandii were determined by periodic sampling to explore the seasonal changes of P. armandii during the year. 【Results】 The results showed that, (1) the distribution pattern of NSC and its components in different age forests was basically the same among all organs, with the starch content in roots > leaves > branches > stems. The starch content in stems was significantly lower 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 stem was significantly lower than that in other organs. (2) During the whole growing season, NSC and its components were mainly affected by seasons, followed by the interaction between seasons and organs, and the influence of forest age was the least. (3) The correlation between NSC and its components in different forest organs was basically the same, except the negative correlation between young forest ratio of sugar to starch and starch, NSC and middle-aged forest ratio of sugar to starch and starch, the other indexes were positively correlated. 【Conclusion】 In summary, NSC and its component contents in various organs of P. armandii had obvious seasonal fluctuations. When the environment changes, 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.