杉木器管组织碳素含量变化特征

Changing characteristics of carbon content in Cunninghamia lanceolata organ tissues

在连续定位测定不同生长发育阶段杉木器管组织碳素含量的基础上,研究了不同生长发育阶段杉木器管碳素含量动态变化特征。结果表明：同一生长发育阶段,树叶的碳素含量（493.28～529.34 g.kg^-1）〉树皮（481.24～501.63 g.kg^-1）〉树根（473.25～483.61 g.kg^-1）〉树干（472.90～478.02 g.kg-1）〉树枝（468.37～477.14 g.kg^-1）,杉木根头的碳素含量〉大根〉粗根〉细根;不同器官之间碳素含量差异与器官的功能密切相关;不同生长发育阶段,20年生杉木器官的碳素含量〉18年生〉14年生〉11年生〉7年生,多年生叶或枝的碳素含量〉2年生〉1年生〉当年生;杉木器管组织碳素含量随林龄增大而增加,这与器管组织木质化程度提高有关。

Based on continuously measured organ carbon content of Chinese fir （Cunninghamia lanceolata） at different growing stages in National Field Station for Scientific Observation ＆ Experiment in Huitong County of Hunan province, the changing characteristics of organ carbon contents in Chinese fir at different growing stages were studied. The results show that the organ carbon contents in Chinese fir were ranked as follows： needle （493.28 ~ 529.34 g.kg^-1） 〉 bark （481.24 ~ 501.63 g.kg^-1） 〉 root（473.25 ~ 483.61 g.kg^-1） 〉 trunk （472.90 ~ 478.02g.kg^-1） 〉 twig （468.37 ~ 477.14 g.kg^-1）, and the carbon contents in roots decreased with decreasing roots＇ diameter, they ranked from big to small as： root head 〉 big roots 〉 coarse roots 〉 fine roots at the same growing stage; Carbon contents were closely related to the differences between different organs and organ functions; The carbon content in organs in Chinese fir at different growing stages ranked as： 20-year-old 〉 18-year-old 〉 14-year-old 3〉 ll-year-old 3〉 7-year-old, and the carbon contents ranked as perennial leaves or branches 〉 2-year-old 3〉 1-year-old 3〉 current-year-old; The findings showed that the organ tissues carbon contents in Chinese fir increased with increasing stand age, which is related to organs tissue lignification improvement.