老龄橡胶树不同器官含碳率分析

Analysis on the Carbon Content of Different Organs of Rubber tree(Hevea brasiliensis) in Regeneration Priod

采用收获法测定与分析30 a老龄橡胶树不同器官含碳率。结果表明:(1)橡胶林地上部分各器官含碳率依次为:树叶(52.90%)>树干(48.84%)>侧枝(47.46%)>树皮(46.20%)>嫩枝(45.20%),其中树叶含碳率显著高于其它器官;橡胶林地面部分凋落物各组分的含碳率大小为,落果(55.30%)>落叶(53.22%)>落花(51.25%)>枯枝(47.81%),且各组分含碳率两两之间差异显著,橡胶树相同组分枯样的含碳率大于鲜样;(2)橡胶林地下部分不同直径根系含碳率依次为:大根(49.40%)>细根(49.16%)>粗根(49.08%)>根桩(48.65%)>小根(47.37%)>中根(46.94%);(3)橡胶树主要器官占单株的总含碳率分别为:树叶占21.79%、树干占20.12%、树根19.96%、树枝占19.09%、树皮占19.13%。更新期橡胶树单株的平均含碳率为48.55%。

By means of the harvesting method, we studied the carbon content in different organs of rubber trees （Hevea brasiliensis） in regeneration period. The results showed that the carbon content of aboveground organs of rubber trees decreased in the order： leaves （52.90%） 〉trunks （48.84%） 〉collaterals （47.46%） 〉barks （46.20%） 〉twigs （45.20%）. The carbon content of leaves was significantly higher than those of other organs. The carbon content of different components of litter in rubber plantation decreased as the following order： fruits （55.30%）〉deciduous （53.22%〉flowers（51.25%）〉deadwoods（47.81%）, and with significant differences between any two components. The content of the withering sample of same kind of component was greater than that of fresh litter. The carbon content of roots with different diameters of rubber trees decreased as the order： large roots（49.40%）〉fine roots （49.16%）〉coarse roots（49.08%）〉stump-roots（48.65%）〉small roots（47.37%）〉medium roots（46.94%）. The total carbon rates of main organs accounting for whole rubber trees were leaves 21.79%, trunks 20.12%, roots 9.96%, branches 19.09% and barks 19.13%, respectively. The average carbon content of the rubber tree in regeneration was 48.55%.