热带地区木麻黄无性系生物量及其空间分配特征

Biomass of Casuarina Clones and Its Spatial Distribution Characteristics in Tropical Region

选择不同径阶的木麻黄无性系标准木各3株作为生物量及其空间分配特征研究对象,研究结果表明:不同径阶木麻黄无性系地上部分平均生物量占全株生物量的70.82%,地下部分占29.18%,这说明地上部分生产量高;各器官生物量分配以树干最大,果最小,表明树干是该树种的主要组成部分,且随着林龄的增加,树干生物量分配比例有增加趋势;相反,树枝、树叶、果生物量分配比例逐级降低。不同径阶木麻黄地上(干、枝、叶、果)和地下(根系)生物量的空间分配比例均约为4∶1,说明该树种地上、地下两部分分配比例遵循一定的生长规律,受木麻黄生长的影响较小。

The biomass and its spatial for three Cazuarina plants with different diameters were studied. The resuhs showed that the biomass was mainly concentrated in the aerial part, accounting for 70.82% of the whole plant biomass; The biomass for the trunk was the largest and that of the fruit was the least. The increasing stand age could lead to significant increase of the proportion of stem biomass, but lead to significant biomass reduction of branches, leaves and fruits; The spatial distribution ratio of the ground parts（trunk, branches, leaves, fruit）and the underground（root）was about 4：1, meaning the mass distribution ratio was less affected by the growth of Casuarina.