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采用干烧法对南亚热带6个树种人工林不同器官及生物组分进行碳素密度测定。结果表明:树木不同器官之间碳素密度不同,所测6个树种中以树叶和树干最高,其次为树枝,树根和干皮最低;树种之间以马尾松碳素密度最高,米老排、红椎等阔叶树种较低。林下灌木不同器官间碳素密度差异显著,其规律与乔木类似,以叶和枝碳素密度最高,根最低;林分间随着林分密度增加,林下灌木碳素密度呈下降趋势。林下草本碳素密度的分布规律是地上部分大于地下部分;不同林分间碳素密度变化规律与灌木相似。由未分解、半分解到完全分解,地表凋落物碳素密度快速下降。林分内不同生物组分之间,碳素密度从高到低依次为乔木>灌木>草本>地表凋落物。
The dry matter method was used to determine the carbon density of different organs and biological components of six tree species plantations in the southern subtropics. The results showed that: the density of carbon among different organs of trees was different. Among the six tested trees, the highest was the leaves and the trunk, the second was the branches, the lowest was the root and the dry skin. The density of Pinus massoniana among the trees was the highest, , Redwood and other broadleaf species lower. The density of carbon among different organs of understory shrubs was significantly different, and its regularity was similar to that of arbors, with the highest density of leaf and branch carbon and the lowest of roots. With the increase of stand density, the carbon density of understory shrubs decreased. The distribution law of understory herb carbon density is that the aboveground part is larger than the underground part; the variation law of carbon density between different forest stands is similar to shrubs. From undecomposed, semi-decomposed to completely decomposed, the surface litter carbon density decreased rapidly. Among the different bio-components in the stands, the carbon densities from high to low were arbor> shrub> herb> litter.