尖峰岭热带山地雨林主要神类能量背景值测定分析

CALORIC VALUES OF MAIN SPECIES IN A TROPICAL MOUNTAIN RAIN FOREST AT JIANFENGLING, HAINAN ISLAND

本文报道了海南岛尖峰岭热带山地雨林主要树种６７种、灌木及大型木质藤本植物１６种的各器官的热值。结果表明，热带森林主要种类的热值差异甚大，即使相同属内的一些种类，均具有明显的差异，这种差异与植物种的生物学特性有关，即在生活型的分类系统中，芽位越高的植物其热值越高，但在同一树种中，不同个体大小的植株，其差异不明显；不同植物种的根系热值也差异不大。一般情况下，树叶的热值较大，树干、树皮、树枝和根系次之。已初步证明了部分热带植物含有较多的硅、锰、铁、钙等元素，它们在样品燃烧后形成了颗粒状的剩余物，这是一个值得更深入探讨的新问题。

The caloric values (containing ash) of main plant species in a tropical mountain rain forest at Jianfengling, Hainan Island of China were measured by sampling 67 tree species, 10 shrubs and 6 lianas. The results indicated that the caloric values for tree species were generally bigher, and the values of the leaf, stem, branch, bark, root and the plank-buttress were 20470.2,19523.2, 19401.2 19325.0, 19250.4 and 19454.5J/g respectively according to average values of 67 tree species. Caloric values for shrubs were lower than trees',the values for the leaf, shoot and root being only 18566.4, 18730.1 and 18530.4J/g respectively. Woody lianas had higher caloric values than herbal lianas. There were significant difference in caloric values among different species. Generally speaking, the megaphanerophyte plants had higher caloric values than nanophanerophyte plants. It is clear that the values were related to the plant life-form. Different individuals of the same species were not obviously different in caloric values. It was initially proved that some tropical plants contained certain amounts of elements such as Si, Fe, Mn, Mg,Cu, Ca,and Zn. indicating that tropical plants possessed a particular bio-geochemical cycling pattern. These elements could form oxides after plants being burned,therefore, this problem should be further studied in the future.