浙江天童常绿阔叶林内七种优势植物的热值研究

Caloric Values of Seven Dominant Species in Tiantong National Forest Park,Zhejiang Province,China

对浙江天童国家森林公园亚热带常绿阔叶林中的3种乔木优势种和4种灌木优势种地上部分器官的灰分含量及热值进行了测定.结果表明3种乔木植物的干重热值和去灰分热值由大到小的顺序均为木荷>米槠>栲树;这3种植物在不同的发育阶段中,均为成株的干重热值和去灰分热值最大,3种植物在幼苗和幼树阶段时的干重热值和去灰分热值也均高于灌木植物种的干重热值和去灰分热值;而且,3种乔木树种地上部分的平均干重热值和平均去灰分热值均大于灌木种类,这可能与常绿阔叶林群落内光照强度的递减有关.在同种植物不同器官之间,一般都以叶的干重热值和去灰分热值最大,枝或干皮最小.

The ash contents and caloric values of different aboveground organs for three domi- nant tree species and four dominant shrub species in the east subtropical evergreen broad-leaved forest in Tiantong National Forest Park（TNFP）, Zhejiang Province were studied in the paper. The results showed that the gross caloric values （GCV）and the ash-free caloric values（AFCV） of various aboveground organs are different among dominant species, the GCV and AFCV of three dominant tree species can be ranked in a decreasing order as Schima superba〉Castanopsis carlesii〉 C. fargesii, and their GCV and AFCV during mature trees are the biggest among the different developmental phases. Meanwhile the GCV and AFCV of the three tree species during the saplings and seedlings are higher than those of shrub species too. GCV and AFCV of the same organ in different aboveground layers decreased from tree species to shrub species, therefore it suggested that the caloric values are closely related to the light gradient within the community. For the same species, the caloric values altered greatly among different organs, the GCV and AFCV of leaves are higher than those of branch and bark. The paper also showed that the gross caloric values are affected obviously by the ash contents.