Caloric values of dominant species in the different layers of lower subtropical monsoon evergreen broad-leaved forest at Dinghushan Mountain
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摘要: 探讨鼎湖山南亚热带季风常绿阔叶林不同层次优势植物热值一般规律，可为该群落能量特征和生态效率研究提供基础资料和科学依据.2002年用PARR1281型氧弹热值仪测定了该群落不同层次21种优势植物不同器官（部位）热值.结果表明，季风常绿阔叶林各优势种的平均干重热值在1592～1966kJg间，乔木1层干重热值以厚壳桂最高，乌榄最低；乔木2层华润楠最高，云南银柴最低；层间藤本植物白背瓜馥木和杖枝省藤分别为1973和1819kJg；灌木层干重热值最高仍为厚壳桂，最低为云南银柴；草本层植物干重热值在1592～1752kJg之间.各层优势种平均干重热值和去灰分热值都表现为:层间藤本＞乔木1层＞乔木2层＞灌木层＞草本层.植物器官去灰分热值存在差异，乔木1层中锥栗、荷木树皮及厚壳桂、乌榄树叶最高，乔木2层中云南银柴根最高，层间植物叶＞干＞根，草本植物是地上部分＞地下部分；同种植物（厚壳桂或云南银柴）在不同层次中的去灰分热值没有明显差别，器官生长的年龄（或直径）对去灰分热值有影响，随年龄增大，去灰分热值有减少趋势。Abstract: Investigation of the caloric values of the dominant species from different layers in lower subtropical monsoon evergreen broad- leaved forest in the Dinghushan Mountain may provide scientific foundamental data for studying energy flow and ecological efficiency．The values were measured by the PARR 1281 oxygenic bomb caloric- meter．The mean gross caloric values （GCV） of the 21 dominant species were in the range of 15∙92～19∙80kJ/g．Cryptocarya chinensis was the highest and Canarium pimela was the lowest GCV species in tree layer 1,while the corresponding species were Machilus chinensisand and Aporosa yunnanensis in tree layer 2·The lianas,Fissistigma glaucescens and Calamus rhabdocladus had the values of 1 9·7 3kJ/g and 1 8·1 9 kJ/ grespectively．In the shrub layerthe highest GCV species was Cryptocarya chinensis and Aporosa yunnanensis the lowest．The mean GCV of the three herbaceous species was 15∙92～17∙52kJ/g．The GCV and ash- free caloric value （AFCV） decreased in the following order：lianas tree layer 1,tree layer 2,shrub layer and herb layer．The AFCV differed among various components．In tree layer 1,Castanopsis chinensis and Schima superba showed the highest values in barkswhereas Cryptocarya chinensis and Canarium pimela had their highest values in the leaves．In tree layer 2,however Aporosa yunnanensis showed the highest value in roots．For lianas,the AFCV decreased from the leavesstems to roots．In the herb speciesthe AFCV aboveground was higher than the belowground．Minor differences in AFCV were observed for the same species （Cryptocarya chinensis or Aporosa yunnanensis） in different layers．The AFCV of the woody components tended to decease with age and diameter increment．
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