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 C
ryptocarya 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．
下载: