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从广东鹤山南亚热带丘陵5种人工林群落中采集20种主要植物器官及3种群落凋落叶样品,利用PARR-1281氧弹热量计和马福炉分别测定样品的干质量热值和灰分含量,再计算去灰分热值;按器官、个体和生长型等比较分析植物的热值和灰分特征.结果表明:植物各器官的干质量热值、去灰分热值分别在10.7～22.17和13.89～23.04kJ·g-1之间,叶片的干质量热值和去灰分热值明显高于其他器官(P<0.05).个体加权平均干质量热值和去灰分热值分别在14.24～19.43和16.63～20.99kJ·g-1.群落各层次植物去灰分热值平均值的高低依次为:乔木(19.55kJ·g-1)>灌木(19.46kJ·g-1)>草本(18.77kJ·g-1),其中,乔木层树木的去灰分热值平均值大小为:本地针叶树(19.86kJ·g-1)>本地阔叶树(19.55kJ·g-1)>外来桉树(19.18kJ·g-1),灰分含量的排序则相反.马占相思林、针叶林和木荷林群落的凋落叶热值均高于所在林分各层次的热值(P<0.01),马占相思林和针叶林的凋落叶热值大于所在乔木层叶片的热值,而木荷林凋落叶热值小于乔木层叶片的热值.
Twenty main plant organs and three litterfall samples were collected from five plantation communities in the Hilly subtropical hilly area in Guangdong Province. The dry weight calorific value and ash content of the samples were measured using PARR-1281 bomb calorimeter and muffle furnace respectively. The value of calorific value and ash content of plants were compared by organ, individual and growth type.The results showed that the calorific value of caloric value and ash removal calorific value of every plant were 10.7-22.17 and 13.89-23.04 kJ · g-1, the dry caloric value and ash-removing calorific value of leaves were significantly higher than those of other organs (P <0.05) .The weighted average dry weight calorific value and ash-removing calorific value were 14.24 ~ 19.43 and 16.63 ~ 20.99 kJ · G-1. The average values of ash-to-calorific value of plants at different levels of community were as follows: tree (19.55kJ · g -1)> shrub (19.46kJ · g -1)> herb (18.77kJ · g -1) Among them, the mean values of ash-to-calorific value of arbor layer were: native conifer (19.86kJ · g-1)> native broadleaf tree (19.55kJ · g-1)> exotic eucalyptus (19.18kJ · g-1) The order of the contrary is the same.The litter values of Acacia mangium, coniferous forest and wood are the highest (P <0.01), leaf litter acacia mangium calorific value and the calorific value greater than a coniferous forest trees where the layers of the blade, and the calorific value of wood superba leaf litter layer is less than the heating value of tree leaves.