摘要
研究了黑石顶自然保护区南亚热带常绿阔叶林５种乔木优势种的热值及其季节变化，结果如下：５种植物各器官的干重热值和去灰分热值因种而异，同种植物不同器官之间热值存在明显差异，干重热值受灰分含量影响变异增大。５种植物各器官的干重热值变化范围是：叶１８．４２７～２１．３６１ｋＪ／ｇ，幼枝１７．６１７～１９．９４２ｋＪ／ｇ，干皮１５．７３６～１９．０７９ｋＪ／ｇ，干材１７．８１７～１８．７８１ｋＪ／ｇ，根皮１７．３７４～１９．２１７ｋＪ／ｇ，根１７．９４８～１９．２２２ｋＪ／ｇ，植物器官干重热值的变化顺序是：叶最大，干、根最小，幼枝、根皮、干皮介于最大和最小二者之间。５种植物各器官去灰分热值变化范围分别是：叶２０．２５１～２２．４３１ｋＪ／ｇ，幼枝１８．６５４～２０．１９２ｋＪ／ｇ，干皮１８．２８１～１９．４５５ｋＪ／ｇ，根皮１９．２０５～１９．９５６ｋＪ／ｇ，干材１８．００３～１８．７８１ｋＪ／ｇ，根１８．６３４～１９．３２４ｋＪ／ｇ，植物各器官去灰分热值变化次序与干重热值相似。各种植物地上部分各器官去灰分热值有一定的季节变化，变化程度因种而异，以硬叶和小叶胭脂最明显。植物各器官去灰分热值从１９９３年１２月到１９９?
The caloric values changing with seasons of five dominant species for the tree layer in the south subtropical evergreen broadleaved forest in Heishiding Nature Reserve,were determined using the GR3500 type bomb calorimeter.The results are as follows.The gross caloric values and the ashfree caloric values of various organs changed among dominant species.For the same species,the gross caloric values altered greatly,resulting from ash contents of different organs.The gross caloric values of different organs for the five dominants ranged from 18.427 to 21.361kJ/g for leaves,17.617～19942kJ/g for twigs,15.736～19.079kJ/g for trunk barks,17.817～18.781kJ/g for trunks,17374～19217kJ/g for root barks,17.948～19.222kJ/g for roots,respectively.According to the gross caloric values,the sequence of different organs for the same species among the 5 dominants was that the maximum was leaf,followed by the group of young branch,root bark and trunk bark which were more or less equal to one another,the minimum were the group of trunk and root because of their being equal to large extent.The ashfree caloric values of various organs for five species ranged from 20.251～22.431kJ/g for leaves,18654～20192kJ/g for twigs,18.281～19.455kJ/g for trunk barks,19.205～19.956kJ/g for root bark,18.003～18.809kJ/g for trunks,18.634～19.324kJ/g for roots,respectively.The ashfree caloric values of different organs for the same species among the five dominants were similar to that mentioned above in gross caloric values sequence.The ashfree caloric values of five dominant species were fluctuated with seasons.The extension of flunctuation depended on dominant species.Among them,Lithocarpus lohangwu and Artocarpus styracifolius were the species which caloric values changed extensively.The ashfree caloric values for different aboveground organs of five species from December,1993 to July,1994 possessed the following trend:the increments of ashfree caloric values of leaves were higher than that of twigs and trunk barks.The increments of ashfree caloric values of trunks was not altered distinctly.The ashfree caloric values of leaf litter in the different months averaged to be 21.22kJ/g being slightly less than that of the fresh leaves for the five dominants.Meanwhile,the ashfree caloric values of branch litter collected in various months averaged to be 19.657kJ/g,that was slightly larger than that of the young branches for the five dominants.
出处
《生态学报》
CAS
CSCD
北大核心
1998年第3期263-268,共6页
Acta Ecologica Sinica
基金
国家自然科学基金
关键词
热值
优势种
常绿阔叶林
凋落物
caloric value,dominant,evergreen broadleaved forest,litter.
