摘要
在测定了南亚热带鼎湖山的４种植物群落３７种主要植物热值的基础上得知：所有这些植物各器官的干重热值和去灰分热值分布范围为：叶片１７２４２．７～２４５３３．３Ｊ·ｇ－１和１８１８８．５～２５８７９．０Ｊ·ｇ－１；根１４９２７．１～１９２８７．８Ｊ·ｇ－１和１５６２０．７～２０３４５．８Ｊ·ｇ－１，枝、干１６１５８．１～２１８１５．９Ｊ·ｇ－１和１６９０８．９～２３０１２．６Ｊ·ｇ－１。呈现叶＞枝或干＞根，地上部分＞地下部分的格局；同一群落从乔木层到草本层，各层次的叶片和平均干重热值是逐渐减小的，且上层乔木单位面积叶片含能量高于下层灌木的，这种格局可能与群落内光照强度的递减有关；同一种植物在演替早期各群落内的热值差距大，而在演替后期各群落内的热值差距小得多，这意味着随群落演替的进行，生境趋同性增大，因而热值接近；各群落内叶片的热值最高，凋落叶的次之，地被物的最小，影响凋落叶释放能量的主要因素不是微生物数量的大小，而可能是温度、淋溶和水分等生态因子。
The gross and ash free caloric values of plants were determined for 37 species of 4 plant communities at Dinghushan,Guangdong province,China.Mean ash free caloric values of the plants were as follows:leaf(18188.5￣25879.0J·g -1 )>branch or stem (16908 9￣23012 6 J·g -1 ) >root(15620 7￣20345 8J·g -1 );The caloric value decreased from arbor layer to shrub layer till herb layer at the same community.The caloric value of leaves showed the same trend,being related to the light extinction in the community.The variaion in caloric value of a certain plant species among the communities at the early successional stages,such as mountain shrub grassland coniferous forest was greater than that of the same plant species at the late successional stages,such as coniferous broadleaved forest and monsoon evergreen broad leaved forest.The caloric value of canopy leaves was higher than that of the newly shed litter foliage,And the caloric value of the newly shed litter foliage was higher than that of the ground litter rotting.Temperature and leaching might be the main ecological factors influencing the releasing of energy of litter foliage.
出处
《植物生态学报》
CAS
CSCD
北大核心
1999年第2期148-154,共7页
Chinese Journal of Plant Ecology
基金
国家自然科学基金
关键词
热值
鼎湖山
植物群落
Caloric value,Succession,Dinghushan
