福建和溪亚热带雨林优势植物叶的热值研究

 本文探讨福建和溪亚热带雨林各层主要优势植物种成熟叶的热值含量及其变化规律。结果表明：该雨林—年中主要树种叶片热值的含量范围：乔木层红栲、乌来栲、红鳞蒲桃、厚壳桂和茜草树分别为19.94～21.18、20.34～21.33、19.98～21.04、21.99～23.21和19.17～21.08kJ/g；灌木层罗伞树、九节木、柏拉木、斜基粗叶木、走马胎和草珊瑚分别为18.45～20.20、19.18～20.04、17.36～18.47、17.14～18.44、17.11～18.44和19.50～20.14kJ／g；草本层福建莲座蕨和单叶新月蕨分别为18.22～18.98和15.11～16.75kJ／g；层间植物花皮胶藤、密花豆藤和扁担藤分别为19.73～22.57、19.43～21.11和18.87～20.37kJ／g。各层叶热值含量大小为乔木层>灌木层>草本层。层间植物大藤本由于能达林冠利用充足阳光也具较高热值；同时含有乳汁、挥发性芳香油类等的植物热值较高。落叶的热值均高于各层成熟鲜叶的平均热值。

STUDY ON THE CALORIC VALUES OF DOMINATING PLANTS IN A SUBTROPICAL RAIN FOREST IN HEXI OF FUJIAN

The paper deals mainly with the caloric content and its dynamics of various layer mature leaves of dominating plants in a subtropical rain forest on Hexi, Fujian. In the forest, the caloric content of dominating plant leaves in a year was as follows. In arborous layer it was 19.94～21.18 kJ·g-1 for Castanopsis hystrix, 20.34～21.33kJ·g-1 for C. uraiana, 19.98～21.04kJ·g-1 for Syzygium hancei, 21.99～23.21 kJ·g-1 for Cryptocarya chinensis and 19.17～21.08kJ·g-1 for Rhandia densiflora, respectively. In shrub layer, it was 18.45～20.20kJ·g-1 for Ardisia quinquegona, 19.18～20.04kJ·g-1 for Psychotria rubra. 17.36～ 18.47kJ·g-1 for Blastus cochinchinensis, 17.14～18.44kJ·g-1 for Lasianthus wallichii, 17.11～18.44 kJ·g-1 for Ardisia gigantifolia and 19.50～20.14 kJ·g-1 for Sarcandra glabra, respectively. In herbaceous layer, it was 18.22～19.98 kJ·g-1 for Angiopteris fokensis and 15.11～16.75 kJ·g-1 for Pronephirium simplex, respectively. In Woody liana, it was 19.73～22.57kJ·g-1 for Ecdysanthera utilis, 19.43～21.11 kJ·g-1 for Spatholobus suberectus and 18.87～20.37 kJ·g-1 for Tetrastigma planicaule, respectively. The layer mean caloric value followed the following order: arborous layer>shrub layer> herbaceous layer. The caloric value of liana was no less than that of arbor. The special organic compounds (e. g. , milk sap, oil spot and aromatic compounds, etc. )affected the caloric values of the plants, the caloric content increased when plants contained those compounds. The caloric value of fallen leaves was greater than that of the fresh mature leaves of various layer.