Study on dependent plants at Guandaushi forest ecosystem

• Main Authors: Jiang, Ying-Yu, 江英煜
• Other Authors: Ming-Yih Chen, Jeng-Tze Yang
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/90727203675695865861

碩士 === 國立中興大學 === 植物學系 === 84 === Dependent plants play an important role on the structure and diversity of Guandaushi forest ecosystem. Their distribution distinctly correlated to the microenvironment of the different forest types. Different microenvironments have different flora and different importance value indices, thus, the composition of dependent plants varies with microenvironment. It can be used as the parameters for monitoring the environmental changes in the forest ecosystem.Dependent plants could be subdivided into epiphytes and vines. According to the investigation of ten sampling plots , dependent plants can be divided into four groups by using Jaccard coefficient and the clustering method of UPGMA. The dominant dependent plants are:(1) Asplenium nidus and Piper kadsura in natural forest;(2) Asplenium normale and Piper arboricola in artificial plantation;(3) Pseudodrynaria coronans and Pyrrosia lingua in burned forest;(4) The secondary hardwood forest can''t be clearly subdivided into several groups. The components of plot LC and LD , Pseudodrynaria coronans and Embelia lenticellata are the most dominant.The distribution of dependent plants distinctly influenced by the DBH and the vertical levels along the host trees. The abundance of epiphytes increases with the DBH of the host trees. However, the vines do not distinctly correlate to the DBH of trees. Epiphytes are more abundant at the lower level A and B in the canopy, and less of them at the higher level E.The investigation of invertebrate fauna in 31 substrates, which comprised 16 samples of Asplenium nidus samples and 15 ones of Pseudodrynaria coronans . There are totally 21948 individuals of invertebrates, collected by using Berlese funnel.The invertebrate fauna includes 2 phyla, 6 classes and 24 orders. There are 17490 individuals of insects ( including larvae ) belonging to 16 orders in 88 families , which occpying 79.69% of all collected invertebrates. There are 7656 individuals of ants comprising of 34.88% and 6914 individuals of Collembolaoccupying 31.49% of all collected invertebrates were found, as two major groups of insect fauna in the substrate of epiphytes in Guandaushi forest ecosystem.The component analyses of two different epiphytic substrates were conducted. The water content of totally 31 samples ranging from 20.20% to 585.71%. The pH value among these substrates is no more than 5.89, almost acidic. The content of organic matters of all samples is higher than 74%, except one, EP12 being 49.74%. The ratio of C to N of these substrates does not comelate neither to the dry-weight excluding leaves nor to the distance of the substrate above ground. The main nutrient components including P、K、Ca、Mg are also higher than that of the grounded soil in the same plot of Guandaushi forest ecosystem. The ratios of C to N of these substrates do not correlate neither to the dry weight excluding leaves nor to the distance of the substrates above ground.