Soil nematode abundance and diversity along an altitudinal gradient in Central Taiwan

• Main Authors: Tzu-Ying ArielHo, 何姿頴
• Other Authors: Song-Bin Chang
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/93212847669786243788

碩士 === 國立成功大學 === 生命科學系碩博士班 === 100 === For understanding the responses of soil nematodes to altitudinal gradient variation in Taiwan, the soil nematode abundance and diversity were investigated in four forests, including mixed evergreen broad-leaved India-charcoal trema forest (Dahu), dark coniferous Japanese cryptomeria forest (Fenchifu), dark coniferous Japanese cryptomeria forest (Alishan) and pure coniferous Taiwan spruce forest (Tataka), along an altitudinal gradient in central Taiwan. The qualitative and quantitative analyses of soil nematode communities were calculated, including Shannon index (H’), dominance (λ), evenness (J), genus richness (GR), structure index (SI), enrichment index (EI), basal index (BI) and channel index (CI). There was no significant pattern observed in the result of the abundance of total nematodes. Nevertheless, the abundance of bacterivores under Alishan was significant higher than Dahu and Tataka (p 〈 0.05). And the abundance of omnivores/predators under Dahu was significant lower than the others. As altitude increasing, the diversity, evenness, and genus richness of soil nematode community increased significantly. In contrast, the dominance of soil nematode community declined with altitude. Both EI and SI of Tataka were less than 50 indicated Tataka may be the most disturbed forest site. And the higher BI of Fenchihu and Tataka indicated there may be more environmental stresses under Fenchihu and Tataka than Alishan. Besides, the lowest CI of Alishan suggested the bacterial decomposition pathway may be more important under Alishan than the other forest sites. The H’, J and SI were significantly correlated with soil moisture, soil organic carbon and total nitrogen. The data of this study suggested that the vegetation and climate may be mainly influential factors of the soil nematode diversity patterns along altitude.