武陵地區七家灣溪濱岸植物多樣性及植栽選擇

濱岸植群除可調節溪流之微氣候外，其對濱岸生態系中的物質循環與能量流轉具重要影響，故為瞭解武陵地區七家灣溪濱岸植物多樣性之變化，於七家灣溪主河段、桃山北溪、桃山西溪、高山溪及有勝溪之濱岸，設立30個植群監測樣區。本研究基於所調查記錄95科209屬335種之維管束植物，建議武陵地區植栽的物種選擇，應使用當地的原生樹種或鄉土樹種為原則，且依保安植林、景觀營造之不同目的，提出相關的栽植物種供參考。此外，喬木層植物之種豐富度指數以有勝溪、二號壩測站較高，而觀魚台測站之多樣性較低；此差異主要應為局部地形差異所造成之空間異質性所致。另各測站地被層植物的物種豐富度均頗高，且乾、濕季之多樣性亦無明顯變化；意即調查期間之洪氾對其多樣性影響不大，顯見地被層植物對承受環境逆壓的能力頗高。

關鍵字

七家灣溪；濱岸植群；多樣性；物種豐富度

並列摘要

Riparian vegetation not only regulates the microclimate of streams or rivers but also affects the material cycles and energy flow in the riparian ecosystem. There were 30 vegetation monitored plots set on the riparian zones of the major reach of Chijiawan Stream, Taoshang Northern Stream, Taoshang Western Stream, Kaoshang Stream and Yosheng Stream to study the change of the riparian vegetation diversity on Chijiawan Stream in the Wuling area. According to the investigated 335 species, 209 genera, and 95 families of vascular plants in this study, we suggested to use the native and local species in principle as the choice of the planting in the Wuling area. We also brought up the reference speices lists for different purposes, like protection afforestation and landscaping respectively. Otherwise, the species abundance indices of the overstories on Station Yosheng Stream and Station Dam 2 were found higher than that on the others, and it was lower on Station Fish-watching Platform. We supposed that the difference came from the spatial heterology caused by the local topographic variety. Besides, the species abundance of the understory on each station was pretty high. The diversity had no significant difference between the dry and wet seasons. That meant the flood occurring during the investigation did not affect the diversity much. So, the understory had a remarkable ability to resist the environmental stress.

並列關鍵字

Chijiawan Stream ； riparian vegetation ； diversity ； species abundance

國際替代計量

武陵地區七家灣溪濱岸植物多樣性及植栽選擇

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