Using gis to Study the Spatial Dispersal of Mikania micrantha H. B. K




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以地理資訊系統探討小花蔓澤蘭入侵之空間分布

Using GIS to Study the Spatial Dispersal of Mikania micrantha H. B. K




研究生: 魏佐育 Tso-Yu Wei

指導教授: 陳朝圳 Chaur-Tzuhn Chen

[摘要]

小花蔓澤蘭(Mikania micrantha H. B. K.)之入侵,對於台灣中南部低海拔地區生態系之結構和功能,已造成嚴重的負面影響,且有朝向北部及中高海拔地區擴散之趨勢,如何有效控制該物種之蔓延,為政府一項重要的工作。本研究以地理資訊系統(GIS)為工具,利用數位高程模型(DEM)資料,推估物理環境因子,配合地面樣區調查,建立小花蔓澤蘭之生育環境地理資料庫,以因素分析探討小花蔓澤蘭入侵之環境影響因素,另外為推估全省小花蔓澤蘭之入侵現況,本研究利用克利金法,以全省365個危害位置之調查樣點,推估其他可能危害區域,模擬小花蔓澤蘭危害程度及潛在擴散情形。研究結果顯示,小花蔓澤蘭之入侵對於物理環境之變異具有顯著相關性,海拔2,000m為小花蔓澤蘭分布之上限,海拔高越低危害程度越嚴重;而光量充足及土壤濕潤之地區,適合小花蔓澤蘭生長,由於小花蔓澤蘭屬於攀附性籐本植物,對於造林木之危害以幼小枝下高低之闊葉樹種為主,而小花蔓澤蘭主要危害樹種有相思樹、台灣櫸、光臘樹等。由克利金內插分析,推估全台灣目前小花蔓澤蘭之危害分布圖,由樣區資料及推估資料可知,南部地區較北部地區危害嚴重,而以南投、嘉義、屏東縣危害程度最大。本研究所建立之小花蔓澤蘭入侵空間分布資料庫,可供小花蔓澤蘭入侵之長期監控,並可提供林務局進行小花蔓澤蘭危害之造林撫育工作之參考。

關鍵字: 小花蔓澤蘭、生態入侵、地理統計、擴散

【Abstract】

The invasion of Mikania micrantha affectes on structure and function of ecosystem in the low elevation of Taiwan south area. At present, it is quickly invading to the middle and high elevation in north area of Taiwan. It’s an important topical subject that how to control the spread circumstance to other place. This study use geographic information system (GIS) as a spatial analyzing tool to integrate the Digital Elevation Model (DEM) data, ground surveying data and the physical environment factors into a geographic database. Factor analysis was used to analyze the habitat of Mikania micrantha and used the Kringing model to predict dispersal of Mikania micrantha with 365 sample data that investigate at whole area of Taiwan. The results indicate that the physical environment determine whether Mikania micrantha will be an invader or not? 2,000 m of elevation is upper limit habitat of Mikania micrantha and high elevation was negative correlation with dispersal ability. High light and wet environment is a suitable habitat for Mikania micrantha and it is a parasite that have high harmed rate for lower bole height of broadleaf tree of artificial forest, such as Acacia confusa, Zelkova serratta, Fraxinus Americana etc. From the invaded distribution of Mikania micrantha in Taiwan, south area is endanger than north area, Nantou, Pingtung and Chiayi County are those found in the wild. This study establish the geographic database of dispersal distribution for Mikania micrantha that will provide a guideline for forest plantation, tending and long-term monitoring for Mikania micrantha invasion in future.



Keyword:Mikania micrantha Invasions Geo-statistics dispersal


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