2009-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/713817摘要：外來種生物的侵害對於自然及人類生存的環境有極大的危害，據保守估計全球每年生物入侵的損失約上千億美金。在台灣約279種引進的外來種植物已經成功的野化，其中最具侵凌性的植物之一是由中南美洲引進的多年生闊葉蔓藤類—小花蔓澤蘭，此外來種常攀附在地面、灌叢及林冠上方，蔓莖及葉片會整個覆蓋在林冠上，顯著的影響樹木的光合作用，最終導致林木的危害致死，並直接影響許多野生動物的棲息環境，所以小花蔓澤蘭的入侵已經造成台灣經濟及生態上嚴重的危害。本研究主要的目的是結合遙測技術和現地資料來估計台灣小花蔓澤蘭的空間分布與生物量，研究者將使用小尺度Formosat-2影像來量化被入侵的植被在其開花季節的亮度；從中尺度Landsat影像所演算出的植生指標來測估此物種在播種期其乾枯植株對樹冠綠度的遮蔽度；及運用大尺度MODIS植生指標時間序列變動量資料來研究小花蔓澤蘭的物候學。這些由遙測獲得的資訊，與現地小花蔓澤蘭生物量採集資料的結合，應可做為現今台灣小花蔓澤蘭生物量估測的依據。本研究的結果將可做為相關單位在管理外來種植物時的參考。 本計畫擬以兩&#63886;依序完成下&#63900;研究項目： 第一&#63886;：小花蔓澤蘭生物量預測模型建立。 第二年：研究結果驗證、預測模型修正及系統化監測系統建立。<br> Abstract: Alien species invasions are some of the most formidable threats to natural environments and human well-being; they have been identified as a major non-climatic driver to global change. The definable cost of environmental damages and associated management and control would be hundreds of billion per year; the total amount could be several times more if monetary values of native species extinctions, biodiversity reduction, ecosystem services and aesthetics can be assessed. In Taiwan, there are about 279 introduced floras that well adapt to the natural environments and 50+ of them are invasive. One of the most troublesome species in Taiwan is Mikania micrantha, a Central and Southern American vine species, which now can be commonly found in the highly vegetated lowlands of Taiwan. The main goal of the proposed study is to assess the abundance (biomass) of M. micrantha by integrating multi-scale remotely sensed images and field observations. The high spatial resolution Formosat-2 images will be used to highlight the brightness of infested vegetation during the flowering season in November-January since M. micrantha will produce a significant amount of bright-colored inflorescence on the top of canopy. Vegetation indices [the Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI)] derived from Landsat Thematic Mapper (TM) will be utilized to assess the reduction of tree canopy greenness caused by senescent M. micrantha after the flowering season. The Moderate Resolution Imaging Spectroradiometer (MODIS) time-series NDVI and EVI will be used to investigate the uniqueness of vegetation phenology of invaded sites. Integration of these satellite-derived information and field biomass should facilitate the regional mapping of M. micrantha in Taiwan. The outcome of this study would be useful for related government agencies to manage exotic species. The main work schedule for this two-year research follows: Year 1: Multi-scale estimation of M. micrantha biomass for the entire Taiwan. Year 2: Results validation, models adjustment and a systematic M. micrantha monitoring system establishment.生物入侵生物量Formosat-2Landsat小花蔓澤蘭MODIS遙測植生指標biological invasionbiomassFormosat-2LandsatMikania micranthaMODISremote sensingvegetation index