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頁籤選單縮合
題名 | Seasonal Changes in Canopy Spectra of Sweet Potato=甘藷植被光譜之季節變化 |
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作者 | 楊純明; 葛齊家; | 書刊名 | 航測及遙測學刊 |
卷期 | 3:1 1998.03[民87.03] |
頁次 | 頁13-27 |
分類號 | 434.31 |
關鍵詞 | 季節變化; 植冠光譜; 甘藷; 植被指數; 特徵波長; 反射比; Seasonal change; Canopy spectrum; Sweet potato; Vegetation index; Characterized wavelength; Reflectance; |
語文 | 英文(English) |
中文摘要 | 近年來以衛星多光譜遙測資料分析地面植被覆蓋及發展植被外觀徵狀模式之研究 蓬勃進展,惟常因缺乏地面光譜遙測資訊的配合,使得解析之精確度與準確度稍嫌不足。植 物生育全期持續而詳細地光譜測定,不僅有助於判別不同生育階段植被之光譜差異,同時可 利用於區分該植物種類或品系光譜之特徵波長。本文研究乃於1995年及1996年偵測田間栽 培之甘藷(Ipomoea batatas cv. Tainung 57)地上部植冠(植被)反射光譜(波長範圍介於350-1100 nm),並試以釐清其光譜特徵波長。根據試驗結果,兩不同生長期所測得之反對比光譜曲線 類似,惟均受到環境與植株生長狀況影響。在反射光譜之輻射量上,以紫外線波段(<400 nm) 所占有比例最低,少於全量1%;可見光波段(400-740nm)居次,介於20∼27%;紅外線波段 (>740 nm)最高,介於70∼80%。甘藷反射輻射量光譜及反射比光譜類同於其他綠色作物之 趨勢表現,由前項光譜曲線之波峰及波谷發現28條特徵波長,而後項反射比光譜則具有6 條特徵波長,兩生長季節相同。自反射輻射量光譜中找出3特徵波長,分別為554、688、 及754nm,以計算各項植被指數。各植被指數全期回歸曲線呈曲線趨勢,一般言曲線隨生 長高峰達到頂點,再隨成熟老化而下降。 |
英文摘要 | In recent years use of multispectral satellite data to analyze plant cover and for developing phenological models has been prosperous. However, a ground-based continued and detailed study of spectral measurements throughout the growing season would be useful, by which not only spectral differences within and among seasons may be clarified but also the characterized wavelengths of crop species and variety may be identified. In the present study the reflectance spectra from 350 to 1100 nm were measured and the characterized wavelengths were recognized for the canopy cover of sweet potato (Ipomoea batatas cv Tainung 57) grown in the field in 1995 and 1996. It was found the reflectance spectra of fresh canopy grown in different years were roughly similar, varied with environment and growth status. The ratio of reflected radiance in the UV region (<400 nm) was far below 1%. The visible wavelengths (400-740 nm) were ranged from 20 to 27%, while near IR band (>740 nm) were ranged from 20 to 27%, while near IR band (>740 nm) were fluctuated in 70-80%. Patterns of spectral irradiance and reflectance look similar to other green crops. The same 28 wavelengths were identified from the spectral radiance curves while only 6 characterized wavelengths were selected from reflectance spectra of sweet potatio in both 1995 and 1996. Three wavelengths from spectral irradiance, 554, 688, and 754 nm, were further chosen for the calculations of vegetation indices. The vegetation index regression curves were curvilinear after planting, the increase of the curves stands for the building up of plant canopy and the curves fall of as plant aged. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。