DOI: 10.1016/j.jag.2014.06.010
Scopus记录号: 2-s2.0-84904768443
论文题名: A forestry GIS-based study on evaluating the potential of imaging spectroscopy in mapping forest land fertility
作者: Mõttus M ; , Takala T
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2014
卷: 33, 期: 1 起始页码: 302
结束页码: 311
语种: 英语
英文关键词: Airborne imaging spectroscopy
; Boreal forest
; Forest site fertility
; Narrowband vegetation index
; Sunlit crowns
Scopus关键词: airborne sensing
; boreal forest
; forestry
; GIS
; imaging method
; mapping
; remote sensing
; signal-to-noise ratio
; soil fertility
; spatial data
; spatial resolution
; spectroscopy
; vegetation index
; Finland
; Hyytiala
; Pirkanmaa
英文摘要: Fertility, or the availability of nutrients and water, controls forest productivity. It affects its carbon seques-tration, and thus the forest's effect on climate, as well as its commercial value. Although the availability of nutrients cannot be measured directly using remote sensing methods, fertility alters several vegetation traits detectable from the reflectance spectra of the forest stand, including its pigment content and water stress. However, forest reflectance is also influenced by other factors, such as species composition and stand age. Here, we present a case study demonstrating how data obtained using imaging spectroscopy is correlated with site fertility. The study was carried out in Hyytiälä, Finland, in the southern boreal forest zone. We used a database of state-owned forest stands including basic forestry variables and a site fertility index. To test the suitability of imaging spectroscopy with different spatial and spectral resolutions for site fertility mapping, we performed two airborne acquisitions using different sensor configurations. First, the sensor was flown at a high altitude with high spectral resolution resulting in a pixel size in the order of a tree crown. Next, the same area was flown to provide reflectance data with sub-meter spatial resolution. However, to maintain usable signal-to-noise ratios, several spectral channels inside the sensor were combined, thus reducing spectral resolution. We correlated a number of narrowband vegetation indices (describing canopy biochemical composition, structure, and photosynthetic activity) on site fertility. Overall, site fertility had a significant influence on the vegetation indices but the strength of the correlation depended on dominant species. We found that high spatial resolution data calculated from the spectra of sunlit parts of tree crowns had the strongest correlation with site fertility. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79676
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geosciences and Geography, University of Helsinki, P.O. Box 68, Helsinki FI-00014, Finland
Recommended Citation:
Mõttus M,, Takala T. A forestry GIS-based study on evaluating the potential of imaging spectroscopy in mapping forest land fertility[J]. International Journal of Applied Earth Observation and Geoinformation,2014-01-01,33(1)