气候变化领域集成服务门户(CCPortal): Exploring the use of vegetation indices to sense canopy nitrogen to phosphorous ratio in grasses

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DOI	10.1016/j.jag.2018.08.012
	Exploring the use of vegetation indices to sense canopy nitrogen to phosphorous ratio in grasses
	Loozen Y.; Karssenberg D.; de Jong S.M.; Wang S.; van Dijk J.; Wassen M.J.; Rebel K.T.
发表日期	2019
ISSN	15698432
起始页码	1
结束页码	14
卷号	75
英文摘要	Reduced availability of plant nutrients such as nitrogen (N) and phosphorous (P) has detrimental effects on plant growth. Plant N:P ratio, calculated as the quotient of N and P concentrations, is an ecological indicator of relative N and P limitation. Remote sensing has already been widely used to detect plant traits in foliage, particularly canopy N and P concentrations and could be used to detect canopy N:P faster and at lower cost than traditional destructive methods. Despite the potential opportunity of applying remote sensing techniques to detect canopy N:P, studies investigating canopy N:P remote detection are scarce. In this study, we examined if vegetation indices developed for canopy N or P detection can also be used for canopy N:P detection. Using in situ spectrometry, we measured the reflectance of a common grass species, Yorkshire fog (Holcus lanatus L.), grown under different nutrient ratios and levels. We calculated 60 VIs found in literature and compared them to optimized VIs developed specifically for this study. The VIs were calculated using both the original narrow band spectra and the spectra resampled to the band properties of six satellite sensors (MSI – Sentinel 2, OLCI – Sentinel 3, MODIS – Terra/Aqua, OLI – Landsat 8, WorldView 4 and RapidEye) to investigate the influence of bandwidths and band positions. The results showed that canopy N:P was significantly related to both existing VIs (r 2 = 0.16 - 0.48) and optimized VIs (r 2 = 0.59 – 0.72) with correlations similar to what was observed for canopy N or canopy P. Existing VIs calculated with MSI and OLI sensors bands showed higher correlation with canopy N:P compared to the other sensors while the correlation with optimized VIs was not affected by the differences in sensors’ bands. This study might lead to future practical applications using in situ reflectance measurements to sense canopy N:P in grasslands. © 2018 The Authors
英文关键词	Canopy N:P; Holcus lanatus L.; Nutrient limitation; Remote sensing; Satellite sensors; Spectroradiometer
语种	英语
scopus关键词	canopy; grass; nitrogen; nutrient limitation; phosphorus; radiometer; remote sensing; satellite sensor; vegetation index; Holcus lanatus; Poaceae
来源期刊	International Journal of Applied Earth Observation and Geoinformation
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156536
作者单位	Copernicus Institute of Sustainable Development, Faculty of Geosciences, Utrecht University, Utrecht, Netherlands; Physiscal Geography, Faculty of Geosciences, Utrecht University, Utrecht, Netherlands
推荐引用方式 GB/T 7714	Loozen Y.,Karssenberg D.,de Jong S.M.,et al. Exploring the use of vegetation indices to sense canopy nitrogen to phosphorous ratio in grasses[J],2019,75.
APA	Loozen Y..,Karssenberg D..,de Jong S.M..,Wang S..,van Dijk J..,...&Rebel K.T..(2019).Exploring the use of vegetation indices to sense canopy nitrogen to phosphorous ratio in grasses.International Journal of Applied Earth Observation and Geoinformation,75.
MLA	Loozen Y.,et al."Exploring the use of vegetation indices to sense canopy nitrogen to phosphorous ratio in grasses".International Journal of Applied Earth Observation and Geoinformation 75(2019).