Investigation of sulfur dioxide influence on canopy spectral characteristics at early growth stage of rice.(Report) Zhang, JinHeng; Han, Chao; Li, Dapeng; ...

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Authors
Zhang, JinHeng ; Han, Chao ; Li, Dapeng ; Liu, ShuTang ; Zhang, ZhenHua
Appears In
Australian Journal of Agricultural Engineering
Subjects
Rice; Plant canopies -- Observations; Sulfur dioxide -- Influence
Audience
Academic
Summary
Field experiment was laid out in a split plot design with three varieties of rice. Rice samples were exposed to sulfur dioxide at different concentrations inside fumigation chamber. After measurement rice canopy reflectance spectrum, leaves of rice canopy were sampled to analyze physiological characteristic. The investigation mainly focuses on four parts. (1) S[O.sub.2] concentration was significantly negative correlation with pH and chlorophyll content (correlation coefficients R from -0.621 to -0.503). (2) Investigation on characteristics of spectral curves indicated that differences in S[O.sub.2] concentration impacted the spectral reflectance especially on the green reflectance peak and red absorption dip. (3) Correlation analysis showed that the average reflectance ([rho]blue, [rho]green, [rho]red, [rho]nir) and DVI ([rho]red -[rho]green, [rho]green -[rho]blue, [rho]nir-[rho]red, [rho]nir- [rho]green, [rho]680-[rho]560 and [rho]760-[rho]560) were significantly different at the 0.001 level. Almost all DVI were significantly correlated with chb and cht at 0.05 level or above. (4) [rho]blue correlated significantly with soluble protein and MDA. pH had a very significant correlation with chlorophyll content. Almost all DVI were significantly correlated with pH. Vegetation indices [rho]blue, [rho]nir-[rho]red , [rho]green and [rho]760-[rho]560 were selected to estimate MDA content, chlorophyll b content , soluble protein and pH respectively. Cht was selected to estimate S[O.sub.2] concentration and pH, respectively. Keywords: Correlation; difference vegetation indices; physiological characteristic; regression model; sSpectral curve
Bookmark
http://trove.nla.gov.au/work/78969540
Work ID
78969540

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