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