| The average surface temperature of earth was recorded up by 0.6±0.2℃over the 20 century, and in China 0.5℃～0.8℃increase was shown in the same period. Global climate change will affect greatly environmental, ecological and social economic systems. Agriculture is one of the most sensitive sectors to climate change and rice is one of main foodstuff crop. A field experiment was carried out to investigate the effect of photosynthetic characteristic and hyperspectral characteristic of the rice under three temperature-stress levels in Jiangsu Academy of Agricultural Sciences. The objective of this work is to guide agricultural produce and provide reference for investigating the change pattern in the hyperspectral reflectance of rice plants.The conclusions are as following:(1) The results showed that the net photosynthesis rate of the experiment of all-day warming was the tiptop, followed by control group, daytime warming and night-time wanning, and analysis of variance revealed difference among treatments. at 10:00-12:00, Stomatal conductance of the experiment of all-day warming was the tiptop, control group is the second, and the experimental value of daytime warming and night-time warming was lower than control group. The variation of the experimental value of transpiration rate and Intercellular CO2 concentration was regular, the difference was insignificant among all treatments.(2) The canopy reflectance variation over the near infrared region under different temperature-stress level during different stages was regular. The Hyperspectral reflectance of the rice of all-day warming was higher than others during heading stage; The Hyperspectral reflectance of the rice of all-day warming was lower than others during filling stage.(3) The canopy spectral vegetation indices, the slope of red edge Dλred were the best related to chlorophyll content with R2 > 0.8 except for one or two under different temperature-stress level during different stages, respectively. |
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