The Photosynthetic And Spectral Reflectance Characteristics Of Five Acer Species In Changbai Mountain

The study object of this paper are five Acer species in Changbai Mountain, which inclue Acer mono, Acer tegmentosum, Acer mandshuricum, Acer pseudo-sieboldianum, Acer barbinerve. Light response parameters, spectral reflectance, spectral reflectance indices, pigment content and leaf anatomic structure of five Acer species are compared to analyze the differences and similarities of physiological and ecological characteristics among species, and to explore the relationship between photosynthetic and spectral reflectance characteristics.The results show that:Non-rectangular hyperbola model can be the most accurate on five species of Acer plants with the light response curves are fitted, and can reflect the physiological characteristics of photosynthesis. Acer mandshuricum is the most adaptable species to the understory light environment with maximum photosynthetic rate (Amm) and light saturation point (LSP) significantly higher than other four Acer species (p<0.05).There is a spectral reflectance peak around550run which can be used to detect different species. Both chlorophyll normalized difference index (ChlNDJ) and photochemical reflectance index (PRT) of Acer mandshuricum are significantly higher than other four Acer species(p<0.05). The ChlNDI and XK of five Acer species are positively correlated with chlorophyll content, and also related to the Amax.Palisade/spongy of Acer mandshuricum (BN) is the highest, which means that Acer mandshuricum (BN) can adapt to the understory light environment better with higher photosynthesis.