title: [High-spectral responses of Myrica rubra seedlings to UV-B radiation stress].
abstract: A simulated field experiment with three treatments, i. e., ambient light (control), reduced UV-B radiation, and enhanced UV-B radiation, was conducted to evaluate the effects of solar ultraviolet (UV-B) radiation on the seedlings of Myrica rubra, a typical woody species in subtropical region. The leaf chlorophyll content, spectral reflectance and spectral characteristic parameters were measured and analyzed. As compared with the control, enhanced UV-B radiation decreased the seedling chlorophyll content while reduced UV-B radiation significantly increased the chlorophyll content, and these effects reflected in the spectral reflectance. Under the effects of the three gradients of UV-B radiation, the differences in the reflectance at visible region mainly occurred around the green peak and red edge on the reflectance curve, and the peak wavelength of the red edge shifted to longer wavelength. Enhanced UV-B radiation had an accumulated temporal effect on M. rubra. The inverted-Gaussian model parameters R0, lambda0, lambda(p), Rs, and 6 were the useful guides to reveal the spectral responses of M. rubra seedlings under UV-B radiation stress, among which, Rs performed the best. The differences in the spectral reflectance under different UV-B radiation levels could be effectively distinguished with the vegetation indices composed of the spectral reflectance of narrow wave bands or the reflectance at specific wavelengths.
authors.affiliation: Cultivation Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang Agriculture and Forestry University, Lin'an 311300, Zhejiang, China. j1052524741@126.com
authors.forename: Xin-Jie
authors.initials: XJ
authors.lastname: Jin
authors.forename: Hong
authors.initials: H
authors.lastname: Jiang
authors.forename: Jian
authors.initials: J
authors.lastname: Chen
authors.forename: Qi-Long
authors.initials: QL
authors.lastname: Shi
authors.forename: Qian-Qian
authors.initials: QQ
authors.lastname: Zhang
mesh_terms: D002681:China; D002734:Chlorophyll / Q000032:analysis; D017753:Ecosystem; D004784:Environmental Monitoring / Q000379:methods; D008962:Models, Theoretical; D031641:Myrica / Q000502:physiology / Q000528:radiation effects*; D018515:Plant Leaves / Q000737:chemistry; D058998:Remote Sensing Technology / Q000379:methods*; D036226:Seedlings / Q000502:physiology / Q000528:radiation effects*; D013312:Stress, Physiological / Q000502:physiology*; D014466:Ultraviolet Rays
chemical_list: D002734:Chlorophyll