文献类型： 外文期刊

第一作者： Meng Lei

作者： Meng Lei;Wu Yong-feng;Lu Guo-hua;Song Ji-qing;Hu Xin;Ren De-chao

作者机构：

关键词： Winter wheat canopy;Soil surface moisture;Late frost injury;Hyperspectral parameters

期刊名称：SPECTROSCOPY AND SPECTRAL ANALYSIS （ 影响因子：0.589； 五年影响因子：0.504 ）

ISSN： 1000-0593

年卷期： 2017 年 37 卷 5 期

页码：

收录情况： SCI

摘要： To explore the characteristics of hyperspectral reflectance responding to late frost damage in winter wheat canopy under different topsoil moisture levels and test abilities of sensitive wavelengths to predict extents of yield change, respectively, pot experiments with three levels of topsoil moisture of Dry (<10%), Moderate (10%similar to 20%) and Wet (>20%) were conducted at the jointing stage of winter wheat in the year of 2013 and 2014. After topsoil moisture treatments, frosting experiments were carried out in a specified cold climate chamber. This study analyzed differences of the ear number per plant, kernel number per ear, 1000-kernel weight, yield per plant and canopy spectral reflectance and corresponding first derivative reflectance of the frosted winter wheat canopy under different topsoil moisture levels. Correlativity and linear fitting were made for hyperspectral parameters and yield change rate of the frosted winter wheat. The results indicate that (1) kernel number per ear and yield per plant generally have a reducing trend with the decrease of topsoil moistures. Late frost injuries showed the most significant (p< 0. 05) influences on winter wheat yield under conditions of the treatment Dry. (2) In green peak region (near 523 nm), yellow edge region (near 571 nm), red edge region (near 732 nm) and two water absorption bands (around 952 nm and 1 145 nm) of the near-infrared region, the first derivative reflectance of winter wheat canopy was more different under conditions of the treatment Dry + Frost than the treatment Moderate + Frost and Wet + Frost. (3) After removing the influences of different topsoil moistures on spectrum reflectance, difference curves of the first derivative reflectance responding to late frost damages under the treatments Dry, Moderate and Wet were quite different mainly in the yellow edge region (centered at 570 nm) and the red edge region (centered at 710 nm). (4) In the two years experiments, yellow edge area (SDy) and first derivative value at 570 nm (d570) were significantly (p<0. 05) and positively correlated with yield change rate (YCR) of the frosted winter wheat, respectively, which shows that hyperspectral parameters in the yellow edge region can be used to detect the differences of late frost damage due to the different topsoil moistures impacts. This study will provide a basis for prediction of the variations in winter wheat yield under the stacking effects of different topsoil moistures and late frost damages using hyperspectral reflectance parameters.

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