非成像高光谱数据的特点为树种的精细识别提供了可能。非成像高光谱数据的多波段特性,使得利用数据间的微小差异来进行树种的识别分类研究成为可能。该文利用光谱相关匹配(Spectralcorrelation m atch ing,SCM)方法来对树种进行识别分类...
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非成像高光谱数据的特点为树种的精细识别提供了可能。非成像高光谱数据的多波段特性,使得利用数据间的微小差异来进行树种的识别分类研究成为可能。该文利用光谱相关匹配(Spectralcorrelation m atch ing,SCM)方法来对树种进行识别分类,分别采用均值平滑法、中值平滑法、小波包变换对高光谱数据进行预处理及识别分类研究。结果表明,经过数据平滑预处理,可以有效地去除噪声,提高叶片高光谱数据的树种分类的精度。小波分析能有效的去除光谱中的噪声信息,保留光谱中的有效信息。在小波包变换的基础上,经过中值滤波数据预处理之后的分类精度高于均值滤波数据预处理后的分类精度。
[Objective] This study aimed to reveal the impact of radiative forcing on the woody plants in subtropical regions of China through the study on the effect of radiative forcing on growth and photosynthetic responses of...
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[Objective] This study aimed to reveal the impact of radiative forcing on the woody plants in subtropical regions of China through the study on the effect of radiative forcing on growth and photosynthetic responses of Elaecarpus glabripetalus Merr. seedlings. [Method] Three gradients of radiative forcing treatments were applied to the species namely, control group （100% natural light）, weak radiative forcing group （39% natural light） and strong radiative forcing group （16% natural light）. The relative contents of chlorophyll, photosynthetic parameters of E. glabripetalus in different periods were measured to analyze the effects of different gradients of radiative forcing on plant height, ground diameter, chlorophyll content, gas exchange parameters, light response cure parameters. [Result] The increased ground diameter of E. glabripetalus in different treatments was the control weak radiative forcing group strong radiative forcing group; the increased plant height in the early period was strong radiative forcing group weak radiative forcing group control, but there was no significant difference during the late period; the relative content of chlorophyll was strong radiative forcing group weak radiative forcing group control. The light compensation point （LCP）, light saturation point （LSP） and the maximum net photosynthetic rate （A max ） were reduced in radiative forcing treatments. The stomatal conductance （G s ）, transpiration rate （Tr） of E. glabripetalus in strong radiative forcing group were significantly smaller than that in the control group, while there was no significant change in dark respiration rate （R d ） and apparent quantum yield （AQY）. [Conclusion] In summary, the radiative forcing can change the environmental factors which have significant effect on the ground diameter, plant height, relative content of chlorophyll and photosynthetic physiological parameters, but with the processing of treatment the effects on ground diameter and plant height increas
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