Spectral reflectance of leaves for Phyllostachys pubescens at different canopy layers using a 4th order derivative
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摘要: 毛竹 Phyllostachys pubescens 是高效的固碳植物,但在不同光环境下成长的叶片之间有何差异?毛竹怎样最大程度地利用光能?这些问题尚未明确。对1,2,3度毛竹叶片分别从不同朝向,不同冠层高度叶片和不同年龄等3个维度测量了毛竹叶片叶绿素含量及叶片反射光谱,并以Origin为平台对反射光谱数据进行四阶导数处理。结果表明:弱光环境下会造成毛竹叶绿素变化,叶绿素a / b值下降,叶黄素水平降低,类胡萝卜素升高,辅助色素种类增加。随着竹龄增加色素组成改变,光合效能降低。四阶导数能有效地分离重叠峰,提高光谱信息的可读性。结合原始光谱和四阶导数光谱的对比分析,可以有效对毛竹叶片色素含量进行定性定量分析。图3表1参24Abstract: To determine how Phyllostachys pubescens (moso bamboo),a highly efficient photosynthetic plant,efficiently used solar energy and what changes occurred with different light environments,the spectral reflectance of Ph. pubescens leaves was measured in different directions,heights,and ages. There were 36 treatments were set,and 108 samples in total. Then,raw data was processed with Origin 8.0 software using a 4th order derivative. Derivative processing was utilized to decompose overlapped peaks so the derived spectra could improve the signal-to-noise ratio (SNR) of the crude data leading to better qualitative and quantitative analysis. Results showed that in shade conditions,the proportion of chlorophyll changed,chlorophyll a/b declined,and carotenoids and xanthophylls accumulated. Also,potential photosynthesis decreased as Ph. pubescens grew. These results suggested that sun leaves and upper leaves have higher utilization of photosynthesis.[Ch,3 fig. 1 tab. 24 ref.]
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Key words:
- forest ecology /
- Phyllostachys pubescens /
- chlorophyll /
- photosynthesis /
- spectral reflectance /
- 4th order derivative
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2011.06.009
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