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Reflectance Analysis of Turbinaria peltata and Platygyra daeda in Luhuitou Sanya Bay
Chen Yong-qiang; Chen Biao2; Lei Xin-ming; Xie Qiang3; Huang Hui1
AbstractIn order to further understand the spectral characteristics of different shapes and different colors of scleractinian coral, reflectance spectra of two common scleractinian coral species (brown schistose Turbinaria peltata and blue gray massive Platygyra daeda) were measured using a fiber spectrometer in the sea area of Lu Huitou Sanya Bay in the north-western South China Sea (SCS). On the morning of July 22, 2015, 7 samples for each species were collected. The size of the samples was 6 cm, and was fostered to laboratory reef aquariums, in which water temperature was controlled -26 degrees C. The reflectance spectra were measured after the samples were fostered for more than 4 hours in the reef aquarium, and weather condition was sunny day without clouds. Using a spectrometer (USB2000+), band 200 similar to 850 nm, resolution 1.34 nm, step length 0.6 nm, and field angle 25 degrees, the sample was placed on the cylinder platform, and similar to 26 degrees C seawater was continuously injected to ensure the water temperature was constant. The extra seawater automatically spilt from the upper edge of the aquarium to exclude the "converging phenomenon" of the refraction of light into the water body. The black nylon cloth was adhered to the inter side wall of the aquarium to avoid the reflection effect. The distance between the probe and the sample was 5 cm, and the reflectance was the average of repeated 10 times measurements. The light source was the sun light, and the calibration of the spectrometer was carried out every time before the measurement, and reflectance spectrum in the visible light band was used to analyze the character of the reflectance of the samples. Then for spectral reflectance analysis, derivative spectroscopy was used to study the difference of the reflectance spectrum of them. The results showed that the reflectance of two kinds of coral is obviously different from each other in the visible wavelength range. The reflectance of Platygyra daeda was significantly higher than that of Turbinaria peltata with significant differences, and a similar high reflectance appeared only near 700 nm. The reflectance of Turbinaria peltata was between 4% and 15% with significant peak and trough. In 400 similar to 450 nm area reflectance of Turbinaria peltata showed a relatively lower value of about 4%similar to 5%; after 480 nm it soared to around 10%, and obvious peaks appeared at 502, 578, 604 and 652 nm, and the main peaks at 604 nm, and 578 and 652 nm were the two shoulders; obviously the trough appeared at 670 nm, then surged to 36% at 700 nm. The reflectance of Platygyra daeda was between 6% and 16% with no obvious peak and trough. The reflectance values were relatively lower around 6% near 400 similar to 420 nm, increased sharply to about 15% with large characteristic peaks near 486 nm, at 486, 577, 607 and 650 nm there were four distinct peaks; with 607 nm as the main peak, 577 and 650 nm were the two shoulders; a significant trough appeared near 415 nm, and a less obvious trough appeared at 667 nm, then the reflectance increased significantly to about 37% at 700 nm. Derivative analysis results showed that the distinguishable bands of Turbinaria peltata and Platygyra daeda were as follows: first order derivatives are mainly in 483.7 similar to 492.6, 496.2 similar to 500 and 533.5 similar to 540.5 nm bands. The second order derivatives are mainly in 414 similar to 422.7, 499.4 similar to 504, 520.2 similar to 523.3, 534.2 similar to 536.6, 557.5 similar to 561 and 671.8 similar to 675 nm bands. The fourth order derivatives are mainly in 414 similar to 417.6, 427.4 similar to 430.3, 433.4 similar to 436.5, 452.3 similar to 455.5 and 657.1 similar to 659.1 nm.
KeywordLu Huitou Sanya Bay Platygyra daeda Turbinaria peltata Reflectance spectrum
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Trop Marine Bioresources & Ecol, Guangzhou 510301, Guangdong, Peoples R China
2.Natl Expt Stn Trop Marine Biol, Sanya 572000, Peoples R China
3.Shandong Jining 1 Peoples Hosp, Jining 272111, Peoples R China
4.Chinese Acad Sci, Sanya Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
Recommended Citation
GB/T 7714
Chen Yong-qiang,Chen Biao,Lei Xin-ming,et al. Reflectance Analysis of Turbinaria peltata and Platygyra daeda in Luhuitou Sanya Bay[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2019,39(3):873, 876.
APA Chen Yong-qiang,Chen Biao,Lei Xin-ming,Xie Qiang,&Huang Hui.(2019).Reflectance Analysis of Turbinaria peltata and Platygyra daeda in Luhuitou Sanya Bay.SPECTROSCOPY AND SPECTRAL ANALYSIS,39(3),873.
MLA Chen Yong-qiang,et al."Reflectance Analysis of Turbinaria peltata and Platygyra daeda in Luhuitou Sanya Bay".SPECTROSCOPY AND SPECTRAL ANALYSIS 39.3(2019):873.
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