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| Hyperspectral Characteristics of Coastal Saline Soil with Visible/near Infrared Spectroscopy |
Xiaoguang Zhang1,2( ),Zixuan Jiang1,Fanchang Kong1 |
1. College of Resource and Environment, Qingdao Agricultural University, Qingdao 266109, China
2. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China |
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Abstract Soil spectrum is the physical basis of monitoring with remote sensing, the research of saline soil spectral characteristics is of great significance for monitoring soil salinization. In this paper, coastal saline soil took from the Yellow River delta was selected as the research object. Through field sampled and indoor processing, Indoor spectra（350~1 100 nm） of coastal saline soil were measured. The characteristics of hyperspectral reflectance and absorption with different salinity were studied after eliminating the influence of moisture and soil texture, and then soil spectral prediction model was built. The results show that the reflection characteristics of spectra and the absorption peak could be decrypted more accurate and effective after smoothed spectral curves. The soil spectral curves with different salinity degree were similar and parallel in shape, while there were greatly differences among them. no obvious rule. After continuum removal was applied to soil curves, the absorption of light saline soil was minimal at 490 nm. Absorption of severe saline soil was more intense in 760~920 nm. The original spectrum couldn’t predict soil salinization information, while the transformation of second-order differential could improve sensitivity of spectral data, and spectral prediction model could basically meet prediction requirements.
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Received: 24 June 2018
Published: 16 October 2019
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2019, Vol. 34 
