干旱区生态环境知识资源中心(Arid): Derivation of salt content in salinized soil from hyperspectral reflectance data: A case study at Minqin Oasis, Northwest China

Arid

DOI	10.1007/s40333-019-0091-9
	Derivation of salt content in salinized soil from hyperspectral reflectance data: A case study at Minqin Oasis, Northwest China
	Qian Tana 1; Tsunekawa, Atsushi 1; Peng Fei 1; Masunaga, Tsugiyuki 2; Wang Tao3 ; Li Rui 4
通讯作者	Qian Tana
来源期刊	JOURNAL OF ARID LAND
ISSN	1674-6767
EISSN	2194-7783
出版年	2019
卷号	11 期号:1 页码:111-122
英文摘要	Soil salinization is a serious ecological and environmental problem because it adversely affects sustainable development worldwide, especially in arid and semi-arid regions. It is crucial and urgent that advanced technologies are used to efficiently and accurately assess the status of salinization processes. Case studies to determine the relations between particular types of salinization and their spectral reflectances are essential because of the distinctive characteristics of the reflectance spectra of particular salts. During April 2015 we collected surface soil samples (0-10 cm depth) at 64 field sites in the downstream area of Minqin Oasis in Northwest China, an area that is undergoing serious salinization. We developed a linear model for determination of salt content in soil from hyperspectral data as follows. First, we undertook chemical analysis of the soil samples to determine their soluble salt contents. We then measured the reflectance spectra of the soil samples, which we post-processed using a continuum-removed reflectance algorithm to enhance the absorption features and better discriminate subtle differences in spectral features. We applied a normalized difference salinity index to the continuum-removed hyperspectral data to obtain all possible waveband pairs. Correlation of the indices obtained for all of the waveband pairs with the wavebands corresponding to measured soil salinities showed that two wavebands centred at wavelengths of 1358 and 2382 nm had the highest sensitivity to salinity. We then applied the linear regression modelling to the data from half of the soil samples to develop a soil salinity index for the relationships between wavebands and laboratory measured soluble salt content. We used the hyperspectral data from the remaining samples to validate the model. The salt content in soil from Minqin Oasis were well produced by the model. Our results indicate that wavelengths at 1358 and 2382 nm are the optimal wavebands for monitoring the concentrations of chlorine and sulphate compounds, the predominant salts at Minqin Oasis. Our modelling provides a reference for future case studies on the use of hyperspectral data for predictive quantitative estimation of salt content in soils in arid regions. Further research is warranted on the application of this method to remotely sensed hyperspectral data to investigate its potential use for large-scale mapping of the extent and severity of soil salinity.
英文关键词	salinity index soil salt content spectral reflectance waveband pairs arid regions
类型	Article
语种	英语
国家	Japan ; Peoples R China
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000458965000010
WOS关键词	QUANTITATIVE-ANALYSIS ; NIR SPECTROSCOPY ; CLASSIFICATION ; PREDICTION ; SPECTRA ; REGION
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216776
作者单位	1.Tottori Univ, Arid Land Res Ctr, Tottori 6800001, Japan; 2.Shimane Univ, Life & Environm Sci, Matsue, Shimane 6908504, Japan; 3.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Desert & Desertificat, Lanzhou 730000, Gansu, Peoples R China; 4.Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Qian Tana,Tsunekawa, Atsushi,Peng Fei,et al. Derivation of salt content in salinized soil from hyperspectral reflectance data: A case study at Minqin Oasis, Northwest China[J],2019,11(1):111-122.
APA	Qian Tana,Tsunekawa, Atsushi,Peng Fei,Masunaga, Tsugiyuki,Wang Tao,&Li Rui.(2019).Derivation of salt content in salinized soil from hyperspectral reflectance data: A case study at Minqin Oasis, Northwest China.JOURNAL OF ARID LAND,11(1),111-122.
MLA	Qian Tana,et al."Derivation of salt content in salinized soil from hyperspectral reflectance data: A case study at Minqin Oasis, Northwest China".JOURNAL OF ARID LAND 11.1(2019):111-122.