Spectral reflectance characteristics of typical halophytes in the oasis salinization-desert zone on middle reaches of Tarim River, China

doi:10.3724/SP.J.1258.2012.00607

Abstract

Abstract:

Aims As one of the main components of terrestrial ecosystems, halophytes play a key role in maintaining arid zone ecosystem balance. Remote sensing has potential for monitoring halophytes in large areas. However, few studies on the spectral properties of halophytes are available. The spectral features of halophytes on the ground provide an important basis for remote sensing applications.

Methods This study used the FieldSpec Pro FR portable spectroscope to record ground reflectance of halophytes, using typical halophytes in the salinization-desert zone of a delta oasis in Weigan-Kuqa River as an example. We first analyzed the data noise characteristic of the spectrum. The noise was removed using the Percentile Filter method. We employed differential spectrum technology to reduce the influence of environmental background. Second, we extracted parameters of spectral absorption features for typical halophytes: Halostachys caspica, Halocnemum strobilaceum, Alhagi sparsifolia, Nitrarria sibirica, Tamarix ramosissima, Karelinia caspia and Phragmites australis. Third, we processed spectral reflectance curves of halophytes using a normalization method.

Important findings The wave troughs/wave length positions of euhalophyte, secretohalophyte and pseudohalophy are very similar, indicating that halophytes have similar absorption band characteristics. Elimination of the elements of noises and deflections caused by different scanning conditions such as soil background improved the recognition accuracy of halophytes. We ultimately identified nine optimal spectral bands, i.e., 510, 550, 690, 730, 950, 1150, 1210, 1290 and 1310 nm, that appeared to contain majority of the salinization-desert zone information of the multispectral signatures. The nine bands can be used to differentiate salinization-desert zone halophytes types. The results not only provide a scientific basis for hyperspectral remote sensing image processing, but also supply references for the identification and classification of halophytes using remote sensing technology.

Key words: delta oasis of Weigan-Kuqa River, halophytes, salinization-desert zone, spectral characteristic

ZHANG Fei, TASHPOLAT · Tiyip, DING Jian-Li, MAMAT · Sawut, GUI Dong-Wei. Spectral reflectance characteristics of typical halophytes in the oasis salinization-desert zone on middle reaches of Tarim River, China[J]. Chin J Plant Ecol, 2012, 36(7): 607-617.

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URL: https://www.plant-ecology.com/EN/10.3724/SP.J.1258.2012.00607

https://www.plant-ecology.com/EN/Y2012/V36/I7/607

Figures/Tables 10

References 27

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植物名称 Plant name	盐生植物类型 Halophyte type	植物生境 Plant habitat	平均高度 Average height (m)	生长型 Growth form	光谱数 Spectra number
柽柳 Tamarix ramosissima	泌盐盐生植物 Secretohalophyte	中度盐渍地, 重度盐渍地 Moderate and severe saline land	1.8	灌丛 Shrub	3
盐节木 Halocnemum strobilaceum	稀盐盐生植物 Euhalophyte	重度盐渍地 Severe saline land	1.2	小灌木 Undershrub	3
花花柴 Karelinia caspia	拒盐盐生植物 Pseudohalophy	轻度盐渍地, 中度盐渍地 Slight and moderate saline land	0.7	草本 Herb	3
骆驼刺 Alhagi sparsifolia	拒盐盐生植物 Pseudohalophy	轻度盐渍地, 中度盐渍地 Slight and moderate saline land	0.8	草本 Herb	3
白刺 Nitrarria sibirica	稀盐盐生植物 Euhalophyte	中度盐渍地 Moderate saline land	0.9	灌丛 Shrub	3
芦苇 Phragmites australis	拒盐盐生植物 Pseudohalophy	轻度盐渍地 Slight saline land	1.5	草本 Herb	3
盐穗木 Halostachys caspica	稀盐盐生植物 Euhalophyte	重度盐渍地 Severe saline land	0.8	半灌木 Subshrub	3

植物名称 Plant name	盐生植物类型 Halophyte type	植物生境 Plant habitat	平均高度 Average height (m)	生长型 Growth form	光谱数 Spectra number
柽柳 Tamarix ramosissima	泌盐盐生植物 Secretohalophyte	中度盐渍地, 重度盐渍地 Moderate and severe saline land	1.8	灌丛 Shrub	3
盐节木 Halocnemum strobilaceum	稀盐盐生植物 Euhalophyte	重度盐渍地 Severe saline land	1.2	小灌木 Undershrub	3
花花柴 Karelinia caspia	拒盐盐生植物 Pseudohalophy	轻度盐渍地, 中度盐渍地 Slight and moderate saline land	0.7	草本 Herb	3
骆驼刺 Alhagi sparsifolia	拒盐盐生植物 Pseudohalophy	轻度盐渍地, 中度盐渍地 Slight and moderate saline land	0.8	草本 Herb	3
白刺 Nitrarria sibirica	稀盐盐生植物 Euhalophyte	中度盐渍地 Moderate saline land	0.9	灌丛 Shrub	3
芦苇 Phragmites australis	拒盐盐生植物 Pseudohalophy	轻度盐渍地 Slight saline land	1.5	草本 Herb	3
盐穗木 Halostachys caspica	稀盐盐生植物 Euhalophyte	重度盐渍地 Severe saline land	0.8	半灌木 Subshrub	3

植物类型 Plant type	波谷波长位置 Wave trough wave length position	波谷点反射值 Wave trough reflectance	波谷宽度 Wave trough width (nm)	波谷深度 Wave trough height	波谷面积 Wave trough area	波谷斜率 Wave trough slope	波谷对称度 Wave trough symmetry	波谷SAI Wave trough SAI
1	674 nm	0.034	167	0.478	100.736	0.003 898	0.551	-3 174.500
2	676 nm	0.093	200	0.460	117.948	0.003 090	0.415	-1 320.320
3	676 nm	0.055	200	0.532	121.460	0.002 890	0.405	-2 087.450
植物类型 Plant type	波谷波长位置 Wave trough wave length position	波谷点反射值 Wave trough reflectance	波谷宽度 Wave trough width (nm)	波谷深度 Wave trough height	波谷面积 Wave trough area	波谷斜率 Wave trough slope	波谷对称度 Wave trough symmetry	波谷SAI Wave trough SAI
1	974 nm	0.756	155	0.028	3.376	-0.000 155	0.639	5.934
2	976 nm	0.680	148	0.062	6.186	-0.000 034	0.622	2.171
3	974 nm	0.688	143	0.053	6.261	-0.000 042	0.594	2.331
植物类型 Plant type	波谷波长位置 Wave trough wave length position	波谷点反射值 Wave trough reflectance	波谷宽度 Wave trough width (nm)	波谷深度 Wave trough height	波谷面积 Wave trough area	波谷斜率 Wave trough slope	波谷对称度 Wave trough symmetry	波谷SAI Wave trough SAI
1	1 194 nm	0.746	159	0.055	9.535	-0.000 541	0.447	19.361
2	1 196 nm	0.582	154	0.069	15.885	-0.000 734	0.506	30.938
3	1 198 nm	0.591	150	0.061	15.920	-0.000 747	0.493	29.465
植物类型 Plant type	波谷波长位置 Wave trough wave length position	波谷点反射值 Wave trough reflectance	波谷宽度 Wave trough width (nm)	波谷深度 Wave trough height	波谷面积 Wave trough area	波谷斜率 Wave trough slope	波谷对称度 Wave trough symmetry	波谷SAI Wave trough SAI
1	1 451 nm	0.117	397	0.348	177.075	-0.000 640	0.567	864.846
2	1 449 nm	0.118	392	0.335	176.198	-0.000 651	0.571	850.136
3	1 451 nm	0.159	396	0.383	159.246	-0.000 705	0.561	697.359
植物类型 Plant type	波谷波长位置 Wave trough wave length position	波谷点反射值 Wave trough reflectance	波谷宽度 Wave trough width (nm)	波谷深度 Wave trough height	波谷面积 Wave trough area	波谷斜率 Wave trough slope	波谷对称度 Wave trough symmetry	波谷SAI Wave trough SAI
1	1 945 nm	0.026	545	0.557	310.505	-0.000 422	0.501	4 828.731
2	1 940 nm	0.098	547	0.300	261.549	-0.000 400	0.475	1 225.265
3	1 939 nm	0.027	516	0.234	260.075	-0.000 372	0.556	3 675.148

植物类型 Plant type	波谷波长位置 Wave trough wave length position	波谷点反射值 Wave trough reflectance	波谷宽度 Wave trough width (nm)	波谷深度 Wave trough height	波谷面积 Wave trough area	波谷斜率 Wave trough slope	波谷对称度 Wave trough symmetry	波谷SAI Wave trough SAI
1	674 nm	0.034	167	0.478	100.736	0.003 898	0.551	-3 174.500
2	676 nm	0.093	200	0.460	117.948	0.003 090	0.415	-1 320.320
3	676 nm	0.055	200	0.532	121.460	0.002 890	0.405	-2 087.450
植物类型 Plant type	波谷波长位置 Wave trough wave length position	波谷点反射值 Wave trough reflectance	波谷宽度 Wave trough width (nm)	波谷深度 Wave trough height	波谷面积 Wave trough area	波谷斜率 Wave trough slope	波谷对称度 Wave trough symmetry	波谷SAI Wave trough SAI
1	974 nm	0.756	155	0.028	3.376	-0.000 155	0.639	5.934
2	976 nm	0.680	148	0.062	6.186	-0.000 034	0.622	2.171
3	974 nm	0.688	143	0.053	6.261	-0.000 042	0.594	2.331
植物类型 Plant type	波谷波长位置 Wave trough wave length position	波谷点反射值 Wave trough reflectance	波谷宽度 Wave trough width (nm)	波谷深度 Wave trough height	波谷面积 Wave trough area	波谷斜率 Wave trough slope	波谷对称度 Wave trough symmetry	波谷SAI Wave trough SAI
1	1 194 nm	0.746	159	0.055	9.535	-0.000 541	0.447	19.361
2	1 196 nm	0.582	154	0.069	15.885	-0.000 734	0.506	30.938
3	1 198 nm	0.591	150	0.061	15.920	-0.000 747	0.493	29.465
植物类型 Plant type	波谷波长位置 Wave trough wave length position	波谷点反射值 Wave trough reflectance	波谷宽度 Wave trough width (nm)	波谷深度 Wave trough height	波谷面积 Wave trough area	波谷斜率 Wave trough slope	波谷对称度 Wave trough symmetry	波谷SAI Wave trough SAI
1	1 451 nm	0.117	397	0.348	177.075	-0.000 640	0.567	864.846
2	1 449 nm	0.118	392	0.335	176.198	-0.000 651	0.571	850.136
3	1 451 nm	0.159	396	0.383	159.246	-0.000 705	0.561	697.359
植物类型 Plant type	波谷波长位置 Wave trough wave length position	波谷点反射值 Wave trough reflectance	波谷宽度 Wave trough width (nm)	波谷深度 Wave trough height	波谷面积 Wave trough area	波谷斜率 Wave trough slope	波谷对称度 Wave trough symmetry	波谷SAI Wave trough SAI
1	1 945 nm	0.026	545	0.557	310.505	-0.000 422	0.501	4 828.731
2	1 940 nm	0.098	547	0.300	261.549	-0.000 400	0.475	1 225.265
3	1 939 nm	0.027	516	0.234	260.075	-0.000 372	0.556	3 675.148