Field-derived spectra of salinized soils and vegetation as indicators of irrigation-induced soil salinization
Field-derived spectra of salinized soils and vegetation as indicators of irrigation-induced soil salinization
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DOI：
10.1016/s0034-4257(01)00321-2
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发表时间：
2002-06-01
影响因子：
13.5
通讯作者：
Taylor, GR
中科院分区：
文献类型：
--
作者：
Dehaan, RL;Taylor, GR
盐渍化是澳大利亚墨累-达令盆地土壤退化的主要原因。本研究的目的是评估实用的实地衍生光谱的盐渍土和相关植被的特征和映射的空间分布灌溉引起的土壤盐渍化。使用FieldSpee FR手持式光谱仪测量一系列盐碱化土壤和相关植被的光谱。评估了使用高光谱（HyMap）图像绘制实地光谱的策略，并采用了连续去除光谱特征拟合（SFF）方法。由海蓬子、海蓬子和原生草物种组成的植被的野外光谱也是盐碱化的有用指标：然而，它们的缺失不一定是健康土壤的全部指标。使用SFF方法创建的分布图和有限的波长范围内的外地衍生的光谱提供了所有准确的记录，在图像采集时的植被和土壤盐渍化指标的分布。盐渍化土壤和植被指标类图显示了与地面地球物理调查绘制的土壤盐渍化类似的空间分布。(C)2002年爱思唯尔科学公司All rights reserved.
Salinization is a major cause of soil degradation ill the Murray-Darling Basin of Australia. The objective of this research is to evaluate the utility of field-derived spectra of saline soils and related vegetation for characterizing and mapping the spatial distribution of irrigation-induced soil salinization. A FieldSpee FR hand-held spectrometer was used to measure the spectra of a range of salinized soils and associated vegetation. Strategies for mapping field-derived spectra using hyperspectral (HyMap) imagery were assessed, and a continuum-removed Spectral-Feature-Fitting (SFF) approach adopted. Field-derived spectra of the vegetation comprising of samphire, sea blite, and native grass species are also useful indicators of salinization: however, their absence is not necessarily ail indicator of healthy soils. Distribution maps created using the SFF method and a restricted wavelength range of field-derived spectra provide ail accurate record of the distribution of both vegetation and soil indicators of salinization at the time of image acquisition. Salinized soil and vegetation indicator class maps show a similar spatial distribution to soil salinization as mapped by ground-based geophysical surveys. (C) 2002 Elsevier Science Inc. All rights reserved.