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通过分析湖南、浙江和福建三省不同氧化铁和有机质含量共253个土样的光谱数据,研究了氧化铁对有机质光谱特征及定量反演的影响。结果表明:氧化铁的光谱特征波段为600—1400 nm;氧化铁含量小于20 g/kg时对有机质的光谱信息没有影响,含量在20—30 g/kg时,对有机质可见光波段光谱信息的表现有影响,近红外波段的影响不大,含量大于30 g/kg时,氧化铁会掩盖有机质的光谱信息;氧化铁与有机质的比值小于0.726时对有机质的光谱信息没有影响,比值为1.05—2时,对有机质400—1300 nm波段光谱信息的表现有影响,1300—2400 nm波段的影响不大,比值大于2.21时,氧化铁会完全掩盖有机质的光谱信息;氧化铁对有机质的光谱定量反演有影响,随氧化铁含量的增加或氧化铁含量与有机质含量比值的增大,模型的稳定性与预测能力有所降低,但氧化铁含量小于20g/kg、氧化铁含量与有机质含量比值小于2.0时,氧化铁的影响不明显。
By analyzing the spectral data of 253 soil samples with different contents of iron oxide and organic matter in three provinces of Hunan, Zhejiang and Fujian provinces, the effects of iron oxide on the spectral characteristics and quantitative inversion of organic matter were studied. The results showed that the characteristic wavelength range of ferric oxide was 600-1400 nm. When the content of iron oxide was less than 20 g / kg, the spectral information of organic matter was not affected. When the content was 20-30 g / kg, When the content of iron oxide and organic matter is less than 0.726, there is no effect on the spectral information of organic matter, the ratio is 1.05-2 , It affected the spectral information of 400-1300 nm band in organic matter, and had little effect in the 1300-2400 nm band. When the ratio was more than 2.21, the iron oxide completely obscured the spectral information of the organic matter. Spectral quantitative inversion of the organic matter by iron oxide , With the increase of iron oxide content or the ratio of iron oxide content to organic matter content, the stability and predictive ability of the model are reduced. However, the content of iron oxide is less than 20g / kg and the ratio of iron oxide to organic matter is less than 2.0 When the impact of iron oxide is not obvious.