土样处理方式对室内土壤高光谱测试稳定性影响探讨

Treatment Effects on Soil Hyperspectral Stability in Laboratory Test

基于荷兰Avantes公司的Avaspec-2048×14型号地物光谱仪对180份土样高光谱数据进行了实测,通过方差分析,探讨了400~1000 nm波段范围内,不同土样处理方式(土样表面处理方式及粒径大小)对室内土壤高光谱重复测试稳定性的影响。结果显示,四种粒径(分别过2、1、0.25和0.15 mm筛)土样光谱测试的稳定性,均表现为表面刮平处理方式优于压平与摇平处理方式;在土样表面刮平处理方式中,过1 mm筛的土样光谱测试稳定性优于过2、0.25和0.15 mm筛土样。综合分析认为,过1 mm筛,且表面为刮平处理方式土样高光谱测试稳定性效果较好。

The hyperspectral data of 180 soil samples were measured based on Avaspec-2048 × 14 spectrometer of Dutch Avantes Inc. We explored treatment effects on soil samples(including soil sample surface treatments and particle size) on the soil hyperspectral stability of laboratory repeating test in the range of 400 ~ 1000 nm bands through the analysis of variance. The results showed that the slicking treatment was superior to planishing and shaking treatment in testing the hyperspectral stability of four kinds of particle size(separately through 2 mm, 1 mm, 0.25 mm and 0.15 mm sieves). After slicking treatment, stability of soil sample spectrum test of 1 mm sieve was better than 2mm, 0.25 mm and 0.15 mm. Comprehensive analysis suggested that sieving through 1 mm combined with slicking treatment was recommended as the optimal method for soil hyperspectral test.