【摘要】：利用ASD Field Spec 4便攜式快速掃描分光輻射光譜儀,對采自吉林省長白山地區(qū)粗面巖質(zhì)火山碎屑物發(fā)育的土壤進行光譜反射率測定,分析其光譜特征;對土壤原始光譜反射率進行一階微分、二階微分、倒數(shù)的微分、倒數(shù)的對數(shù)的一階微分和倒數(shù)的對數(shù)的二階微分等五種數(shù)學(xué)處理,并應(yīng)用多元逐步回歸分析建立土壤有機質(zhì)含量的高光譜預(yù)測模型。研究表明:土壤有機質(zhì)含量與原始光譜反射率在565~675 nm波段內(nèi)呈顯著負相關(guān);一階微分光譜在415 nm、445~605 nm波段內(nèi)與土壤有機質(zhì)含量呈極顯著負相關(guān),在705~985 nm、1015~1265 nm波段內(nèi)呈極顯著正相關(guān),在865 nm波段處相關(guān)系數(shù)達到極大值0.87;建立的土壤有機質(zhì)多元逐步線性回歸預(yù)測模型中,以一階微分模型為最優(yōu),R2為0.954,可用于粗面巖質(zhì)火山碎屑物發(fā)育土壤有機質(zhì)含量的快速測定。
[Abstract]:The spectral reflectance of the soils developed from coarse rock pyroclastic materials in Changbai Mountain area of Jilin Province was measured by ASD Field Spec 4 portable rapid scanning spectroscopic spectrometer and its spectral characteristics were analyzed. The first order differential, the second order differential, the first order differential of the logarithm of the reciprocal and the second order differential of the logarithm of the reciprocal are used to deal with the original spectral reflectivity of the soil. The hyperspectral prediction model of soil organic matter content was established by multiple stepwise regression analysis. The results showed that the soil organic matter content had a significant negative correlation with the original spectral reflectance in the wavelength of 565 ~ 675 nm, the first order differential spectrum had a very significant negative correlation with the soil organic matter content in the 415 nm,445~605 nm band, and a very significant positive correlation between the original spectral reflectance and the soil organic matter content in the 705 ~ 985 nm,1015~1265 nm band. The correlation coefficient reached the maximum of 0.87 at the band of 865 nm, and the multiple stepwise linear regression prediction model of soil organic matter was established. Using the first order differential model as the optimal R ~ 2 = 0.954, it can be used for the rapid determination of organic matter content in coarse rock pyroclastic soils.
【作者單位】： 沈陽農(nóng)業(yè)大學(xué)土地與環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金項目(41171172)資助
【分類號】：S153.6

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