粗面岩质火山碎屑物发育土壤有机质含量的高光谱特征与建模
发布时间：2018-10-08 12:09
【摘要】：利用ASD Field Spec 4便携式快速扫描分光辐射光谱仪,对采自吉林省长白山地区粗面岩质火山碎屑物发育的土壤进行光谱反射率测定,分析其光谱特征;对土壤原始光谱反射率进行一阶微分、二阶微分、倒数的微分、倒数的对数的一阶微分和倒数的对数的二阶微分等五种数学处理,并应用多元逐步回归分析建立土壤有机质含量的高光谱预测模型。研究表明:土壤有机质含量与原始光谱反射率在565~675 nm波段内呈显著负相关;一阶微分光谱在415 nm、445~605 nm波段内与土壤有机质含量呈极显著负相关,在705~985 nm、1015~1265 nm波段内呈极显著正相关,在865 nm波段处相关系数达到极大值0.87;建立的土壤有机质多元逐步线性回归预测模型中,以一阶微分模型为最优,R2为0.954,可用于粗面岩质火山碎屑物发育土壤有机质含量的快速测定。
[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.
【作者单位】： 沈阳农业大学土地与环境学院;
【基金】：国家自然科学基金项目(41171172)资助
【分类号】：S153.6
本文编号：2256692
[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.
【作者单位】： 沈阳农业大学土地与环境学院;
【基金】：国家自然科学基金项目(41171172)资助
【分类号】：S153.6
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