基于因子分析的黑土反射光谱特征的主要影响因素

Principle Influence Factors for Hyperspectral Reflectance on Black-soil based on Factorial Analysis

为明确土壤反射光谱特征的主要影响因素、避免非相关土壤理化参数的反射光谱模型,以单一土壤类型黑土为研究对象,利用数理统计与因子分析方法分析影响黑土反射光谱特征的主要土壤理化参数。结果表明:1)土壤理化参数与黑土高光谱反射率的相关系数随波长变化呈4种模式,分别为有机质控制型、水分控制型、正相关型和不相关型,有机质与水分是黑土反射光谱特征的主导因素;2)黑土高光谱反射率的4个主要公因子分别对应水分响应波段(2 210nm)、可见光有机质响应波段(485nm)、光谱曲线快速上升阶段(1 290nm)和可见光范围噪声较多波段(360nm);3)有机质、pH、全氮、全磷可以利用黑土反射光谱特征进行预测。

To identify the principle influence factors for soil spectral reflectance characteristics for its reflection spectrum model,and to avoid other non-relevant physicochemical properties,a single soil type, black-soil was analyzed by statistics and factorial analysis.The results showed that there were 4 types of the correlation coefficients between black-soil reflectance and soil properties,including organic matter control type,moisture control type,positive correlation type,and non-correlation type,among them,soil organic matter and moisture were the dominant factors.The four common factors derived from black-soil reflectance were moisture response bands （2210 nm）,organic matter response bands （485 nm）,rapid rising bands （1290 nm）,and noise bands （360 nm）.It could be concluded that soil organic matter,pH, total N,and total P be predicted by black-soil hyperspectral reflectance.