土壤含水量、容重、光谱反射率之间相伴变化关系研究

Research on Concomitant Changes Relationship among Soil Water Content, Bulk Density, Spectral Reflectivity

[目的]研究土壤含水量变化对容重变化的定量化影响及其与光谱反射率的关系,构建相关模型,为近红外线光谱连续准确监测土壤含水量提供科学依据。[方法]以湖北省黄棕壤、水稻土、潮土为供试土壤,用环刀采样,在土壤脱水干燥过程中,用微型光纤光谱反射仪等连续同步测定土壤质量含水量、容重、土壤体积含水量和光谱反射率的变化。[结果]探讨了土壤含水量～容重变化的关系及相关模型,构建了反映土壤容重变化的土壤体积含水量与土壤光谱反射率的指数关系模型。[结论]所建模型拟合效果好,物理意义明确,形式简单,变量关系清晰。

[ Objective] The quantification influence of soil moisture change on bulk density change and its relationship with spectrum reflectiv- ity were studied. And the relevant model was constructed to provide scientific basis of near infrared spectrum continuous accurate monitoring soil water content. [ Method] Yellow brown soil, rice soil, Chao soil in Hubei were taken as testing soils. Annulus knife was used to sample. During the process of soil dehydration, soil weight water content, soil bulk density, soil volume water content and spectral reflectivity changes were tested continuously using miniature fiber spectral reflection meter etc. [ Result] The soil water content-density change relation and related model were discussed. Exponent relation model reflecting soil volume water content and soil spectral reflectivity was constructed. [ Conclu- sion] The models had good fitting effect, clear physical meaning, simple form, and clear variable relationship.