Soil organic carbon content continuous depth distribution extraction method based on imaging spectrum

Abstract

The invention discloses a soil organic carbon content continuous depth distribution extraction method based on an imaging spectrum, and relates to the technical field of soil measurement. By processing soil complete section samples and section strip samples in sampling points of a target area, the range of the organic carbon content of the soil, line average spectral data of complete section sample imaging and spectral data of section strip sample soil are obtained, a soil organic carbon content prediction model is obtained, a continuous depth distribution curve of the organic carbon content in the soil sample is further extracted, and the distribution of the organic carbon content of the soil is further obtained. According to the technical scheme of the invention, the conversion from the soil point reflection spectrum to the planar image spectrum is realized, the defects caused by a large sampling depth interval are avoided, high-space and high-spectral-resolution soil profile refined data are provided, technical support is provided for obtaining the continuous depth change characteristics of soil organic carbon in the vertical direction, and the data acquisition capability is greatly improved.

Description

technical field [0001] The invention relates to the technical field of soil measurement, in particular to a method for extracting continuous depth distribution of soil organic carbon content based on imaging spectrum. Background technique [0002] Soil is the largest organic carbon pool in terrestrial ecosystems. It is estimated that the global soil organic carbon storage is about 1500Pg, twice that of the atmospheric carbon pool and 2 to 4 times that of terrestrial vegetation. The resulting climate change has a huge impact on the human living environment and sustainable socio-economic development. It has become an effective measure with medium and long-term benefits to reduce the carbon dioxide content in the atmosphere by increasing the fixation of soil organic carbon. Therefore, the study of soil organic carbon is not only an important basis for the sustainable utilization of soil resources, but also has great significance for the study of soil carbon cycle and global cli...

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Problems solved by technology

[0003] The difference in the vertical distribution pattern of soil organic carbon in the profile affects the dynamics of soil carbon, which has become an important content of soil carbon pool research in the past 10 years. The traditional method of soil organic carbon measurement has the disadvantages of long cycle, high cost, and pollutant discharge. , at the same time, the sampling method of occurrence layer / soil layer or strip sampling at a certain depth interval restricts the number of profile samples, and cannot accurately reflect the depth distribution of organic carbon, resulting in uncertainty in the estimation results of organic carbon on the profile. Although the soil reflectance spectroscopy technology has the advantages of short time, low cost, no pollution, and no damage in the measurement of organic carbon, it is still not enough to invert the continuous depth distribution characteristics of soil profiles, and cannot directly realize the spatial mapping of soil organic carbon.

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