Detection and analysis of soil water content based on experimental reflectance spectrum data

Abstract

In order to improve the yield of crops, the method of soil water content detection and analysis based on experimental reflectance spectrum data is adopted. From the four aspects of the farmland soil water detection based on reflection spectrum information, soil water content detection in farmland based on spectral absorption characteristics, remote sensing inversion of soil water content of farmland by reflectance spectra data, and soil water content detection in farmland based on near‐infrared spectroscopy, the soil water content of farmland can be analyzed. The absorption valley near 1,920 nm is the characteristic absorption valley of soil water in the black soil, which can be used to predict the water content of the black soil by the spectral characteristic parameters of the absorption valley; soil water will increase the absorption of radiation energy and reduce the overall reflectance spectra of soil. The quantitative monitoring of soil water content can be achieved by using the remote sensing model of soil water content in this paper. In the range of low soil water content, the reflectance decreases with the increase of soil water content in farmland, whereas in the range of high soil water content, it increases with the increase of soil water content in farmland. The correlation between soil water content and normalized spectral reflectance is positive and negative correlation and mainly negative correlation. The method can detect soil water content in farmland under extreme conditions of different texture, soil water, salinity, and organic matter. It is an effective method for soil water content detection.

Capabilities of Hyperspectral Remote Sensing Data to Detect Soil Salinity

“…Three spectral absorption concave features were denoted around 1400 and 1900 and 2200 nm. According to several researchers Fan 2020 andDas et al 2021) the first two absorption features are linked to the water content, while the feature around (2200 nm) is related to the OHgroups in soil clay and organic matter contents (Ben-Dor 2002, Sun et al 2018, Angelopoulou et al 2020v Wang et al 2021. These concave absorption features increase with increasing ECe (salinity).…”

Effects of biochar addition on nitrous oxide emission during soil freeze–thaw cycles

“…Soil moisture controls the emission of N 2 O mainly by regulating the content of soil oxygen (O 2 ) and thereby affects the transformation of denitrification and nitrification processes ( Li et al, 2021 ). The flooding conditions with high water content in soil reduced O 2 diffusion and formed anoxic or anaerobic environments, which are conducive to denitrification ( Ma and Fan, 2020 ). However, in this study, there was no significant difference in the abundance of functional genes related to nitrification and denitrification processes.…”

Soil Quality Evaluation Based on A Minimum Data Set (MDS)—A Case Study of Tieling County, Northeast China

“…For the analysis and determination of common physical and chemical soil property indicators, we referred to soil agricultural chemical analysis and the following references; a total of 22 physical, chemical, and metal pollution indicators were measured. Soil bulk density (BD) was determined by the ring tool method [28]. Soil water content (SWC) was determined by the drying method [29].…”