Abstract
The dehydration cracking of saline soil is a kind of common natural phenomenon, and the cracks of saline soil will affect the satellite spectrum, and then affect the accuracy of satellite spectral inversion of electrical conductivity (EC). This study introduces the concept of crack rate (CR) to describe the crack information of saline soil, and quantifies the influence of saline soil crack on the EC of satellite spectral inversion. In 2014 and 2020, the satellite-ground synchronous observation experiments of soda-type inland saline soil and coastal chlorinated-type saline soil were carried out, and the CR of surface cracked saline soil was extracted by an image processing algorithm. For the saline soil spectrum data, the correlation analysis method is used to establish the best band combination that characterizes the relationship between the different saline soil spectrum data and salinity, and the EC inversion model is established using the BP neural network method. The results show that: after the CR is introduced, the determination coefficient (R2) for the EC of soda-type saline soil satellite spectral inversion increased from 0.59 to 0.67, with an increase of 14.42%, and the mean square error (MSE) reduced from 0.20 to 0.16, with a decrease of 19.49%. The R2 for the EC of coastal chlorinated-type saline soil satellite spectral inversion increased from 0.64 to 0.75, an increase of 17.73%, and the MSE decreased from 0.16 to 0.12, a decrease of 25.15%. The study proved the influence of the cracks in the saline soil on the satellite spectrum and provided a new way to improve the accuracy of the satellite spectrum inversion of the EC of the cracked saline soil.
Highlights
Soil salinization is a serious natural environmental disaster and it is the main cause of soil desertification
The SD and coefficient of variation (CV) were 0.92% and 50.83%, respectively, which indicated that the degree of salinization in the sampling area was moderately discrete, but the variability was large
In order to reduce the influence of saline soil cracking on satellite inversion and improve the accuracy of satellite inversion of saline soil, in this study, the concept of soil crack rate (CR) was first proposed to describe the crack information of saline soil, and two different types of saline soil were selected for validation
Summary
Soil salinization is a serious natural environmental disaster and it is the main cause of soil desertification. In arid and semi-arid areas of irrigated farmland grassland and coastal wetlands, the phenomenon of soil salinization is more obvious [1,2,3,4,5,6]. In order to ensure the sustainable use of land, more and more attention has been paid to the study of soil salinization [8,9,10,11,12,13,14]. Soil salinization refers to the phenomenon or process in which soluble salts accumulate on the soil surface. The soluble salts of saline soil mainly include sulfates, chlorides, carbonates and bicarbonates of sodium, potassium, calcium, and magnesium. Soil salinization leads to the abnormal growth of many type of vegetation, which poses a great threat to agriculture and ecology
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