| Cite this article: | 刘福全,杜崇,韩旭,等.基于3S技术的大庆地区土壤盐渍化时空变化分析[J].灌溉排水学报,0,():-. |
| liufuquan,duchong,hanxu,et al.基于3S技术的大庆地区土壤盐渍化时空变化分析[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Spatial-temporal variation of soil salinization in Daqing based on 3S technology |
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liufuquan1, duchong1, hanxu1, li rui1, huzihao1, guoJiatong2
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1.Heilongjiang University;2.Liaoning Shifosi Reservoir Administration Co., LTD
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| Abstract: |
| Abstract :【Objective】To monitor spatial-temporal variation of soil salinization in Daqing area, and to provide reference for soil salinity monitoring. 【Method】 The soil salinization inversion model was constructed by using the method of multiple stepwise regression analysis, and the salinization grade distribution map was drawn by Arcgis. The spatial-temporal characteristics of soil salinization from 2001 to 2021 were analyzed.【Result】①The correlation between soil salt content and reflectance was stronger in surface layer (0~10 cm), and the correlation also improved after mathematical transformation of reflectance. ②The inversion model constructed by logarithm of B1 band, index of B7 band and index of B7 band has good accuracy and stability, R2=0.842,RMSE=0.290, which can be used as the inversion model in the study area. ③From 2001 to 2021, the area of mild, moderate and salinized soil in the study area increased first and then decreased, while the area of severe salinization decreased first, then increased and then decreased, By 2021, the total area of salinization in the study area was 102,262 hm2.【Conclusion】In the past 20 years, the salinization area in Daqing region has increased firstly and then decreased, especially the salinization area in daqing urban area is the largest. In the future, we should focus on monitoring other severe salinization counties in Daqing region to ensure that the degree of salinization does not continue to increase. |
| Key words: Daqing area; soil salinity; remote sensing; change of time and space |
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