Remote Sensing Inversion of Salinization Degree Distribution and Analysis of Its Influencing Factors in an Arid Irrigated District

Author:

Li Shuoyang123ORCID,Yang Guiyu23,Chang Cui234,Wang Hao23,Zhang Hongling5,Zhang Na5,Peng Zhigong23,Song Yaomingqi234

Affiliation:

1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China

2. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100038, China

3. China Institute of Water Resources and Hydropower Research, Beijing 100038, China

4. School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China

5. Ningxia Institute of Water Resources Research, Yinchuan 750021, China

Abstract

Salinization is one of the significant factors that impede agricultural development, threaten ecological security, and hinder sustainable development. This study successfully achieved precise and expeditious identification of salinization grades by integrating optical satellite data with other geospatial information. It effectively enhanced the accuracy of salinization inversion, with a recognition rate of 85.34%. The salinization in the Hexi irrigation area showed a decreasing trend from 2014 to 2023, with no and slight salinization increasing by 8.37% and 3.54%, while moderate and severe salinization decreased by 17.23% and 19.11%. This was mainly due to changes in hydrological processes, shown by a 5.6% and 6.8% decrease in water diversion and drainage, and a roughly 0.45 m rise in groundwater depth. Through the analysis of the relationship between salinization and groundwater depth, it is found that the further north the area is, the more severe the salinization. And the shallower the groundwater depth, the more difficult it is to maintain the groundwater depth at the threshold to prevent salinization. It is primarily due to obstructed drainage in the northern region, leading to salinization. Through exploring the reasons for drainage obstruction, the causes of salinization in different regions were identified. This research aims to provide some reference for the investigation, regulation, and management of regional salinization.

Funder

the National Key Research and Development Program

Publisher

MDPI AG

Reference62 articles.

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3. FAO (2023, March 08). World Map of Salt-Affected Soils Launched at Virtual Conference. Available online: https://www.fao.org/newsroom/detail/salt-affected-soils-map-symposium/en.

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