Effects of Ecological Water Conveyance on Soil Salinization in the Shiyang River Basin’s Terminal Lake—Qingtu Lake—Area

Jianxia Yang, Jun Zhao (), Guofeng Zhu, Yuanyuan Wen, Yanqiang Wang, Jialiang Liu and Zhihui Yang
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Jianxia Yang: College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China
Jun Zhao: College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China
Guofeng Zhu: College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China
Yuanyuan Wen: College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China
Yanqiang Wang: College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China
Jialiang Liu: College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China
Zhihui Yang: College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China

Sustainability, 2022, vol. 14, issue 16, 1-11

Abstract: (1) Background: Recently, secondary soil salinization has frequently occurred in ecological water conveyance and irrigation areas. Therefore, monitoring the information on soil salinization in the conveyance irrigation area and analyzing the change process of soil salinization are of great significance to both environmental improvement and salinization management. (2) Methods: This study takes the Shiyang River’s terminal lake—Qingtu Lake—and its surroundings as the research area. The salinization index was extracted by remote sensing data and methods, and a comprehensive salinization model ( CSI ) was established. Firstly, the spatial distribution regular of soil salinization, since ecological water conveyance was explored, and the change trends in soil salinization were analyzed. Secondly, the relationship between the change characteristics of soil salinization and groundwater, water area changes and land use types were analyzed. (3) Results: The Kappa coefficient between the soil salinization extracted by CSI and the measured data reached 0.703, and CSI can accurately monitor soil salinization information. From 2011 to 2020, the non-salinized land increased by 2.1%, mild and moderate salinization decreased by 5.7% and 3.9%, respectively, and severe salinization increased by 7.5%. The salinization in the lake area showed a decreasing trend, and the periphery of the lake area showed an increasing trend. Groundwater, water area changes and land use type have certain influences on soil salinization in the study area. (4) Conclusion: Since ecological water conveyance, the total proportion of soil salinized area in Qingtu Lake and its surrounding areas has not changed much, but there are certain changes between different grades of salinized land. The areas with changes to the level of salinization are mainly shallow, unstable water areas, saline–alkali land, wetlands and sandy land, and there are secondary salinization problems in these areas.

Keywords: ecological water conveyance; soil salinization; secondary salinization; ecological remote sensing; arid inland river basin (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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