The Effect of Autumn Irrigation on the Water, Heat, and Salt Transport in Seasonally Frozen Soils Under Varying Groundwater Levels

Water, Journal Year: 2025, Volume and Issue: 17(7), P. 1049 - 1049

Published: April 2, 2025

Seasonal freeze–thaw irrigation areas face challenges of soil salinization and water scarcity, requiring a deep understanding dynamics under the interaction between groundwater. An in situ lysimeter experiment was conducted winters 2020–2021 2023–2024 to investigate effects autumn (AI) timing (late AI late November icing early December) quota (0, 35, 135, 270 mm) on water, heat, salt transport varying groundwater levels Hetao Irrigation District, Northwest China. Results showed that had strong short-term effect depth there significant negative correlation air temperature monthly scale. The during were key factors utilizing “refrigerator effect”—where pre-cooled by frozen layer accelerates freezing—to regulate cycles. drastic reduction consumption lowered level, highlighting as dominant driver dynamics. Thus, with low (35 can optimize use (water saving 77% compared traditional 150 while maintaining moisture (an increase 17.4% storage) salinity control (a decrease 41.6% root zone (0–40 cm) through effect”, demonstrating its potential for sustainable water-scarce cold regions.

Language: Английский

Influence of Groundwater Depth on Salt Migration and Maize Growth in the Typical Irrigation Area

Agronomy, Journal Year: 2025, Volume and Issue: 15(5), P. 1021 - 1021

Published: April 24, 2025

Groundwater depth has a significant impact on salinization in irrigated areas. In this study, different groundwater depths were controlled via pit tests and we conducted with (DGWs) to investigate the relationship between irrigation water volume salt migration during crop growth period, as well influence of DGW maize yield. The aim study was determine an appropriate for Hetao Irrigation District, largest area Asia, under dual goals conservation control. results showed that upward replenishment 179.60 mm, 139.17 119.98 68.62 48.38 mm each respective DGW, i.e., negatively correlated period. Soil electrical conductivity (EC) exponentially related DGW. For DGWs > 1.75 m, surface soil EC decreased significantly exhibited less variation Moreover, desalination rate after improved at values 2.00 m 2.25 m. Shallow resulted increased evapotranspiration intensified stress, which reduced use efficiency. To reduce resource waste stress crops, suggest 2.00~2.25 is more suitable development. These provide reference determining salinized

Language: Английский