Exploring the Water-Soil-Crop Dynamic Process and Water Use Efficiency of Typical Irrigation Units in the Agro-Pastoral Ecotone of Northern China
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View abstract on PubMed
Summary
This summary is machine-generated.This study used the DSSAT model to analyze water use for potato, oat, alfalfa, and sunflower crops in Inner Mongolia. Potatoes demonstrated the highest water productivity, suggesting they are best suited for sustainable irrigation in the region.
Area Of Science
- Agricultural Science
- Hydrology
- Crop Modeling
Background
- Groundwater is the primary water source in China's agro-pastoral ecotone, but its overuse for irrigation is causing declining water levels.
- Understanding water transport, cycle mechanisms, and water use efficiency is crucial for sustainable irrigation in this water-scarce region.
Purpose Of The Study
- To explore crop growth, soil water dynamics, water balance, and water use efficiency for key crops (potato, oat, alfalfa, sunflower) in a typical irrigation area.
- To assess the accuracy of the DSSAT model for simulating these processes.
- To provide recommendations for optimizing irrigation strategies and crop selection for water conservation.
Main Methods
- In situ experimental observations and daily meteorological data from 2022-2023 were collected.
- The Decision Support System for Agrotechnology Transfer (DSSAT) model was utilized to simulate crop growth and water dynamics.
- Model accuracy was validated using standard statistical metrics (ARE, nRMSE, R²).
Main Results
- The DSSAT model showed high accuracy (ARE < 10%, nRMSE/% < 10%, R² ≥ 0.85).
- Soil moisture consumption peaked during the rapid growth stage for all studied crops.
- Potatoes exhibited the highest water use efficiency (WUE) and irrigation water use efficiency (IWUE), followed by alfalfa, sunflower, and oats.
Conclusions
- Reducing irrigation water can decrease ineffective water consumption.
- Potatoes are recommended for extensive cultivation due to their superior water productivity.
- Alfalfa should be planted appropriately, while oats and sunflowers should be cultivated less to enhance water resource management in the region.
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