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| DOI：10.13522/j.cnki.ggps.2020424 |
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| Spatiotemporal Variation of Soil Water Content over Winter Wheat Fields in Huaibei Plain |
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XU Haiting, HUANG Juanping, ZHU Yonghua, LYU Haishen, LIU Yong, WANG Zhenlong
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1.College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China; 2.Fujian Hydrology and Water Resources Bureau Minjiang Estuary Hydrology Experimental Station, Fuzhou 350000, China; 3.Key Laboratory on Water Conservancy and Water Resources of Anhui Province, Anhui & Huaihe River Institute of Hydraulic Research, Bengbu 233000, China
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| Abstract: |
| 【Objective】Soil water controls all physical and biological processes in soil and understanding its dynamics is central to improving agronomic and irrigation management. The objective of this paper is to analyze soil water variation in winter wheat fields across Huaibei plain in attempts to provide baseline data to help improve agricultural water management in this region.【Methods】Soils in the studied areas are predominantly luvisol soil and the analysis was based on soil water content measured from 1992 to 2018 over the wheat fields in Huaibei plain. For each growth stage of the wheat, we set a threshold soil moisture below which the wheat was deemed to suffer water stress. Spatiotemporal change in soil water content was analyzed using the Mann-Kendall test, the sliding T-test, and the Kriging interpolation. 【Result】①Soil water content in the top 0~20 cm soil has been in decline while the water content at the depth of 50 cm has been in increase over the past few decades. Across the plain, soil water content at the depths of 10 cm, 20 cm and 50 cm did not show massive upheaval. ②The probability of soil water content dropping below the thresholds at jointing - heading stage, heading - milk ripe stage and milk ripe -ripping stage was 38.5%, 46.2% and 46.2% respectively. In contrast, the probability of soil water content exceeding the threshold at reviving - jointing stage was high, indicating that water stress is unlikely to occur during this stage. ③Spatially, water content in the surface soil was the highest in the southwest and the least in the middle, while soil water content at the depth of 50 cm decreases from the south to the north. ④The probability that soil water content at Bengbu and Mengcheng dropped below the threshold at the jointing - heading stage was 45.5% and 50.0% respectively, and increased to 62.0% and 38.1% respectively at the heading - milk ripe stage.【Conclusion】Soil water content measured from the past 30 years indicated that the surface soil moisture in the winter wheat field is likely to continue to decrease, making the winter wheat, especially at seedling stage, prone to water stress. Improving irrigation is hence required in the areas proximal to Bengbu and Mengcheng to safeguard their wheat production. |
| Key words: winter wheat; threshold soil moisture; spatiotemporal variation; luvisol soil; Huaibei Plain |
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