| 引用本文: | 许海婷,黄娟萍,朱永华,等.淮北平原冬小麦土壤含水率时空特征分析[J].灌溉排水学报,2021,(7):1-8. |
| XU Haiting,HUANG Juanping,ZHU Yonghua,et al.淮北平原冬小麦土壤含水率时空特征分析[J].灌溉排水学报,2021,(7):1-8. |
|
| 摘要: |
| 【目的】探讨淮北平原冬小麦生育期内土壤水分的时空变化特征，为冬小麦灌溉和田间水分管理提供科学依据。【方法】基于1992—2018年淮北平原砂姜黑土区的土壤含水率数据和适宜土壤含水率阈值，采用Mann-Kendall检验法（M-K检验法）、滑动T检验法、克里金插值法等方法分析了淮北平原冬小麦生育期内土壤含水率时空变化规律。【结果】①冬小麦全生育期10、20 cm土层深度含水率呈下降趋势，而50 cm含水率则呈上升趋势；10、20和50 cm的土壤含水率未发生突变，其变化处于正常波动范围。②冬小麦生育期内，拔节—抽穗阶段、抽穗—乳熟阶段和乳熟—成熟阶段的土壤含水率低于适宜含水率下限值出现的概率分别为38.5%、46.2%和46.2%，不利于冬小麦生长发育；而返青—拔节阶段土壤含水率均高于适宜含水率下限值，出现干旱胁迫的可能性较低。③在空间分布上，冬小麦全生育期表层土壤含水率西南部最高，中部较低，而中层50 cm则呈从南向北减少的整体态势。④在拔节—抽穗阶段，土壤含水率的低值区出现在蚌埠和蒙城的概率为45.5%和50.0%，而在抽穗—乳熟阶段其概率分别为62.0%和38.1%。【结论】未来淮北平原表层土壤含水率可能呈下降趋势，冬小麦生长受干旱胁迫的可能性较大，蚌埠和蒙城地区应加强冬小麦的灌溉。 |
| 关键词: 冬小麦；适宜土壤含水率阈值；时空变化；砂姜黑土；淮北平原 |
| DOI：10.13522/j.cnki.ggps.2020424 |
| 分类号: |
| 基金项目: |
|
| Spatiotemporal Variation of Soil Water Content over Winter Wheat Fields in Huaibei Plain |
|
XU Haiting, HUANG Juanping, ZHU Yonghua, LYU Haishen, LIU Yong, WANG Zhenlong
|
|
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
|
| 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 |
