| 引用本文: | 刘潇忆,刘 超,聂锐华,等.2000—2014年黄河源水分利用效率时空变化及其影响因素[J].灌溉排水学报,2023,42(9):61-67. |
| LIU Xiaoyi,LIU Chao,NIE Ruihua,et al.2000—2014年黄河源水分利用效率时空变化及其影响因素[J].灌溉排水学报,2023,42(9):61-67. |
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| 摘要: |
| 【目的】探讨黄河源生态系统WUE的变化趋势及其影响因素。【方法】基于MODIS遥感数据定量估算了2000—2014年黄河源植被水分利用效率，并采用趋势分析和相关分析，研究了生态系统WUE时空变化特征及其对水热因子和植被因子的响应。【结果】2000—2014年黄河源WUE平均值为（0.59±0.35）gC/（m2·mm），空间上由西向东呈增加趋势，时间上呈不显著增加趋势（p>0.05）。其中，WUE显著增加区域的空间比例为30.29%，主要分布在黄河源西部和北部，覆盖类型为中、低覆盖度草地和耕地。黄河源生态系统WUE对水热因子和叶面积指数的敏感程度具有明显的空间异质性。【结论】在气候暖湿化影响下，水热和植被条件较差的中、低覆盖度草地WUE对植被改善有更高的敏感性。 |
| 关键词: 黄河源；水分利用效率；叶面积指数；降水量；气温；敏感性 |
| DOI：10.13522/j.cnki.ggps.2022191 |
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| Spatiotemporal Variation in Water Use Efficiency and Its Determinants in 2000—2014 in the Source Region of Yellow River |
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LIU Xiaoyi, LIU Chao, NIE Ruihua, JIN Zhongwu, LIU Tiegang
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1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower,
Sichuan University, Chengdu 610065, China; 2. River Department, Yangtze River Scientific Research Institute, Wuhan 430010, China
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| Abstract: |
| 【Objective】Water use efficiency (WUE) and the factors affecting its spatiotemporal variation are important in water management at catchment scale. The objective of this paper is to analyze the variations of WUE and its determinants in the source region of Yellow River (SRYR).【Method】The analysis was based on MODIS remote sensing data, from which we estimated the ecosystem WUE from 2000 to 2014 and its spatiotemporal variation, as well as the underlying drivers using trend analysis and correlation analysis.【Result】Spatially, the mean annual WUE increased from the west to the east, with an average of（0.59±0.35）gC/(m2·mm) from 2000 to 2014. Temporally, WUE did not show any decreasing or increasing trend (p>0.05). The areas that have seen a significant increase in WUE account for 30.29% of the studied region, distributing mainly in the west and north of SRYR. Areas with low and medium vegetation coverage are dominated by grassland and farmland. Spatial variation of WUE was mainly affected by hydrothermal factors and leaf area index. 【Conclusion】In the context of mediating the detrimental effects of climate warming and flooding, improving vegetation in areas with low and medium vegetation coverage is expected to enhance WUE significantly. |
| Key words: the source region of the Yellow River; water use efficiency; leaf area index; precipitation; temperature; sensitivity |
