| 摘要: |
| 【目的】探究伊犁河流域2000—2014年蒸散量时空特征，为跨境水资源确权与分配提供依据。【方法】本文利用变异系数、Theil-Sen median 趋势分析、Mann-Kendall和Hurst指数方法研究了伊犁河流域2000—2014蒸散量时空变化特征及波动性。【结果】①伊犁河流域多年平均蒸散量值为249.80 mm，其波动范围在224.03~274.10 mm之间。②多年平均ET值在空间上具有明显差异，取值范围在115.6~758.79 mm之间，总体上呈自上游向下游减少的空间格局。③该流域年内蒸散量具有明显的季节差异，总体呈先增后减的单峰波趋势。④该流域内各土地利用多年平均蒸散量表现为：耕地（327.23 mm）＞林地（319.10 mm）＞草地（239.50 mm）＞稀疏植被（151.67 mm）。⑤2000—2014年该流域的多年平均ET整体上变异程度不明显，变异程度中比较稳定和稳定所占面积比为85.47%；变异系数在空间上取值范围为0.01~0.71，其平均值为0.097。⑥整个流域内ET减少的趋势和增加的趋势所占面积比例分别为64.48%和26.72%，变化趋势以减小为主，变化率为-1.152 mm/a，该流域未来ET的变化状况与过去一致，以持续性减少为主。【结论】利用变异系数、Theil-Sen median趋势分析、Mann-Kendall和Hurst指数方法能够有效发现伊犁河流域时空变化特征，研究结果可为伊犁河流域规划及合理分配流域水资源提供依据。 |
| 关键词: 蒸散；MOD16；流域；时空特征；趋势分析 |
| DOI：10.13522/j.cnki.ggps.2019415 |
| 分类号: |
| 基金项目: |
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| Temporal and Spatial Characteristics of Surface Evapotranspiration in the Ili River Basin |
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LIANG Hongshan, WANG Dan, ZHENG Jianghua
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1. College of Resources and Environmental Sciences, Xinjiang University, Urumqi 830046, China；2.Institute of Arid Ecology and Environment, Xinjiang University, Urumqi 830046, China；
3. Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi 830046, China
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| Abstract: |
| 【Objective】 This paper is to explore the temporal and spatial characteristics of the evapotranspiration in the Ili River Basin from 2000 to 2014, and to provide a basis for the determination and distribution of cross-border water resources.【Method】In this paper, the temporal and spatial variation characteristics and volatility of evapotranspiration in the Ili River Basin were studied by using the methods of variation coefficient, Theil-Sen median, Mann-Kendall and Hurst index. 【Result】The result showed that: ①The annual average evapotranspiration of the Ili River Basin was 249.80 mm, and its fluctuation range was 224.03~274.10 mm. ②The average ET value of multi years had obvious difference in space, ranging from 115.6 mm to 758.79 mm, which showed the spatial pattern of decreasing from upstream to downstream. ③The annual evapotranspiration of the basin had obvious seasonal difference, and the overall trend of unimodal wave increased first and then decreased. ④The annual average evapotranspiration of land use in the basin was as follows: cultivated land (327.23 mm) > forest land (319.10 mm) > grassland (239.50 mm) > sparsely vegetation (151.67 mm). ⑤During the study period, the variation degree of annual average ET in the basin was not obvious as a whole, and the proportion of stable and stable areas in the variation degree was 85.47%. The spatial value range of variation coefficient was 0.01~0.71, and the average value was 0.097. ⑥The decreasing trend and increasing trend of ET in the whole basin account for 64.48% and 26.72% of the total area, respectively. The main trend of ET change was decreasing, with a change rate of -1.152 mm/a. The future change of ET in the basin is consistent with the past, with a continuous decrease as the main trend.【Conclusion】Using the methods of variation coefficient, Theil-Sen median, Mann-Kendall and Hurst index, the temporal and spatial variation characteristics of the Ili River basin can be found effectively. The research results can provide a basis for planning and rational distribution of water resources in the Ili River Basin. |
| Key words: evapotranspiration; MOD16; Ili River Basin; temporal and spatial characteristics; trend analys |
