MENG Yu,DAN Wenhong,WANG Huan.Spatiotemporal Characteristics of Evapotranspiration and Its Affecting Factors in Wujiang Basin Based on MOD16[J].Research of Soil and Water Conservation,2020,27(06):139-145.
基于MOD16的乌江流域地表蒸散发时空特征及影响因素
- Title:
- Spatiotemporal Characteristics of Evapotranspiration and Its Affecting Factors in Wujiang Basin Based on MOD16
- 文章编号:
- 1005-3409(2020)06-0139-07
- Keywords:
- evapotranspiration; spatiotemporal characteristics; affecting factors; MODIS; Wujiang Basin
- 分类号:
- P426.2
- 文献标志码:
- A
- 摘要:
- 为探讨贵州省乌江流域地表蒸散发(ET)时空特征及其影响因素,运用MOD16A2/ET产品和气象站数据,通过趋势分析与相关分析法,探讨了乌江流域ET时空变化特征及其影响因素。结果表明:(1)2000—2014年乌江流域年际ET波动较大,年内ET呈周期性单峰变化趋势,ET季节变化表现为夏季(311.31 mm)>春季(245.57 mm)>秋季(138.10 mm)>冬季(132.51 mm);(2)乌江流域ET空间异质性显著,呈西低东高的空间格局,平均ET值为605.43～1 208.26 mm;(3)各气候因子对ET的影响范围由大到小依次为降水量(30.67%)>气温(29.56%)>日照时数(23.84%),三者对ET均以正相关为主。乌江流域ET的时空分布特征虽受气候因子所控制,但各因子对ET的影响程度、范围却存在显著差异。
- Abstract:
- To explore the spatialtemporal characteristics of surface evapotranspiration(ET)and its affecting factors in Wujiang Basin, Guizhou Province, MOD16A2/ET products and weather station data, trend analysis and correlation analysis were used to explore the spatiotemporal variation characteristics of ET and its affecting factors. The results show that:(1)from 2000 to 2014, the interannual ET in Wujiang Basin fluctuated greatly, and the annual ET showed a cyclical unitary change trend; the seasonal change of ET decreased in the order: summer(311.31 mm)>spring(245.57 mm)>autumn(138.10 mm)>winter(132.51 mm);(2)ET spatial heterogeneity of Wujiang Basin was significant, showing a spatial pattern of low level in the west and high level in the east; the average ET value was between 605.43 mm and 1 208.26 mm;(3)the influence range of each climate factor on ET decreased in order: precipitation(30.67%)>air temperature(29.56%)>sunshine hours(23.84%), the three pairs of ET were mainly positively correlated. Although the spatiotemporal distribution characteristics of ET in Wujiang Basin were controlled by climate factors, the influence degree and range of each factor on ET were significantly different.
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备注/Memo
收稿日期:2019-12-14 修回日期:2020-02-13
资助项目:蒙雨(1998—),女,贵州毕节人,硕士,研究方向为乡村地理与农村发展。E-mail:my18785040702@163.com
第一作者:但文红(1967—),女,贵州贵阳人,教授,主要从事乡村地理与农村发展研究。E-mail:622007761@qq.com