WANG Huan,MEI Zaimei.Spatiotemporal Changes of Evapotranspiration and Their Relationship with Climate Factors in Guizhou Province[J].Research of Soil and Water Conservation,2020,27(05):221-229.
贵州省地表蒸散发时空变化及其与气候因子的关系
- Title:
- Spatiotemporal Changes of Evapotranspiration and Their Relationship with Climate Factors in Guizhou Province
- 文章编号:
- 1005-3409(2020)05-0221-09
- Keywords:
- evapotranspiration; spatiotemporal characteristics; climatic factors; MOD16; Guizhou Province
- 分类号:
- P426.2
- 文献标志码:
- A
- 摘要:
- 探究贵州省地表蒸散发(ET)时空特征及气候变化对其的影响,对理解气候变化和水资源的关系具有重要的意义。基于2000—2014年的MOD16A2/ET产品和气象站数据,综合运用单相关、偏相关和复相关分析法,分析了研究区ET的时空变化特征及其与气候因子的关系。研究表明:(1)蒸发皿观测值折算所得的实测ET与MOD16/A2ET呈强相关(R=0.80),能满足ET相关研究的需要;(2)ET具有明显的空间异质性,由西北向东南,ET逐渐变大,ET与海拔区间呈负相关;(3)研究时段内,ET的年际波动增加速度较缓,ET的年内变化呈单峰型,7月为高峰;(4)ET与同期气温和降水量在整个研究区呈正相关关系,与同期日照时数呈正相关的区域大于呈负相关的区域。降水量是对贵州省ET年内变化影响最大的气候因子,驱动力分析表明贵州省ET的主要驱动类型为降水量强驱动型和降水量驱动型。
- Abstract:
- To explore the spatiotemporal characteristics of surface evapotranspiration(ET)and the influence of climate change on these characteristics is of great significance to understand the relationship between climate change and water resources. Based on the data of MOD16A2/ET products and meteorological stations from 2000 to 2014, single correlation, partial correlation and complex correlation analysis were comprehensively used to analyze the spatiotemporal variation characteristics of ET in the study area and their relationship with climate factors. The results show that:(1)the measured ET converted from the observed value of evaporating dish is strongly correlated with MOD16/A2ET(R=0.80), which can meet the needs of ET related research;(2)ET has obvious spatial heterogeneity; from northwest to southeast, ET gradually increases, and ET is negatively correlated with elevation interval;(3)during the study period, the fluctuation of inter-annual variation of ET increases slowly, and the ET shows a periodic unimodal trend and peaks in July;(4)there is a positive correlation between ET and the temperature and precipitation in the whole study area, and the area with a positive correlation with the duration of sunshine in the same period is larger than the area with a negative correlation; precipitation is the climate factor that has the greatest influence on ET variation in Guizhou Province. The driving force analysis shows that the main driving types of ET in Guizhou Province are precipitation-strong-drive and precipitation-drive.
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备注/Memo
收稿日期:2020-04-17修回日期:2020-04-28
资助项目:贵州省科技计划项目“贵州省山地特色休闲养生旅游资源开发与服务企业行动计划”(黔科合平台人才[2017]5720)
第一作者:王焕(1993—),女,贵州省毕节人,硕士,主要从事自然资源开发与规划相关研究。E-mail:2325605282@qq.com
通信作者:梅再美(1961—),男(土家族),贵州省贵阳人,教授,主要从事自然资源开发与规划及环境保护与治理相关研究。E-mail:meiminggui@qq.com