WANG Yongfeng,JING Juanli,MA Bingxin.Spatiotemporal Characteristics of Evapotranspiration and Its Driving Climate Factors in the Karst Areas of Yunnan-Guizhou-Guangxi[J].Research of Soil and Water Conservation,2022,29(05):235-243.
滇黔桂岩溶区ET时空特征及气候因子驱动
- Title:
- Spatiotemporal Characteristics of Evapotranspiration and Its Driving Climate Factors in the Karst Areas of Yunnan-Guizhou-Guangxi
- 文章编号:
- 1005-3409(2022)05-0235-09
- Keywords:
- karst areas of Yunnan-Guizhou-Guangxi; evapotranspiration; trend analysis; Hurst index; correlation analysis
- 分类号:
- P426.2
- 文献标志码:
- A
- 摘要:
- 基于滇黔桂岩溶区2000—2014年MOD16 ET产品和同期72个气象站点数据,运用趋势分析法、Hurst指数、偏相关分析法和复相关分析法,探究地表蒸散发时空变化特征及其气候因子驱动。结果表明:(1)年际ET呈不显著增加趋势(p>0.05),距平相对变化率年际差异较大; 年内ET呈单峰变化趋势,7月份达到最大值; 不同生态地理区ET具有差异性。(2)ET多年均值总体呈西北部低、东南部高的空间分布格局; 季节ET均值差异显著,夏季ET最强,冬季最弱。(3)年际ET变化趋势以不显著变化为主,呈增加趋势的区域面积略大于呈减少趋势的区域面积; Hurst指数大于0.5的持续性区域占比91.41%,ET变化趋势以持续性为主导; 不同植被类型ET均值及变化趋势具有差异性。(4)不同生态地理区ET与降水和温度的偏相关系数波动较大,温度对ET的影响大于降水; ET与降水和气温的复相关系数总体呈不显著正相关,复相关系数值在空间上呈西北高、东南低的分布格局; ET受气候因子驱动的地区主要表现为气温驱动。综上,揭示了滇黔桂岩溶区ET时空变化特征,明确了ET变化的主要气候驱动类型。
- Abstract:
- The spatiotemporal variation characteristics of evapotranspiration and its driving climate factors in the karst areas of Yunnan-Guizhou-Guangxi were investigated based on the MOD16 ET products and 72 meteorological stations from 2000 to 2014 by using trend analysis, Hurst index, partial correlation analysis and complex correlation analysis methods. The results showed that:(1)the annual ET showed an insignificant increasing trend(p>0.05), and the relative change rate of anomaly was significantly different between years; the monthly ET showed a unimodal trend and reached to the maximum value in July; values of ET were different among eco-geographical regions;(2)the spatial distribution of annual mean ET was low in the northwest and high in the southeast; the seasonal mean ET was significantly different, with the strongest level in summer and the weakest level in winter;(3)the variation trend of interannual ET was mainly insignificant, and the area with increasing trend was slightly greater than that with decreasing trend; the region where Hurst index was greater than 0.5 accounted for 91.41%, and therefore the variation trend of ET was dominated by persistence; the mean values and variation trends of ET in different types of vegetation were different;(4)the partial correlation coefficients between ET and precipitation and temperature fluctuated greatly among eco-geographical regions, and the influence of temperature on ET was greater than that of precipitation; the complex correlation coefficient between ET and precipitation and temperature was insignificantly positive, and the spatial distribution of coefficient was high in northwest and low in southeast; the climate-driven region of ET was predominantly temperature-driven in the study area. In summary, the spatial and temporal variation characteristics of ET in karst region of Yunnan-Guizhou-Guangxi were revealed, and the main climate driving types of ET changes were clarified.
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备注/Memo
收稿日期:2021-08-20 修回日期:2021-09-02
资助项目:国家自然科学基金项目(42161028); 广西自然科学资助项目(2020GXNSFBA297160); 广西空间信息与测绘重点实验室资助项目(16-380-25-08)
第一作者:王永锋(1977—),男,陕西合阳人,实验师,硕士,主要从事环境遥感方面的研究。E-mail:6605004@glut.edu.cn
通信作者:靖娟利(1977—),女,陕西长安人,副教授,硕士,主要从事资源环境遥感方面的研究。E-mail:2003080@glut.edu.cn