Publications

Zhao, BE; Chong, SL (2024). SPATIOTEMPORAL DISTRIBUTION PATTERN OF SURFACE EVAPOTRANSPIRATION IN GANNAN PREFECTURE, CHINA BASED ON MOD16. APPLIED ECOLOGY AND ENVIRONMENTAL RESEARCH.

Abstract
Gannan Prefecture, China faces problems of water resource shortage and fragile ecological environment. Exploring the spatiotemporal pattern of ET can provide a basis for regional water resource development. The study analyzes the interannual changes and spatiotemporal characteristics of evapotranspiration based on MOD16, and selects meteorological, LULC data to analyze their impact on ET through trend analysis method and correlation. From 2000 to 2020, the overall AET in Gannan Prefecture showed an upward trend (P < 0.01), with an average upward rate of 6.30 mm/a. The PET showed a downward trend (P < 0.01), with an average downward rate of 6.24 mm/a. The average change rate of AET in Gannan Prefecture is 6.54 mm/a, mainly concentrated in 5-10 mm/a, and the average change rate of PET is -7.24 mm/a. The AET in Gannan Prefecture is consistent with the interannual change trend of hydrothermal conditions, showing a slow upward trend. The correlation coefficient between AET and rainfall is 0.56, and the correlation coefficient with temperature is 0.69, indicating that the AET in Gannan Prefecture is jointly affected by hydrothermal conditions. The difference in AET between grassland, cultivated land, and wetland in Gannan Prefecture is not significant, and the difference in PET is not significant. Land use type is not the dominant factor for ET changes in Gannan.

DOI:
10.15666/aeer/2203_21072120

ISSN:
1785-0037