Analysis of Reference Evapotranspiration Change and Its Impact Factors in Australia
[Objective] To discuss regional response of reference evapotranspiration (ET_0) to global climate change and its influencing factors. [Method] Penman-Monteith equation was adopted to calculate ET_0 in Australia from 1998 to 2007. Spatiotemporal variation characteristics were analyzed by using GIS spatial analysis tools and relationships between ET_0 and main climate factors were also analyzed. [Results] The results showed that multi-year mean ET_0 increased from the east and south part to the northwest part and inland, and its distribution was consistent with climate zones, multi-year regional mean ET_0 was 1 750 mm, obtaining minimum and maximum values in 2000 and 2002 respectively; regional ET_0 decreased in the order of summer, spring, autumn and winter, January and December got the highest monthly ET_0, while June got the lowest value 79.55 mm; ET_0 positively correlated with average air temperature and sun radiation, R~2 for each were 0.83 and 0.94, while the relationship between ET_0 and average relative humidity was negative, and precipitation had no significant relationship with ET_0. [Conclusion] This research could provide important reference for crop water requirement study and making irrigation method for Australia.
国家科技期刊平台
NSTL
万方数据
维普
