关键词: 策勒, 绿洲-沙漠过渡带, 绿洲, 小气候, 空间差异

Abstract:

Analysis was done to the differences in time and space of monthly wind velocity, temperature, relative humidity and photosynthetically active radiation in four different underlying surfaces between ecotone and oasis in 2011. Additionally, a fine day in summer were chosen to synchronously analyze meteorological factors by comparing with sand-storm day, floating dust day, blown sand day and wet day. The results showed that: the monthly wind velocity in semi-fixed sandy land, fixed sandy land and oasis at the height of 2 m was 25.22%, 27.93% and 65.27% less, respectively, than that in mobile sandy land in June; the monthly temperature at the height of 0.5 m in oasis was higher than the rest three sites by 1.39 ℃, 1.21 ℃ and 2.70 ℃, respectively; the difference of temperature and relative humidity between May and October between the four underlying surfaces was greater than that of winter and spring; in July, the monthly temperature at the height of 2 m in mobile sandy land was higher than semi-fixed sandy land, fixed sandy land, oasis by 0.35 ℃, 1.61 ℃, 3.75 ℃, respectively; the wind velocity in sand-dust storm day was less than blown sand day, floating dust weather and wet day in turn; the air temperature in blown dust weather and fine day decreased gradually from mobile sandy land to oasis; while the relative humidity increased gradually and the difference between the four sites; the difference of air temperature and relative humidity at the four sites in sand storm weather and wet and cheerless weather was not obvious; difference of air temperature and relative humidity between blown sand day was more than that in wet day and less than that in blown dust day and fine day; difference of photosynthetically active radiation between the four sites was most obvious in day with sand-dust storm, there was no obvious difference between the day with blown dust and wet day.

Key words: Cele, oasis-desert ecotone, oasis, microclimate, spatial difference