**3. Results and analysis**

#### **3.1 Interannual variation of microclimate inside and outside shelterbelt**

Generally, air temperature, ground temperature, evaporation, and wind speed inside shelterbelt were lower than those outside shelterbelt, while the relative humidity and precipitation were higher than those outside shelterbelt (**Table 1**). The interannual temperature outside shelterbelt varies more than inside shelterbelt, the interannual temperature outside shelterbelt fluctuates between 1.14 ~ 3.21°C, and the interannual temperature inside shelterbelt fluctuates between 0.40 ~ 0.67°C. The evaporation showed a downward trend inside shelterbelt, and it showed an increasing trend outside shelterbelt, but the changes were relatively gentle. The land ground temperature showed an overall upward trend inside and outside the shelterbelt. The precipitation showed a decreasing trend inside and outside shelterbelt, and the changes were relatively gentle. The evaporation showed a downward trend inside and outside shelterbelt. The changes of wind speed were relatively gentle inside and outside shelterbelt. Under the influence of a large-scale oasis shelterbelts, air temperature, land ground temperature and evaporation decreased 5.13% ~ 24.74%, 2.38% ~ 20.09% and 7.06% ~ 17.68%, respectively, whereas relative humidity and precipitation increased 6.93% ~ 25.53% and 4.30% ~ 50.15%, respectively.
