Abstract: In order to find out the microclimate law on the edge of the desert and to clarify its microclimate effect and its influence on the grape quality,this paper reported the microclimate observation and the sampling test results of wine grape from Jianjian Lake Development Zone vineyard in Shapotou desert edge and Changle base vineyard in normal background from the beginning of April to the end of September in 2019.A principal component analysis was used to comprehensively evaluate the main quality factors of wine grape,total sugar,sugar and acid ratio,pH and tannin.The main meteorological factors and influence periods affecting the comprehensive quality of wine grape were analyzed by factor analysis.The results showed that the wine grape in the Jianjian Lake Development Zone had high sugar content,rich tannin content and a high comprehensive score.The maximum temperature during the growth period was 22.0-31.2 ℃;the lowest temperature was 9.3-16.4 ℃;the effective accumulated temperature was 1 762.5 ℃;the temperature of 20-40 cm was 20.0-25.0 ℃;the sunshine hours were 1 495.8 h;the precipitation was 26.3 mm;and the air humidity was 44.4%.Therefore,the microclimate at the edge of the desert has the characteristics of a large temperature difference between day and night,sufficient heat,less precipitation,and low humidity,which was beneficial to the accumulation of glucose and the increase of phenolic content,and was suitable for the cultivation of high-quality wine grape.

Key words: Desert edge, Microclimate, Wine grape, Quality, Meteorological factor, Shapotou desert