Abstract:
Based on the meteorological data of south and north region in Qinling Mountains from 1970 to 2009, by applying the spatial analysis method, the characteristics of the migration and area change of the annual mean temperature belt and annual precipitation belt in the south and north region of Qinling Mountains were analyzed. The results indicated: (1) in the recent 40 years, the annual mean temperature belt of the north and south area in Qinling Mountains migrated obviously. Compared with the reference period (from 1971 to 2000), at the beginning of 10a in the 21st century the position was at the most north part, moved to north by 0.5°, in the other ages only the 1980s slightly moved to south by 0.15°; in the 1980s the area of 12~13℃temperature belt was largest, while in the 1990s the area of 13~14℃ temperature belt was largest. (2) in the recent 40 years, the annual precipitation belt of the north and south area in Qinling Mountains also migrated obviously. Compared with the reference period, in the 1980s it moved to north by 0.4°, while in the other ages slightly moved to south by 0.15°; in the 1970s the area of 600～800 mm annual precipitation belt was largest, while in the 1980s the area of 800～1 000 mm precipitation belt was largest. (3) in the recent 40 years, the warming-drying tendency in the south and north region of Qinling Mountains was obvious, experienced a changing process of warming-drying, colding-wetting to warming-drying. And this migration will influence the cropping systems of the study area.
