Abstract:

Climate has an important impact on the growth of flue-cured tobacco and tobacco leaf quality. In order to clarify the change characteristics of climate elements in the field period of flue-cured tobacco in Nanping tobacco-growing area, this study used the climate data of growing period of tobacco (mid-January to mid-July) from 1971 to 2019 provided by Nanping Meteorological Bureau, and the Mann-Kendall method was used to detect abrupt change of climate, the temporal and spatial variation characteristics of typical climatic elements such as temperature, precipitation and sunshine duration were analyzed. The results showed that the interannual sunshine hours tended to decrease and the temperature and precipitation tended to increase during field growing period of flue-cured tobacco, and the inflection point was in 1995. The abrupt change of climate mainly occurred in the air temperature and sunshine hours of spring tobacco, and occurred in the mid-1970s and early 2000s respectively, the precipitation factors did not change abruptly. The temperature in the field growing period of early spring tobacco and spring tobacco was lower in the north area, and higher in the south and middle area. Precipitation was higher in the north area, but lower in the south and middle area. The sunshine hours increased gradually from west to east or southeast. With the growth period of flue-cured tobacco progress, the temperature increased gradually, the sunshine hours increased rapidly from late June, and the heavy precipitation was mainly concentrated in June. The difference of sunshine hours between early spring tobacco and spring tobacco field growth period was mainly in the root expanding stage and mature stage. The research results are of great significance to the rational use of climate resources, avoiding disadvantages and improving the yield and quality of tobacco leaves.

Key words: Nanping, flue-cured tobacco, climate factors, temporal and spatial variation characteristics