Abstract:

 Based on the suitable meteorological conditions for tea growth in spring, daily meteorological data from 72 meteorological stations in Jiangsu during 1981 to 2020 were used to construct the daily scale tea climate suitability index by applying the me thod of fuzzy mathematics, and regional division and evaluation of the climatic suitability of spring tea in Jiangsu province were realized. Furthermore, the temporal and spatial characteristics of the climatic suitability of spring tea in Jiangsu in different decade under the background of climate change were analyzed. The results showed that the spatiotemporal variation characteristics of climate suitability for spring tea in Jiangsu province had similarities and differences. The daily scale climate suitability of spring tea in three dominant tea growing regions showed a single peak distribution, and the peak period located from early-April to late-May. With the change of decades, the times when the climatic suitability of tea growth entered the peak period showed an early trend of about 10 days. While, the annual scale climate suitability index of the three dominant tea growing regions reached its peak during the period from 2000 to 2010, and basically showed an increased trend. During different interdecadal, the low mountain tea area around Taihu lake always belonged to the high suitability area, Lianyungang tea area always belonged to the low suitability area, and Ningzhenyang hilly tea area mainly belonged to the medium suitability area. For Jiangsu region, the climate suitability index of spring tea showed the distribution characteristics of "low in the north and high in the south". The interdecadal variation characteristics were obvious, showing an upward trend of 0.005·10y⁻¹. While, climate resources of spring tea growth during the period from 2000 to 2010 were the best during the study period. 

Key words: Climate change, Spring tea, Fuzzy mathematics, Climate suitability, Jiangsu