Influence of climatic change on winter wheat cropping system in Shanxi
Based on the ground meteorological observation data and information of winter wheat growth and development in 1961 - 2005, the change tendencies and characteristics of climatic element and essential boundary temperature in Shanxi Province were analyzed.The results showed that annual mean temperature warming was obvious, the mean temperature in the coldest month increased steadly, its tendency rate was for 0.42°C/10a; Winter and spring warming were obvious, and the winter temperature rise was especially remarkable. The equivalent line of the annual mean temperature and the lowest temperature moving to the north were extremely obvious; precipitation tendency was reduce, the fall and the summer precipitation declining trend as well as gradualness were obvious, the winter and the spring precipitation changes were not obvious, but the gradual fluctuation was quite big;the annual mean sunshine hours also assumed the declining trend. ≥0℃ accumulated temperature and precipitation and sunshine hours were normal in the regional distribution in southeast area than 1960s, Other areas assumed increase and reduced tendency. By the M - K test, from the late 1970s and the early 1990s temperature increase and the precipitation decrease tendency were obvious. The climate change caused the postpone of the winter wheat sowing time, development period was ahead, north -border of winter wheat planting moved to north about 15km than in the 1960s.
NETL
NSTL
万方数据
维普
