What is the impact of 20 15 El Nino weather on northwest China? Agriculture.

According to the data analysis, the annual occurrence and epidemic cycle of wheat yellow dwarf disease in Shaanxi is 2 ~ 7 years, which is consistent with the recurrence cycle of El Ni? o phenomenon, that is, the year after El Ni? o year is the epidemic year of wheat yellow dwarf disease. Taking Pucheng County as an example, in the year when El Ni? o occurred, compared with the average over the years, the monthly precipitation decreased and the monthly average temperature increased. After the occurrence of El Ni? o, the above-mentioned climatic phenomena generally last for a long time, which not only affects the current year, but also lasts until the following year, often causing drought in autumn, winter and spring, providing favorable climatic conditions for the occurrence of wheat yellow dwarf disease.

Reference: Evolution of Wheat Yellow Dwarf Disease and El Nino Phenomenon in Shaanxi, Journal of Northwest Agriculture.

ki . com . cn/Article/CJFDTotal-xbnx 19990 10 18 . htm

In addition, according to the Beijing Times, Xinhuanet reported in July 2065438+2004:

1997 In the summer, large-scale continuous high temperature weather occurred in most parts of North China, Northwest China and Northeast China, which was rare for decades. It can be considered that the influence of this natural climate on agriculture is regular, and its influence and function in different crops vary with varieties and individuals.