关键词: 农业机械, 农业机械, 移栽机, 钵苗, 取送苗系统

Abstract: The climate characteristics of winter temperature in Qingyang, Loess Plateau of east Gansu, were analyzed according to the temperature record sequence of Xifeng National Basic Meteorological Observing Station from 1950 to 2017 by WMO extreme climate index linear propensity estimation, M-K test, EEMD, etc., following the national standard of warm winter grade. The results showed that the extreme climate index had abrupt change in the past 60 years, especially from the late 1980s to the early 21st century, besides, the abrupt change did not have synchronous phrase, the interdecadal variation including mean temperature, mean maximum and minimum temperature in winter rose in echelon, moreover, there was a continuing warming trend in winter and the events leading to climate warming were increasing, in particular, the rise of the minimum temperature at night contributed greatly to winter climate warming. In 2017, the extreme minimum temperature, mean air temperature, mean maximum and minimum temperature all broke the history record, in other words, the winter in 2017 was the warmest winter since 1951.