关键词: 植物生长调节剂, 植物生长调节剂, 中药材栽培, 科学使用, 用药安全

Abstract: The paper aims to study the climatic characteristics of frozen soil in high latitudes. We analyzed the temporal and spatial distribution characteristics of frozen soil elements in seasonal frozen soil areas in Heilongjiang from 1961 to 2016 by using statistical analysis and IDW methods. The results showed that: (1) the annual average maximum frozen soil depth in Heilongjiang was about 171.6 cm, showing a significant decreasing trend; the maximum depth of frozen soil in all regions of Heilongjiang (except Tonghe) showed a significant decreasing trend; (2) the average initial date of frozen soil was October 23, showing a significant postponing trend; the initial date of the frozen soil in most parts of Heilongjiang were delayed, and the delay rate in the west was higher than that in the east; (3) the average final date of frozen soil was May 29, showing a significant trend of advance; in most parts of Heilongjiang, the final date of frozen soil was advanced significantly, especially in Keshan, Helen, Anda and Yichun with the advance rate 6.3-9.8 d/10 a; (4) the average frozen soil period was about 218 days, showing a significant decreasing trend; the zonal distribution of frozen soil in different regions was obvious, and the decreasing trend was of different degrees, and the decreasing rate in the west was greater than that in the east. The results can be used as a basis for further research on climate change, engineering meteorology, short-term climate prediction and ecological climate.