关键词: 土壤风蚀, 起动风速, 降水, 分区评述, 东北三省

Abstract: Based on the meteorological data from 1981 to 2017 in the three provinces of Northeast China, the temporal and spatial patterns of daily maximum wind speed at different levels during three study periods (the whole year, the fallow period of the year and one month before sowing date) were analyzed. Then using the starting wind speed index considering the influence of precipitation, the temporal and spatial patterns of the days of soil wind erosion during three study periods in different regions were analyzed. And suggestions on soil conservation tillage measures in different regions were put forward. It will provide scientific basis for the promotion of soil conservation tillage measures in various regions. The results showed that the regional annual average frequencies of wind scaled from calm to gentle breeze, from moderate breeze to strong breeze and moderate gale and above were 48.5%, 50.4% and 1.1%, respectively. During the past 37 years, the frequencies of wind scale from calm to gentle breeze during these three study periods showed increasing trends, while the frequencies of wind scale in moderate breeze and above showed the decreasing trends. The regional annual proportion of the days of wind erosion was 35.0%, but this value is higher during one month before sowing period (57.0%). In most areas, the days of wind erosion in each period showed decreasing trends. In Liaohe plain and Sanjiang plain, the frequencies of wind erosion during fallow period and one month before sowing were serious. Therefore, more attention should be paid to the impacts of wind erosion on soil. In Songnen plain, the frequency of soil wind erosion is lower during the fallow period, but serious during one month before sowing. Therefore, no-tillage technology is advocated in this area to reduce soil wind erosion.

Key words: Soil wind erosion, Starting wind speed, Precipitation, Zoning review, The three provinces of Northeast China