陕西省降雨和风蚀气候侵蚀力时空分布特征.

[Objective] The spatio-temporal distribution. abrupt change and periodic characteristics of rainfall erosivity and wind erosion climate erosivity in different regions of Shaanxi Province were studied > so as to provide scientific basis for soil erosion control and ecological construction in Shaanxi. Methods] The daily meteorological data of 96 stations in Shaanxi Province from 1981 to 2020 were used to calculate the rainfall erosivity and wind erosion climatic erosivity to analyze the change of water-wind erosion climate erosivity using methods such as climate trend analysis, spatial interpolation, Mann-kendall trend test and wavelet analysis. [Results] (1) The rainfall erosivity in Shaanxi from 1 981 to 2020 was 2 71 9.6 MJ * mm/(hm' • h). with large spatial differences, showing a spatial distribution of high in the south and low in the north. The wind erosion climatic erosivity froni 1981 to 2020 was 3.18, with a decreasing trend froni north to south. (2) Tn the past 4() years, the rainfall erosivity in Shaanxi showed an evident inter-annual variation with general upward but not passing a significant test. The rainfall erosion experienced a variation trend of first increasing and then decreasing, and it was stronger in the current era. The wind erosion climatic erosivity also showed an evident inter-annual variation, but the change trend was not significant. It experienced a variation trend of first decreasing and then increasing. Tt was strongest in the 1 990s and weakest in the current era. The rainfall erosivity was mainly larger from June to September, and the maximum value appeared in July. The wind erosion climatic erosivity was larger in winter and spring, and the maximum value was in April. The two erosivities were obviously asynchronous. (4) There were three oscillation periods of rainfall erosivity in Shaanxi Province, which was 2〜4 years, 8 years and 31 〜32 years. There were two oscillation periods of wind erosion climatic erosivity, which were 5〜1() years and 31 〜32 years. The abrupt change of rainfall erosivity occurred significantly in 2009, since then the rainfall erosivity increased gradually. Conclusion] At present, the rainfall erosivity in most areas of Shaanxi Province is strong, especially in northern Shaanxi with the strongest wind erosion climate erosivity. The wind erosion climate erosivity in eastern Yulin also showed an upward trend in recent 4() years. Therefore, more attention should be paid to the increase of wind erosion and water erosion climate erosivity in these areas. [ABSTRACT FROM AUTHOR]