Global wind erosion assessment is of great significance for identifying hot spots of wind erosion and defining key areas of soil conservation services. However, it is difficult for the existing wind erosion assessment models to be popularized and applied on a global scale. Therefore, it is encential to carry out parameter calibration and scale generalization of wind erosion models for accurate assessment of global soil wind erosion.
Based on RWEQ model, this study conducted parameter calibration and optimization calculation of wind erosion impact factors, combined with remote sensing, geographic information system and mathematical statistical methods, and constructed a soil wind erosion assessment model applicable to the global scale. The model was used to estimate global soil wind erosion from 2001 to 2010, and the spatial and temporal distribution and variation characteristics of soil wind erosion intensity were analyzed, and the key areas of soil conservation service were identified. The main research results are as follows:
（1) The global wind erosion area above micro degree is 88.6685 million km2, accounting for 59.55% of the global land area. Microdegree, mild, moderate, intensity, extreme intensity and severe wind erosion area respectively account for 56.05 %, 20.81 %, 5.58 %, 3.43 %, 3.64 % and 10.84 % of the total area of wind erosion area. Severe wind erosion accounts for 86.19 % of the total soil erosion.
（2) The wind erosion area of every continent accounts for the percentage of the total wind erosion area in the global, Africa, Asia, South America, Oceania, North America and Europe account for 32.93 %, 28.76 %, 18.89 %, 9.54 %, 8.76 % and 1.11% ,respectively. The multi-year mean wind erosion intensities of Africa, Asia, South America, Oceania, North America and Europe were 15864.66, 5369.77, 2645.22, 1728.79, 904.45 and 46.39 t∙km-2∙yr-1, respectively. Soil wind erosion in Africa, Asia, South America, Oceania, North America and Europe accounted for 70.34%, 20.79%, 4.4%, 3.4%, 1.07% and 0.007% of global wind erosion, respectively.
（3) The global average soil wind erosion intensity reached a maximum of 7832 t∙km-2∙yr-1 in 2009 and a minimum of 5107 t∙km-2∙yr-1 in 2005. From 2001 to 2002 and from 2005 to 2009, the global average wind erosion intensity showed an increasing trend, among which the wind erosion intensity increased significantly from 2007 to 2009. From 2002 to 2005 and from 2009 to 2010, the global average wind erosion intensity showed a decreasing trend, in which the wind erosion intensity from 2009 to 2010 showed a significant decreasing trend.
（4)From 2001 to 2010, the global soil wind erosion showed a weakening trend on the whole, and the average change slope was -2.42 t∙km-2∙yr-1. The wind erosion intensity of soil in 40.62% regions of the world showed a trend of intensification, among which, 4.4% of regions exceeded the significance level of 5%, with an average slope of 1204.42 t∙km-2∙yr-1.The wind erosion intensity of soil in 59.38% of the regions in the world showed a weakening trend, among which 10.71% of the regions exceeded the significance level of 5%, with an average slope of -515.81 t∙km-2∙yr-1。
（5) The most sensitive areas of soil wind erosion are Africa and Asia, and Europe has the least risk of wind erosion. Global soil conservation service focus areas are concentrated in Peru, Argentina, the Sahara Desert, Namibia, the Arabian Peninsula, Iran, Kazakhstan, south central Australia and northwest China.