Impact assessment of climate change and human activities on wind erosion
on the Qinghai-Tibet Plateau, China
Abstract
Wind erosion has become one of the major causes of land degradation on
the Qinghai-Tibet Plateau (QTP). Assessing wind erosion dynamics is
critical to forecast wind erosion and formulate desertification control
strategies. In this study, the spatial and temporal variations in wind
erosion on the QTP from 1980 to 2015 were evaluated by the revised wind
erosion equation (RWEQ). Furthermore, the relative contributions of
climate change and human activities to wind erosion were analysed to
identify the drivers. The results showed that wind erosion intensity on
the QTP increased continuously from southeast to northwest. Areas with
moderate or high soil erosion intensity (>25 t∙hm2∙a-1),
accounting for 53.48% of the region, were mainly distributed on the
western and northern parts of the plateau. The mean annual soil wind
erosion modulus (SWEM) of the total region during 1980-2015 was 32.08
t∙hm2∙a-1, with an obvious decline at a rate of approximately 0.14
t∙hm2∙a-1 in this period. However, 9.99% of the study area showed a
relatively significant increase, and these areas were mostly located in
the northwestern part of the region. Climate change, especially
variation in wind speed, was the dominant factor that affected wind
erosion over the whole plateau, whereas the impacts of human activities
such as grazing and ecological restoration policies and programmes were
comparatively small and usually more localized.