**Notes**

This article is selected from *Physical Geography* and *Journal of Arid Land*, available online: http://www.tandfonline.com/ [Article DOI: http://dx.doi.org/10.1080/ 02723646.2015.1133189] and https://link.springe126r.com [Article DOI: https://doi. org/10.1007/s40333-016-0088-6].
