流动沙丘土壤表层蒸发量主要取决于干沙层的厚度，表现为随着干沙层厚度的增加，沙丘表层的蒸发量逐渐降低。
The evaporating capacity of surface soil in mobile dune is mostly rest with thickness of dry sand bed, with the increasing of dry sand bed thickness, the evaporating capacity reduce gradually.
中国地区气溶胶光学厚度呈现逐年增加的趋势，但1985年后增加趋势减缓，这种变化在大城市区域表现得更为明显。
It is found that the aerosol optical depth over China showed an increasing trend but a slow upward trend after 1985, especially in the megacity regions.
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