2) The values of cloud property parameters (cloud particle size, water path) over arid and semi-arid region of Northwest China are smaller than that over Yangtze River delta area in April 2001.
西北干旱半干旱区2001年4月份云粒子尺寸、云水路径和光学厚度等云特性参量值小于同期长江三角洲地区的值。
参考来源 - 中国西北干旱半干旱区沙尘气溶胶对云特性的影响及云的辐射强迫效应·2,447,543篇论文数据，部分数据来源于NoteExpress
浑善达克沙地是我国北方干旱半干旱区的主要沙地和严重荒漠化地区之一。
Otindag Sandland is one of the main sandlands and among the most seriously desertificated region in semiarid area of China.
干旱半干旱区降水少，土壤水分亏缺，林木成活率低、保存率低、生长缓慢。
In the arid and semi arid area, the precipitation is little, soil moisture insufficient and low survival rate, low preserved rate and slow growing of trees.
土壤热通量在地表能量交换中扮演着重要角色，干旱半干旱区土壤热通量更加重要。
Soil heat flux plays an important role in energy flux exchange between land and atmosphere, especially in arid and semi-arid region.
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