Implications of surface properties for dust emission from gravel deserts (gobis) in the Hexi Corridor
Implications of surface properties for dust emission from gravel deserts (gobis) in the Hexi Corridor
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河西走廊砾石荒漠（戈壁）地表特性对沙尘排放的影响
DOI：
10.1016/j.geoderma.2016.01.011
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发表时间：
2016-04
期刊：
影响因子：
6.1
通讯作者：
Jiang, Chanwen
中科院分区：
文献类型：
--
作者：
Dong, Zhibao;Li, Jiyan;Qian, Guangqiang;Jiang, Chanwen
砾石沙漠（戈壁）可能是中国的主要沙尘源，其面积几乎与沙质沙漠相同。砾石沙漠和沙质沙漠之间的明显区别在于表面沉积物的主要粒度：沙质沙漠为细粒，而砾石沙漠为粗粒。潜在输沙量、砾石覆盖度以及砾石荒漠表层沉积物平均粒径是影响沙尘释放的主要因素。然而，关于这些属性的可用数据很少。在本研究中，我们使用 ImageJ 软件估算了地表照片中的砾石覆盖度，确定了砾石（直径 > 2 mm）占总重量的比例，并描述了中国北方河西走廊研究区的粒度分布。我们发现五个子区域中砾石总重量的比例存在统计学上的显着差异。该比例占总数的 22% 至 91%（66 ± 17%；平均值 ± 标准差），大多数样本 (73%) 的比例范围为 40% 至 80%。砾石覆盖范围为 15% 至 87% (52 ± 17%)，这在先前研究中产生最大空气动力粗糙度的范围内。表层沉积物中砂质物质主要为中砂，占样品总量的52.5%。在大多数砾石沙漠中，潜在的沙子输送量超过 200 个矢量单位，并且 75% 的研究地点具有物理土壤结皮。高砾石覆盖率和地表结皮频率可能会减少河西走廊砾石沙漠的沙尘排放。
Gravel deserts (gobis) may be primary dust sources in China, where they occupy almost the same area as sandy deserts. The obvious difference between gravel and sandy deserts is the dominant grain size in the surface sediments: fine in sandy deserts versus coarse in gravel deserts. Potential sand transport, gravel cover, and the mean grain size of the surface sediments of gravel deserts are the main factors that affect dust release. However, little data is available on these properties. In the present study, we estimated gravel cover in surface photographs using ImageJ software, determined the proportion of the total weight accounted for by gravel (diameter > 2 mm), and described the grain size distribution for study areas in the Hexi Corridor of northern China. We found statistically significant differences between the proportions of total weight as gravel among five sub-regions. This proportion ranged from 22 to 91% of the total (66 ± 17%; mean ± SD), and the proportions in most of the samples (73%) ranged from 40 to 80%. The gravel cover ranged from 15 to 87% (52 ± 17%), which was within the range in previous research that produced maximum aerodynamic roughness. The sandy material in the surface sediments was mainly medium sand, which accounted for 52.5% of the total sample. Potential sand transport was > 200 vector units in most gravel deserts, and 75% of the study sites had a physical soil crust. The high gravel cover and frequency of surface crusts is likely to decrease dust emission from the gravel deserts of the Hexi Corridor.
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影响因子：
1.6
作者：
Y. Shao;Raupach;J. Leys
通讯作者：
Y. Shao;Raupach;J. Leys
影响因子：
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作者：
Z. Dong;Qing-song Mu;Xiaopiu Liu
通讯作者：
Z. Dong;Qing-song Mu;Xiaopiu Liu
影响因子：
2.7
作者：
Q. Jianjun;Huang Ning;D. Guangrong;Z. Weimin
通讯作者：
Q. Jianjun;Huang Ning;D. Guangrong;Z. Weimin
影响因子：
1.6
作者：
J. Mabbutt
通讯作者：
J. Mabbutt
影响因子：
4.4
作者：
MARTICORENA, B;BERGAMETTI, G
通讯作者：
BERGAMETTI, G