| The effect of restored microbiotic crusts on erosion of soil from a desert area in China | |
| Zhang, Z.1; Dong, Z.1; Zhao, A.1; Yuan, W.1; Han, L.2 | |
| 刊名 | JOURNAL OF ARID ENVIRONMENTS
 |
| 2008-05-01 | |
| 卷号 | 72期号:5页码:710-721 |
| 关键词 | aerodynamic roughness length Tengger Desert threshold velocity wind profiles wind velocity for the initiation of saltation |
| ISSN号 | 0140-1963 |
| DOI | 10.1016/j.jaridenv.2007.09.001 |
| 通讯作者 | Dong, Z.(zbdong@ns.lzb.ac.cn) |
| 英文摘要 | Samples of microbiotic crusts were collected along the northern part of the Zhongwei-Gantang section of the Baotou-Lanzhou railway, which lies at the southeastern fringe of China's Tengger Desert. We collected intact crust samples, let them recover for 1 year, then created five levels of disturbance: no disturbance (intact crusts), light disturbance (disturbance of 10% and 20% of the total area), moderate disturbance (40% disturbance), and severe disturbance (80% disturbance). We used these samples to simulate the effect of microbiotic crusts on wind erosion. Wind tunnel experiments let us determine the wind velocity required for the initiation of saltation, the threshold velocity (u*), the aerodynamic roughness length (z(0)), and the wind profile above sand surfaces covered by microbiotic crusts. The wind velocity for the initiation of saltation with an intact microbiotic crust was about 19 m s(-1), which is greater than the value of 13.08 in s(-1) for shifting sands. z(0) was between 0.03 and 0.13 cm, which wits larger than the value of 0.0288 for shifting sands, and reached its maximum (0.13 cm) at the 40% disturbance level, and it. was between 0.15 and 1.21 m s(-1). The relationships between u*, free-stream wind velocity (u), and z(0) followed the equations u* = a + bu and z(0) = 0.01563(l + U*)(3.49341). The wind profile above the surface wits divided into three sections, with the greatest changes in wind speed occurring below a height of 0.1 m. (c) 2007 Elsevier Ltd. All rights reserved. |
| 收录类别 | SCI |
| WOS关键词 | WIND EROSION ; SAND TRANSPORT ; ALGAE ; VEGETATION ; THRESHOLD ; ROUGHNESS ; FLUX |
| WOS研究方向 | Environmental Sciences & Ecology |
| WOS类目 | Ecology ; Environmental Sciences |
| 语种 | 英语 |
| 出版者 | ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD |
| WOS记录号 | WOS:000255186900014 |
| 内容类型 | 期刊论文 |
| URI标识 | http://www.corc.org.cn/handle/1471x/2556064 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Dong, Z. |
| 作者单位 | 1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Key Lab Desert & Desertificat, Lanzhou 730000, Gansu Province, Peoples R China 2.Climat Ctr, Lanzhou 730020, Gansu Province, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Z.,Dong, Z.,Zhao, A.,et al. The effect of restored microbiotic crusts on erosion of soil from a desert area in China[J]. JOURNAL OF ARID ENVIRONMENTS,2008,72(5):710-721. |
| APA | Zhang, Z.,Dong, Z.,Zhao, A.,Yuan, W.,&Han, L..(2008).The effect of restored microbiotic crusts on erosion of soil from a desert area in China.JOURNAL OF ARID ENVIRONMENTS,72(5),710-721. |
| MLA | Zhang, Z.,et al."The effect of restored microbiotic crusts on erosion of soil from a desert area in China".JOURNAL OF ARID ENVIRONMENTS 72.5(2008):710-721. |
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