Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL077055 |
A Mechanism of Land Degradation in Turf-Mantled Slopes of the Tibetan Plateau | |
Okin, Gregory S.1; 39;Odorico, Paolo2 | |
2018-05-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:9页码:4041-4048 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Peoples R China |
英文摘要 | Kobresia pygmaea meadows are typical of Tibetan Plateau landscapes in the 3,000 to 5,500 m elevation range and constitute the most extensive alpine ecosystem in the world. Kobresia pygmaea forms turf mats that stabilize the surface and shelter the underlying soils from water erosion. Large tracts of the Plateau, however, exhibit signs of ongoing degradation of the turf and erosion of the underlying soil. Despite the crucial role played by K. pygmaea turf mats in the stabilization of the headwaters of major Asian rivers, the mechanisms responsible for their degradation remain poorly investigated. Here we develop a process-based model of land degradation of Tibetan Plateau slopes, which accounts for (i) turf cracking, (ii) water flow concentration in the cracks, (iii) crack widening by scouring, and (iv) sheet-flow erosion. As expected, soil erosion increases with the slope and drainage area (hence the observation of stronger erosion in relatively steep downhill sites). Model simulations indicate that with a sensible set of parameters representative of soil and hydrologic conditions in the region, Tibetan Plateau landscapes are vulnerable to turf mat degradation and soil erosion. As soon as polygonal cracks develop, water flow widens them until the landscape is completely barren. At this point sheet flow eventually erodes the mineral soil leaving behind a highly degraded landscape. |
英文关键词 | Kobresia turf Tibet erosion hillslope |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000434111700033 |
WOS关键词 | INTENSITY ; ECOSYSTEM ; CHINA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27755 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Los Angeles, Dept Geog, Los Angeles, CA 90024 USA; 2.Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA; 3.Lanzhou Univ, Sch Life Sci, State Key Lab Grassland Agroecosyst, Lanzhou, Gansu, Peoples R China |
推荐引用方式 GB/T 7714 | Okin, Gregory S.,39;Odorico, Paolo. A Mechanism of Land Degradation in Turf-Mantled Slopes of the Tibetan Plateau[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(9):4041-4048. |
APA | Okin, Gregory S.,&39;Odorico, Paolo.(2018).A Mechanism of Land Degradation in Turf-Mantled Slopes of the Tibetan Plateau.GEOPHYSICAL RESEARCH LETTERS,45(9),4041-4048. |
MLA | Okin, Gregory S.,et al."A Mechanism of Land Degradation in Turf-Mantled Slopes of the Tibetan Plateau".GEOPHYSICAL RESEARCH LETTERS 45.9(2018):4041-4048. |
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