Straw mulch can induce greater soil losses from loess slopes than no mulch under extreme rainfall conditions
文献类型：期刊论文
| 作者 | Rahma, Abbas E.1,2; Wang, Wei4 ; Tang, Zejun1; Lei, Tingwu1,3; Warrington, David N.3; Zhao, Jun3
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| 刊名 | AGRICULTURAL AND FOREST METEOROLOGY
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| 出版日期 | 2017-01-15 |
| 卷号 | 232页码:141-151 |
| 关键词 | Straw mulch Mulch rate Simulated rain Rill Erosion Runoff Loess soil |
| ISSN号 | 0168-1923 |
| DOI | 10.1016/j.agrformet.2016.07.015 |
| 通讯作者 | Lei, Tingwu(leitingwu@cau.edu.cn) |
| 英文摘要 | Mulching a soil has long been considered an effective way of reducing soil and water losses as compared to an un-mulched soil. However, under certain conditions of extreme rainfalls, a soil may be more susceptible to rill erosion under a straw mulch cover, where the mulch can concentrate overland flow, than without such a cover if the soil developed a resistant surface seal. This study used two typical soils of the Loess Plateau of China (a silt loam and a clay loam) to study mulch induced erosion under intense simulated rainstorms of 100, 140 and 180 mm h(-1) amounting to a rainfall depth of 60 mm on 5-m slopes set at different gradients. Under three mulch rates tested (0, 0.2, and 0.8 kg m(-2)), application of mulch always reduced runoff from the soils. No rills were formed in the silt loam soil without a mulch cover under any of the experimental rainfall conditions due to the formation of a seal that resisted rill formation. However, under the 0.8 kg m(-2) mulch treatment, rills were initiated under all but the least severe experimental conditions combinations and soil losses exceeded those from the soil without mulch. In one case, the soil loss under the mulch was almost three times that from the soil without mulch. In the clay loam soil, which developed a more erodible seal than the silt loam soil, rills were formed under all mulch treatments and rainfall intensity and slope conditions, with the exception of the mulch covered soil under one set of conditions. At the end of the 60-mm rainstorm and under the most intense conditions, the total soil loss from the clay loam soil under mulch (0.8 kg m(-2)) was less than 50% of that from the soil without mulch and in all cases total soil loss was reduced by mulch; however, towards the end of the storm, the soil loss rates, which had been increasing, exceeded those of the un-mulched soil. These phenomena were attributed to the relatively high resistance to rill formation of the surface seal developed on the silt loam soil as compared to the soil without a seal under the high mulch rate, which protected the soil from raindrop impact. Rill initiation was more likely to occur under the mulch due to the increased surface roughness of a soil without a seal and the presence of the mulch, and to individual straws of the mulch laying directly on the soil surface diverting and concentrating soil surface runoff. The results suggest that, with a greater amount of runoff, the same phenomenon may occur on the clay loam soil, which was more susceptible to rill formation under all mulch treatments and developed a less resistant seal. Reducing the mulch rate when severe runoff events are likely from soils similar to the silt loam should avoid such large soil losses. However, for soils more susceptible to rill formation under mulch, such as the clay loam in this study, this may not be effective. Future studies, and especially field studies, should address this issue. (C) 2016 Published by Elsevier B.V. |
| WOS关键词 | INTERRILL EROSION ; STEEP SLOPES ; FLOW ; SEDIMENT ; TRANSPORT ; RUNOFF |
| 资助项目 | Knowledge Innovation Program of the Chinese Academy of Sciences[KZCX2-YW-442] ; National Natural Science Foundation of China[41230746] ; National Natural Science Foundation of China[51321001] |
| WOS研究方向 | Agriculture ; Forestry ; Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000389089800012 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | Knowledge Innovation Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/65719]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Lei, Tingwu |
| 作者单位 | 1.China Agr Univ, Coll Water Resources & Civil Engn, Beijing 100083, Peoples R China 2.Sudan Univ Sci & Technol, Dept Agr Engn, Coll Agr Studies, Khartoum, Shambat, Sudan 3.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi Provinc, Peoples R China 4.China Agr Univ, Coll Engn, Beijing 100083, Peoples R China |
| 推荐引用方式 GB/T 7714 | Rahma, Abbas E.,Wang, Wei,Tang, Zejun,et al. Straw mulch can induce greater soil losses from loess slopes than no mulch under extreme rainfall conditions[J]. AGRICULTURAL AND FOREST METEOROLOGY,2017,232:141-151. |
| APA | Rahma, Abbas E.,Wang, Wei,Tang, Zejun,Lei, Tingwu,Warrington, David N.,&Zhao, Jun.(2017).Straw mulch can induce greater soil losses from loess slopes than no mulch under extreme rainfall conditions.AGRICULTURAL AND FOREST METEOROLOGY,232,141-151. |
| MLA | Rahma, Abbas E.,et al."Straw mulch can induce greater soil losses from loess slopes than no mulch under extreme rainfall conditions".AGRICULTURAL AND FOREST METEOROLOGY 232(2017):141-151. |
入库方式： OAI收割
来源：地理科学与资源研究所
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