三峡库区降雨特征和林草覆被格局对坡面水沙产出的影响
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作者单位:

1.重庆师范大学地理与旅游学院;2.西南大学地理科学学院;3.中国科学院、水利部成都山地灾害与环境研究所

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S157.1

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重庆市杰出青年科学基金(cstc2021jcyj-jqX0026);西南大学先导计划青年团队项目(SWU-XDJH202306)


Impacts of Rainfall Characteristics and Vegetation Cover Patterns on Hillslope Runoff and Sediment Yields in the Three Gorges Reservoir Area
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1.School of Geography and Tourism,Chongqing Normal University;2.Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station,School of Geographical Sciences,Southwest University

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    摘要:

    [目的]三峡库区是长江上游重要生态屏障和国家级水土流失重点治理区。重大生态修复工程的实施,植被建设成效明显,而恢复植被的调水保土效应缺乏原位观测定量研究;人地矛盾突出和乡村产业发展对林下土地资源优化利用提出了新需求,其对林地水源涵养和水土保持功能的影响尚不明晰。[方法]以三峡库区典型退耕林地为研究对象,设置林下全坡草本覆盖格局(QF)、上坡裸地+下坡草本覆盖格局(XF)、等高横坡草本条带覆盖格局(TF)、全坡无草本覆盖格局(WF)4种林草覆被的径流小区,开展24场侵蚀性降雨事件的坡面产流产沙野外观测,辨识降雨特征和林草覆被格局对坡面产水产沙的影响。[结果]结果表明:(1)24场侵蚀性降雨分为A雨型(雨量小、强度较大、历时短)、B雨型(雨量大、强度大、历时短)和C雨型(雨量小、强度小、历时长)3类。A雨型发生频率最高,为45.83%,B雨型累积降雨量最大,占总降雨量的63.44%。(2)4种林草覆被格局的累积径流深和累积侵蚀量总体呈现QF

    Abstract:

    [Objectives] The Three Gorges Reservoir area is an important ecological barrier in the upper reaches of the Yangtze River and a national key area for soil and water erosion control. With the implementation of major ecological restoration projects, the effectiveness of vegetation construction has been obvious, but the water regulation and soil conservation effects of restored vegetation lack in situ observation and quantitative research. The prominent contradiction between man and land and the development of rural industries have put forward new demands for the optimal utilization of understory land resources, and their impact on the water conservation and soil erosion control functions is not yet clear. [Methods] Taking a typical fallow forest in the Three Gorges Reservoir Area as the research object, four runoff plots with full-slope herbaceous cover (QF), upper-slope bare ground + lower-slope herbaceous cover (XF), equidistant herbaceous strip cover (TF), and full-slope herbless coverage (WF), were set up to carry out field observation of slope runoff and sand production in 24 erosive rainfall events and to identify the effects of erosive rainfall and vegetation cover patterns on hillslope runoff and sediment yields. [Results] The results show that:(1) The 24 erosive rainfall events were classified into three categories, including A-type (small rainfall, heavy rainfall intensity, and short duration), B-type (large rainfall, heavy rainfall intensity, and short duration), and C-type (small rainfall, light rainfall intensity, and long duration). A-type is the rain type with the highest frequency, with a frequency of 45.83%. The cumulative rainfall of B-type is the largest, accounting for 63.44% of the total rainfall. (2) The cumulative runoff depth and cumulative erosion volume of the four vegetation cover patterns generally showed QF

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  • 收稿日期:2023-11-05
  • 最后修改日期:2023-12-11
  • 录用日期:2023-12-14
  • 在线发布日期: 2024-04-29
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