地理研究 ›› 2009, Vol. 28 ›› Issue (5): 1197-1207.doi: 10.11821/yj2009050006

• 地表过程研究 • 上一篇    下一篇

海南省松涛水库流域土壤侵蚀及控制方案

曾红娟1, 杨胜天1, 王 凌2, 郑东海1, 张翠萍2, 王雪蕾1, 高云飞1   

  1. 1. 遥感与地理信息系统研究中心,环境遥感与数字城市北京市重点实验室, 北京师范大学地理学与遥感科学学院,北京 100875;
    2. 海南岛环境科学研究院,海口 100053
  • 收稿日期:2009-02-18 修回日期:2009-06-15 出版日期:2009-09-25 发布日期:2009-09-25
  • 作者简介:曾红娟(1982-),女,贵州德江人,博士研究生。主要研究方向为生态水文遥感。 E-mail:zhj_eve@126.com *通讯作者 : 杨胜天(1965-),男,贵州贵阳人,教授,博士生导师。主要从事遥感和GIS应用研究。 E-mail:yangshengtian@bnu.edu.cn
  • 基金资助:

    国家自然科学基金项目(40671123)

The situation and control scheme of soil erosion in Songtao Reservoir Basin of Hainan Island

ZENG Hong-juan1, YANG Sheng-tian1, WANG Ling2, ZHENG Dong-hai1, ZHANG Cui-ping2, WANG Xue-lei1, GAO Yun-fei1   

  1. 1. Research Center for Remote Sensing and GIS, Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities, School of Geography, Beijing Normal University, Beijing 100875, China;
    2. Environmental Sciences Academy of Hainan Province, Haikou 570206, China
  • Received:2009-02-18 Revised:2009-06-15 Online:2009-09-25 Published:2009-09-25
  • Supported by:

    国家自然科学基金项目(40671123)

摘要:

采用RS和GIS技术,基于USLE方程实现了热带地区海南岛松涛水库流域2003~2005年平均土壤侵蚀的定量模拟,通过情景分析研究了流域土壤侵蚀控制方案。结果表明:流域内潜在土壤侵蚀量约为4261万t/a,超过容许土壤流失量的60倍;在植被的保护下,现有年均土壤侵蚀量约为51.46万t/a,主要集中在退化的林地、浆纸林和橡胶林;流域平均土壤侵蚀模数略低于容许土壤流失量,但空间分布不均,部分区域侵蚀发育强烈;如对经济林、园地和耕地采取水土保持措施或恢复林草植被,能有效控制流域内土壤侵蚀,分别减少侵蚀量22.46万t和14.15万t,减少侵蚀面积98.48km2和65.90km2

关键词: 土壤侵蚀, USLE, 控制方案, 热带, 松涛水库流域

Abstract:

As the most important water source region in Hainan Island, the Songtao Reservoir Basin has witnessed significant increases in both soil erosion and sediment in local rivers due to the exploration and utilization in recent years, so it is very important to study the situation and the control scheme of soil erosion in the basin for the protection of water environment. Taking Remote Sensed Imagery and Digital Elevation Model as basic data resource, we accomplished the quantitative simulation and analysis on the soil erosion in the Songtao Reservoir Basin based on Universal Soil Erosion Equation using Remote Sensing and Geographic Information System techniques through the wide investigation and experiments. Then we put forward a scheme for soil erosion control. The results showed that: (1) Potential soil erosion in the Songtao Reservoir Basin was about 42.6 million tons per year which was about more than 60 times of soil loss tolerance. Under the protection of vegetation, the soil erosion was about 514.6 thousand tons per year and mainly occurred to the degraded forestry, Eucalyptus forest and rubber plantation. The soil erosion in Eucalyptus forest plantation was the most severe. (2) The average soil erosion modulus in the basin was a little smaller than soil loss tolerance, but distributed unevenly. Some areas located in Xishui village were strongly eroded and reached acuity degree. (3) Vegetation was a main factor that controls soil erosion, therefore it is very essential to strengthen the protection of vegetation, especially those natural forests. According to the scene analysis, the establishment of relevant soil and water conservation facilities in plantation could help decrease soil erosion and loss coverage by 224.6 thousand tons per year and 98.48 km2 respectively, while the rehabilitation of the destroyed forests and bare land could contribute to a reduction of soil losses by 65.9 km2 and about 141.5 thousand tons per year. Both methods could control the soil erosion and non-point pollution effectively. From what is said above, we can draw a conclusion that the Songtao Reservoir Basin is facing serious potential soil erosion and more attention should be paid to taking specific measures to control soil erosion when this area is exploited.

Key words: soil erosion, USLE, control scheme, tropic, the Songtao Reservoir Basin