中国地理科学 ›› 2017, Vol. 27 ›› Issue (4): 569-576.doi: 10.1007/s11769-016-0829-7

• 论文 • 上一篇    下一篇

Influence of Vegetation on Runoff and Sediment in Wind-water Erosion Crisscross Region in the Upper Yellow River of China

WANG Jinhua1,2, LI Zhanbin1, YAO Wenyi2, DONG Guotao2   

  1. 1. Xi'an University of Technology, Xi'an 710048, China;
    2. Key Laboratory of Soil and Water Loss Process and Control on the Loess Plateau of Ministry of Water Resources, Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China
  • 收稿日期:2015-11-30 修回日期:2016-03-15 出版日期:2017-08-27 发布日期:2017-06-30
  • 通讯作者: WANG Jinhua.E-mail:wangjh_yr@126.com E-mail:wangjh_yr@126.com
  • 基金资助:

    Under the auspices of National Basic Research Program of China (No. 2011CB403303), Innovation Scientists and Technicians Troop Construction Projects of Henan Province (No. 162101510004), Foundation of Yellow River Institute of Hydraulic Research of China (No. HKY-2011-15)

Influence of Vegetation on Runoff and Sediment in Wind-water Erosion Crisscross Region in the Upper Yellow River of China

WANG Jinhua1,2, LI Zhanbin1, YAO Wenyi2, DONG Guotao2   

  1. 1. Xi'an University of Technology, Xi'an 710048, China;
    2. Key Laboratory of Soil and Water Loss Process and Control on the Loess Plateau of Ministry of Water Resources, Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China
  • Received:2015-11-30 Revised:2016-03-15 Online:2017-08-27 Published:2017-06-30
  • Contact: WANG Jinhua.E-mail:wangjh_yr@126.com E-mail:wangjh_yr@126.com
  • Supported by:

    Under the auspices of National Basic Research Program of China (No. 2011CB403303), Innovation Scientists and Technicians Troop Construction Projects of Henan Province (No. 162101510004), Foundation of Yellow River Institute of Hydraulic Research of China (No. HKY-2011-15)

摘要:

All characteristics of vegetation, runoff and sediment from 1960 to 2010 in the Xiliu Gully Watershed, which is a representative watershed in wind-water erosion crisscross region in the upper reaches of the Yellow River of China, have been analyzed in this study. Based on the remote sensing image data, and used multi-spectral interpretation method, the characteristics of vegetation variation in the Xiliu Gully Watershed have been analyzed. And the rules of precipitation, runoff and sediment's changes have been illuminated by using mathematical statistics method. What's more, the influence mechanism of vegetation on runoff and sediment has been discussed by using the data obtained from artificial rainfall simulation test. The results showed that the main vegetation type was given priority to low coverage, and the area of the low vegetation coverage type was reducing year by year. On the country, the area of the high vegetation coverage type was gradually increasing. In a word, vegetation conditions had got better improved since 2000 when the watershed management project started. The average annual precipitation of the river basin also got slightly increase in 2000-2010. The average annual runoff reduced by 37.5%, and the average annual sediment reduced by 73.9% in the same period. The results of artificial rainfall simulation tests showed that the improvement of vegetation coverage could increase not only soil infiltration but also vegetation evapotranspiration, and then made the rainfall-induced runoff production decrease. Vegetation root system could increases the resistance ability of soil to erosion, and vegetation aboveground part could reduce raindrop kinetic energy and splash soil erosion. Therefore, with the increase of vegetation coverage, the rainfall-induced sediment could decrease.

关键词: vegetation coverage, runoff, sediment, infiltration rate, wind-water erosion crisscross region

Abstract:

All characteristics of vegetation, runoff and sediment from 1960 to 2010 in the Xiliu Gully Watershed, which is a representative watershed in wind-water erosion crisscross region in the upper reaches of the Yellow River of China, have been analyzed in this study. Based on the remote sensing image data, and used multi-spectral interpretation method, the characteristics of vegetation variation in the Xiliu Gully Watershed have been analyzed. And the rules of precipitation, runoff and sediment's changes have been illuminated by using mathematical statistics method. What's more, the influence mechanism of vegetation on runoff and sediment has been discussed by using the data obtained from artificial rainfall simulation test. The results showed that the main vegetation type was given priority to low coverage, and the area of the low vegetation coverage type was reducing year by year. On the country, the area of the high vegetation coverage type was gradually increasing. In a word, vegetation conditions had got better improved since 2000 when the watershed management project started. The average annual precipitation of the river basin also got slightly increase in 2000-2010. The average annual runoff reduced by 37.5%, and the average annual sediment reduced by 73.9% in the same period. The results of artificial rainfall simulation tests showed that the improvement of vegetation coverage could increase not only soil infiltration but also vegetation evapotranspiration, and then made the rainfall-induced runoff production decrease. Vegetation root system could increases the resistance ability of soil to erosion, and vegetation aboveground part could reduce raindrop kinetic energy and splash soil erosion. Therefore, with the increase of vegetation coverage, the rainfall-induced sediment could decrease.

Key words: vegetation coverage, runoff, sediment, infiltration rate, wind-water erosion crisscross region