Abstract
In order to know well the relationship between vegetation and water in North China, especially Beijing, with exceptional water resources, we studied the characteristics of flow production and sediment production under different rainfall intensities by artificial rainfall simulation device. Results showed that increase of rainfall intensity would prolong the whole process of flow production, and vegetation on the slope would delay that process. Within the same duration, total runoff volume of each runoff plot and rainfall intensity had significant linear relationship. When vegetation kept unchanged, runoff velocity increased significantly with the increase of rainfall intensity, and owing to the formation of low permeable layer, the velocity increased fiercely during the early 3 minutes, reached stable at 10 - 15 minute. With the same rain intensity, total sediment yield decreased with rise of vegetation coverage, but increased obviously with rise of rain intensity and effectiveness of controlling sediment about 1 m x 1 m Pinus tabulaeformis stand decreased firstly and then increased, while that about 1.5 m x 1.5 m Pinus tabulaeformis stand kept decreasing. Since the tags with A, B and C for 0.42 mm/min, 0.83 mm/min, 1.29 mm/min, order of sediment concentration of wasteland plot was B > C > A, and 1 m x 1 m Pinus tabulaeformis plot B > A > C. Through this study, some suggestions were expected to be provided for water balance of Beijing area and certain basis for construction of shelter forest.
Highlights
Beijing is located in the lower of earthy and rocky mountainous area in North China, core region of Jingjin-ji Economic District
We studied the characteristics of flow production and sediment production under different rainfall intensities with the method of artificial rainfall simulation which could get some data more quickly and effectively
These facts showed that both rainfall intensity and vegetation would affect characteristics of flow production [10,11,12], and with the same rainfall time, whole process of flow production would prolong along with increase of rainfall intensity, and vegetation on the slope would make this process begin later
Summary
Beijing is located in the lower of earthy and rocky mountainous area in North China, core region of Jingjin-ji Economic District. The area of soil and water loss water was still 4088.91 km, which reduced the fertility in soil, damaged the landscape, deposited sediment in reservoir and blocked watercourse, caused flooding and debris flow which threated the people’s life and property security. All of these harms restricted economic development of Beijing mountain area seriously [2]. Study based on natural rain cost more time To mend these defects, we studied the characteristics of flow production and sediment production under different rainfall intensities with the method of artificial rainfall simulation which could get some data more quickly and effectively. Basic data and theoretical basis were expected to be provided for future construction of protective forest system
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