|
|
|
| Hydrological effects of forest litters of different forests in Beijing mountainous area |
| Wang Shiyong, Yu Xinxiao, Jia Guodong,Song Siming, Xu Juan, Li Qingyun |
| Key Laboratory of Soil & Water Conservation and Combating Desertification of Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing,China |
|
|
|
|
Abstract The hydrological effects of forest litters in Pinus tabulaeformis, Robinia pseudoacacia, and Platycladus orientalis forest communities in Zhuanghugou watershed, located in Tanghekou Town, Huairou District of Beijing, were studied in this article. Results show that: 1) The litters amounts and total thickness in Pinus tabulaeformis were the largest, 6.37t/hm2 and 4.0cm respectively, followed by Robinia pseudoacacia, and the least were in Platycladus orientalis. 2) The largest waterholding capacity of litter was Robinia pseudoacacia>Platycladus orientalis> Pinus tabulaeformis, and the largest waterholding rate was Robinia pseudoacacia > Pinus tabulaeformis > Platycladus orientalis. In the early half hour of water absorption of litter, waterholding rate increased rapidly, and then slightly decreased over time after the 4th to 5th hour. The effective water holding depth in Robinia pseudoacacia was the highest (2.6mm), and the lowest was in Platycladus orientalis (1.0mm). 3) It was evident that forest litters could prolong the surface runoff process. In the same slope degree, runoff generation time was given as follows: Robinia pseudoacacia > Pinus tabulaeformis > Platycladus orientalis>bare land, and was runoff velocity bare land>Platycladus orientalis > Pinus tabulaeformis > Robinia pseudoacacia. The runoff amount in bare land was 1.04 to 1.46 times as great as the three kinds of forests.
|
|
Received: 06 May 2011
|
|
|
|
|
|
|
