北京市3个区域油松枯落物保水功能对比分析

调查了北京密云水库、八达岭林场和十三陵林场油松林枯落物储量调查,研究了其枯落物持水特性,得到了3个区域油松林枯落物总储量、最大持水量、最大持水率和有效拦蓄量等水文特征参数。结果表明,油松枯落物总储量、最大持水量均表现为:八达岭林场十三陵林场密云水库上游,最大持水率、平均吸水率、有效拦蓄量均表现为:十三陵林场八达岭林场密云水库上游;3个区域油松林枯落物保水功能均比较差,尤其是密云水库;降雨量小于临界值时,八达岭林场油松林枯落物保水性能最好;降雨量大于临界值时,十三陵林场油松林枯落物保水性能最好。十三陵林场油松林枯落物保水功能优于其它两个区域。

Water Conserving Function of Pinus Tabulaeformis Litters in Three Regions of Beijing City

Gross litter reserves and hydrological characteristic parameters, such as the maximum water capacity, maximum water holding rate and modified interception amount, were studied through the water holding experiment and litter reserves survey on Pinus tabulaeformis forest stands in the Miyun Reservoir, Badaling Forestry Center and Shisanling Forestry Center in Beijing City. Results showed that the three regions, in order of decreasing gross litter reserve and maximum water capacity, were Badaling Forestry Center, Shisanling Forestry Center and Miyun Reservoir. In addition, the maximum water holding rate, average water absorption rate and modified interception amount were the highest in Shisanling Forestry Center, followed by Badaling Forestry Center, and the lowest in Miyun Reservoir. However, the water conserving function of Pinus tabulaeformis litter was relatively poor in the three regions, especially in the Miyun Reservoir. When rainfall is less than the critical value, the water conserving function of litter was best in Badaling Forestry Center; when rainfall is larger than the critical value, the water conserving function was best in Shisanling Forestry Center. The water conserving function of Pinus tabulaeformis in Shisanling Forestry Center was better than other two regions.