水土保持研究2011，Vol.18Issue(3)：73-77,5.
北京山区主要树种枯落物水文功能特征研究
Hydrological Function of Litters of the Main Tree Species in Beijing Mountainous Area
摘要
Abstract
In order to study the hydrological function of litters of the main tree species in Beijing mountainous area,the litter reserve of Quersus variabilis stand, Pinus tabulaeformis stand, Platycladus orientalis stand and Robinia pseudoacacia stand were investigated and the water-holding processes of litter were measured in two ways. (1) The thickness of the litter layer of Quersus variabilis stand, Pinus tabulaeformis stand, Platycladus orientalis stand and Robinia pseudoacacia stand was 10. 5 cm, 4.0 cm, 3.8 cm and 2 cm. Their corresponding weight was 945 g/m2 ,803.3 g/m2, 1 024. 0 g/m2 , 239.8 g/m2. (2) The highest water-holding proportion of the four main tree species measured by soaking was 230.3％o, 165.1％, 161.9％ and 212. 0％. During the process, water-holding proportion's fastest growing period occurred in 0～2 h, in 2～6 h, the water-holding proportion grows slowly and after 6 h, the water-holding proportion hardly increases. (3) The highest water-holding proportion of the four main tree species measured by simulating rainfall was 334.3％, 331. 1％, 415.8％ and 259.9％, which are correspondingly greater than those measured by soaking. The process that the water-holding proportion changes with time by simulating rainfall method can be separated into 4 phases. In phase 1, the water-holding proportion increases rapidly; in phase 2, the proportion increases slowly; in phase 3, the water-holding proportion is getting saturated; in phase 4, the litter is totally saturated. (4) The water effective interception ability of litters can reflect the litter interception ability in natural rainfall. The ranking of four kinds of litter effective interception abilities is Pinus tabulaeformis ＞ Platycladus orientalis ＞Quersus variabilis ＞Robinia pseudoacacia. Effective interception ability of Pinus tabulaeformis is the the greatest, which is 12. 154 t/hm2. According to the experiment, there are some defects of the soaking way to measure the water-holding process of litters, which can be modified by the simulating rainfall method.关键词
枯落物/持水率/浸泡法/人工降雨法/北京山区Key words
litter/ water-holding proportion/ soaking method/ simulating rainfall method/ Beijing mountain area分类
农业科技引用本文复制引用
齐记,史宇,余新晓,郑江坤,李海光..北京山区主要树种枯落物水文功能特征研究[J].水土保持研究,2011,18(3):73-77,5.基金项目
国家林业局林业公益性行业科研专项(20080422) （20080422）
国家自然科学基金项目(40871136) （40871136）
