关键词: 天宝岩国家级自然保护区, 泥炭沼泽, 苔藓枯落物层, 持水特性

Abstract: [Objective] The aim of the study was to clarify the water-holding capacity of soils and litters of 4 different Sphagnum wetlands(Palhinhaea cernua, Pllostachys heteroclada, Juncus effuses and Sphagnum magellanicum) in the Tianbaoyan National Nature Reserve in Fujian Province and to provide theoretical basis for protection and utilization of Sphagnum wetlands in the area. [Methods] Four different types of Sphagnum wetlands were used in this study. Soil and litter samples were collected to measure soil chemical properties, water-holding capacity characteristics. [Results] The soil bulk density of the 4 types of Sphagnum wetlands followed an order of P. cernua > S. magellanicum > P. heteroclada > J. effuses. The total porosity of soil was in the order of P. heteroclada > S. magellanicum > J. effuses > P. cernua. The soil water storage was followed the pattern of P. heteroclada > S. magellanicum > P. cernua > J. effuses. Litter water-holding capacity had a visible logarithmic correlation with immersion time and there existed a significant function relationship between water absorption rate and immersion time. The natural waterholding capacity, natural water-holding rate, maxima water-holding capacity, maxima water-holding rate of litter were 5.5~16.1 t/hm², 31.8%~47.2%, 20.1~198.4 t/hm² and 330.0%~805.5%, respectively. [Conclusion] The comprehensive analysis of water-holding capacity of 4 different types of Sphagnum wetlands indicated that S. magellanicum type has a relatively high water-holding capacity and is more beneficial to water conservation.

Key words: Tianbaoyan National Nature Reserve, Sphagnum wetlands, litter layer, water-holdingcapacity