【摘要】 为了探讨莱州湾南岸滩涂上不同密度柽柳林(Tamarixchinensis)地的土壤理化性质,以山东昌邑海洋生态特别保护区内的低密度(2 200株/hm2)、中密度(3 600株/hm2)和高密度(4 900株/hm2)柽柳林地为研究对象,采用样方法,采集0～30 cm深度和30～60 cm深度土层的土壤样品,测定分析土壤样品的理化指标。研究结果表明,在垂直结构上,3种密度柽柳林地上层(0～30 cm深度层)土壤总孔隙度、毛管孔隙度、有机质含量、总有机碳含量和各种养分含量显著大于下层(30～60 cm深度层)土壤,而上层土壤容重、含水量、含盐量和pH则显著小于下层土壤;中密度柽柳林地的0～60 cm深度土壤的孔隙度、含水量、有机质含量、总有机碳含量和各种养分含量都相对最大,低密度柽柳林地的相应指标都相对最小;在3种密度柽柳林地中,土壤容重分别与毛管孔隙度、含水量显著负相关,土壤含盐量和pH分别与有机质含量、总有机碳含量以及各种养分含量显著负相关,土壤有机质含量和总有机碳含量分别与土壤各种养分含量显著正相关;柽柳林密度可以显著影响土壤理化性质,中密度柽柳林改良滩涂土壤的效果相对最佳,其能改善滩涂土壤的物理结构,提升土壤贮存、供应养分能力,减少土壤中的盐碱含量。更多还原

【Abstract】 The soil physicochemical characteristics of the lands with high(4 900 trees/hm2), medium(3 600 trees/hm2), and low(2 200 trees/hm2) densities’ Tamarix chinensis shrubs in the coastal intertidal zone, Changyi National Special Marine Ecology Reserve, Shandong province were studied. Fifteen 10 m×10 m quadrats were set up to collect soil samples with the depths of 0-30 cm and 30-60 cm, and the physical and chemical properties of the soil samples were analyzed. The results showed that the soil porosity, contents of organic matter, total organic carbon and various nutrients in the upper soil layer(0-30 cm depth) of lands with high, medium and low densities’ Tamarix chinensis shrubs were significantly higher than those in the lower layer(30-60 cm depth), while the soil bulk density, water content, soil salinity and pH in the upper soil layer were significantly lower than those in the lower layer. Soil porosity, contents of water, organic matter, total organic carbon and various nutrients in both soil layers in the land with medium density’s Tamarix chinensis shrub were the maximums relatively, followed by those with high and low densities’ Tamarix chinensis shrubs. In the lands with high, medium and low densities’ Tamarix chinensis shrubs, the soil bulk density was negatively correlated with soil water content and capillary porosity; the soil salinity and pH both were negatively correlated with contents of organic matter, total organic carbon and various nutrients; the contents of organic matter, total organic carbon both were positively correlated with various nutrients in the soil. Densities of Tamarix chinensis shrubs had significant effects on the soil physical and chemical properties of the coastal intertidal zone, and medium density’s Tamarix chinensis shrub had the best effect on soil improvement, followed by high and low densities’ Tamarix chinensis shrubs. The medium density’s Tamarix chinensis shrub could improve the physical structure of the soil, and to enhance the ability of soil to support plant growth and development, reduce soil salinity, and improve soil nutrients in the coastal intertidal zone, Changyi National Special Marine Ecology Reserve.更多还原