长白山北坡垂直植被带表土植硅体组合研究

Characteristics of Phytolith Assemblages in Surface Soil from the Vertical Forest Zones of the Changbai Mountains

长白山垂直分布的植被是欧亚大陆从温带到寒带植被水平地带性的缩影。对其北坡不同海拔高度植被带土壤中的植硅体进行初次研究,结果发现,该山北坡海拔700m到2630m的土壤中发育了形态和数量丰富的植硅体。不同植被带植硅体组合的含量各不相同,主要特征表现为随海拔升高示冷型的植硅体含量整体呈上升趋势,而示暖型的植硅体含量整体呈下降趋势。温泉附近土壤中的植硅体则表现出明显的与其上下相邻地点不同的特点。它对中国东北第四纪沉积物中植硅体组合的研究及第四纪古植被和古环境的重建可提供重要的基础性资料。

The vertical vegetation distribution in the Changbai Mountains is a horizontal epitome from temperate to frigid zones in Eurasia. Researches on primary phytolith in the surface soil of different vegetation zones on the north slope are reported in this paper. Samples were collected from 700 m to 2630 m in elevation, and plentiful phytoliths of different kinds were recognized. The contents of phytolith assemblages are varied in different vegetation zones. The contents of phytoliths that indicate chilliness increase with the rising of altitude, while things are just the opposite for those showing warm climate. Near the hot springs on the north slope of the Changbai Mountains, the phytoliths in soil are obviously different from those in neighboring places. Phytolith studies in this area will provide valuable basic data for the phytolith research in Quaternary sediments of Northeast China, and can play an important role in the reconstruction of the paleo-vegetation and paleo-environment.