河北坝上地区植硅体空间分布特征及其环境意义

了解不同区域表土植硅体组合特征及其对气候环境的响应过程，是利用植硅体指标恢复古植被和古气候的基础。本文通过对河北坝上地区103块表土植硅体的分析鉴定，共统计出棒型、尖型、帽型、鞍型、哑铃型、齿型、块状、扁平状、扇型、三棱柱型、锥骨状、导管型、弓型和特殊型14种植硅体类型，其中植硅体类型主要以棒型和尖型为主，而短细胞植硅体的含量较少。通过研究区相对暖湿区、暖干区、冷湿区和冷干区的表土植硅体组合特征对比发现，在相对较冷的区域棒型量含量较高，在相对较暖的区域扇型、扁平状和鞍型含量较高，在相对较湿的区域尖型含量较高，在相对暖湿的区域块状含量较高，在相对冷湿的区域齿型含量较高，这表明研究区表土植硅体组合特征对气候环境响应较为敏感。本研究成果可为重建坝上地区古植被和古气候提供基础资料。

Spatial distribution characteristics of phytolith in the topsoil of Bashang area, Hebei Province and their environmental significance

Understanding the topsoil phytoliths assemblages in different regions and their response to climate change, is the basis for using phytolith indices to recover paleovegetation and paleoclimate. The phytolith assemblages were analysed based on 103 topsoil samples from the Bashang area, Hebei Province, and classified into 14 types, including elongate, lanceolate, rondelle, saddle, bilobate, serrated, clumpy, flat, bulliform, prism, vertebrate, conduit, bow type, and special types. The phytolith assemblages mainly consist of elongate and lanceolate types, while short celled phytolith types were scarce. A comparison of the topsoil phytolith assemblages in the relatively warm humid, warm dry, cold humid and cold dry zones of the study area, which revealed that the higher content of elongate types in cold zone, while the contents of bulliform type, flat type and saddle types were higher in warm zone. The lanceolate type, clumpy type and serrated type were dominant in the wet zone, warm wet zone and cold wet zone, respectively. This indicated that the topsoil phytolith assemblages in Bashang area were sensitive to the annual temperature and precipitation. This case study could be used as a baseline for interpreting fossil phytolith assemblages for palaeovegetation and palaeoclimate reconstruction in the Bashang area.