作 者：
夏璎凡;介冬梅;李德晖;周沛芳;宋丽娜;蒙萌;蒋雪纯
单 位：
东北师范大学地理科学学院;国家环境保护湿地生态与植被恢复重点实验室;东北师范大学草地研究所植被生态科学教育部重点实验室
关键词：
植硅体;森林区;草原区;草本植物;东北地区
摘 要：
明确植物群落植硅体组合之间的差异,是进行区域古植被、古气候恢复工作的必要前提。对东北地区森林区和草原区内26个草本植物群落内的植物植硅体进行了分析,从组合类型和相同类型植硅体数量两个方面对森林区和草原区的草本植物群落植硅体进行了详尽对比。根据森林区与草原区草本植物植硅体的形态特征,进行定性分析,将植硅体类型分为15种,包括鞍型、齿型、帽型、哑铃型、棒型、毛发状、尖型、硅质突起、块状、扇型、边缘弯曲扁平状、硅化气孔、硅化导管、"表面硅质突起的球型"、"絮状长条型"植硅体;并从方差分析和聚类分析两个角度对草本植物群落相同类型植硅体的数量进行定量分析。研究发现,森林区与草原区可产生部分相同类型植硅体,但边缘弯曲扁平状等植硅体仅见于森林区,十字型植硅体仅见于草原区。此外,森林区与草原区相同类型植硅体的数量也存在差别。通过对26个群落的植硅体组合进行单因素方差分析,发现硅化导管等植硅体的平均百分含量在森林区和草原区相差不多,但硅质突起和硅化组织的平均百分含量在森林区和草原区有显著差异,短细胞植硅体有极显著差异。通过对26个群落植硅体组合进行聚类分析,发现森林区和草原区各自内部的群落具有一定相似性,但两区彼此之间存在一定差异性。根据Ic指数所指示的环境意义,森林区草本植物群落生境有较草原区草本植物群落更为寒冷的特征。值得注意的是,研究中还在森林区发现了与前人工作中描述不同的表面带有硅质突起的球型植硅体,还见到了尚未在文献中发现的"絮状长条型"植硅体。
译 名：
Comparison of phytolith assemblages in the herbaceous communities of forest and grassland regions in Northeast China
作 者：
XIA Ying-fan;JIE Dong-mei;LI De-hui;ZHOU Pei-fang;SONG Li-na;MENG Meng;JIANG Xue-chun;School of Geographical Science,Northeast Normal University;State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration;Institude of Grassland Science,Northeast Normal University,Key Laboratory for Vegetation Ecology,Ministry of Education;
关键词：
phytolith;;forest region;;grassland region;;herbaceous plant;;Northeast China
摘 要：
In order to investigate variations in the phytolith assemblages of different plant communities,the authors have analyzed the characteristics of 26 herbaceous communities from forest and grassland regions in Northeast China. A detailed comparison has been made of two aspects,phytolith morphology and the quantities of the various phytolith types found in the two regions' herbaceous communities. Qualitative analysis of morphological characteristics revealed 15 phytolith species: saddle,trapeziform,rondel,bilobate,elongate,hair,lanceolate,papillate,parallepipedal bulliform cell,cuneiform bulliform cell,tabular stellate,silicified stomata,silicified vascular,globular papillate and oblong reticulate. Quantitative analysis of phytolith type distributions was carried out using variance and cluster analyses. Results showed that the forest and grassland regions can produce the same types but that some,such as tabular stellate,were found only in forest regions while others,such as cross,were found only in grasslands. There were also some differences in the quantity of phytolith types present in the two regions' herbaceous communities. One-way ANOVA was done with data on the 26 phytolith assemblages and found that the average percentage of phytolith such as silicified vascular showed no significant differences between forest and grassland regions,while papillate and silicified tissue types showed disparities. Moreover,the percentage of short cell phytolith showed highly significant differences. Based on the results of cluster analysis,herbaceous phytolith assemblages from forest and grassland non-understory were often similar while understory assemblages in the two regions were different. Icindex scores indicated that the habitats of herbaceous communities in forest regions were colder than those of grasslands. It is worth noting that the globular papillate type described in previous work was also found in this study,while the oblong reticulate type reported here has not been described in previously published literature.
