College of Che-mistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, Zhejiang, China.
State Key Laboratory of Vegetation and Environmental Changes, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.
Ying Yong Sheng Tai Xue Bao. 2021 Feb;32(2):441-452. doi: 10.13287/j.1001-9332.202102.005.
Establishing a precise relationship between modern vegetation and surface pollen is the basis and key to quantitatively reconstruct paleovegetation and paleoclimate based on pollen records. The record of plant community plots has been less considered in the statistical analysis of modern vegetation and surface pollen, which limits the quantitative estimation of its precise relationship. In this study, the quantitative relationships of compositions and quantities between modern surface pollen and plant community were analyzed, based on the Bray-Curtis dissimilarity, through the analysis of 33 surface soil samples and corresponding vegetation plots from forest, meadow steppe, typical steppe and desert steppe on the Northeast China Transect. Results showed that, in a single plot, the relationships between vegetation and pollen in compositions and quantities were different across all families and genera, dominant and common families and genera, and less common and rare families and genera, respectively, due to the differences in pollen dispersal and pollen productivity. There were significant differences among different vegetation types. The compositions of meadow steppe differed greatly, while all families and genera, dominant and common families and genera differed greatly in the quantitative relationship in forest. Less common and rare families and genera differed greatly in the compositions in meadow steppe. The vegetation-pollen relationship of different families and genera was basically the same in terms of composition and quantities. According to the Bray-Curtis dissimilarity, pollen taxa could be divided into three types: over-representative, under-representative and representative types. This dissimilarity index represented both the species composition and quantity relationship between vegetation and pollen both at quadrat scale and at specie level, which could be used as an indicator to quantitatively describe the modern vegetation-pollen relationship.
建立现代植被与地表花粉之间的精确关系是基于花粉记录定量重建古植被和古气候的基础和关键。在现代植被和地表花粉的统计分析中，植物群落样方的记录较少被考虑，这限制了其精确关系的定量估计。本研究基于 Bray-Curtis 不相似性，通过对东北样带森林、草甸草原、典型草原和荒漠草原 33 个表层土壤样品及其对应的植被样方的分析，定量研究了现代地表花粉与植物群落组成和数量之间的关系。结果表明，在单个样方中，由于花粉传播和花粉生产力的差异，植被与花粉在组成和数量上的关系在所有科属、优势科属和常见科属以及较少见和罕见科属之间存在差异。不同植被类型之间存在显著差异。草甸草原的组成差异很大，而森林的组成和数量关系在所有科属、优势科属和常见科属中差异很大。在草甸草原中，较少见和罕见科属的组成差异很大。不同科属的植被-花粉关系在组成和数量上基本相同。根据 Bray-Curtis 不相似性，花粉类群可以分为三种类型：代表性过高、代表性过低和代表性类型。该不相似性指数既代表了植被和花粉之间的物种组成关系，也代表了种级水平上的数量关系，可作为定量描述现代植被-花粉关系的指标。
