MODERN PHYTOLITH ASSEMBLAGES FROM THE NORTH-AMERICAN GREAT-PLAINS
MODERN PHYTOLITH ASSEMBLAGES FROM THE NORTH-AMERICAN GREAT-PLAINS
复制标题
DOI：
10.2307/2845533
复制
发表时间：
1994-05-01
影响因子：
3.9
通讯作者：
TIESZEN, LT
中科院分区：
文献类型：
--
作者：
FREDLUND, GG;TIESZEN, LT
对五十种现代植硅体组合的分析证明了蛋白石植硅体分析作为北美大平原花粉分析替代品的实用性。研究中使用的十五个原生草原地点跨越了北美中部草原的东西向湿度和南北温度梯度。对每个草原地点分析的多个土壤样本测量了地点内的变异性，并提供了组合形成方式的证据。土壤组合强烈反映了区域草地组成，而不是当地植被。有五个因素有助于组合的形成：就地腐烂、火灾、风成运输、食草和河流/崩积物沉积。土壤组合应被解释为这些过程长期整合的最终结果。组合与受景观位置（例如高地与低地）控制的当地条件的对应关系不如区域对应关系重要，但可以检测和预测。这里提供的数据将为解释北美大平原第四纪晚期古土壤的化石组合提供基础。
The analysis of fifty modern phytolith assemblages demonstrates the practicality of opal-phytolith analysis as a surrogate for pollen analysis in the North American Great Plains. The fifteen native grassland sites used in the study span both the east-west moisture and north-south temperature gradients of the central North American grasslands. Multiple soil samples analysed from each grassland site measure within-site variability and provide evidence of how assemblages are formed. Soil assemblages strongly reflect regional grassland composition rather than local vegetation. Five factors contribute to assemblage formation: decay-in-place, fire, eolian transport, herbivory and fluvial/colluvial deposition. Soil assemblages should be interpreted as the end result of these processes integrated over long time periods. The correspondence of assemblages to local conditions controlled by landscape position (e.g. upland v. lowland) is less important than the regional correspondence but is detectable and predictable. Data presented here will provide a basis for interpretation of fossil assemblages from late Quaternary paleosols in the North American Great Plains.