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Vegetation-Sensing Properties of Pollen and Plant Macrofossil Assembleges: Effect of Lake Size, Pollen Dispersal, and Vegetation Pattern

花粉和植物化石组合的植被感知特性：湖泊大小、花粉传播和植被格局的影响

基本信息

批准号：
8906486
负责人：
Thompson Webb III
金额：
$ 18.01万
依托单位：
Brown University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1989
资助国家：
美国
起止时间：
1989-08-01 至 1992-01-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8906486&HistoricalAwards=false
关键词：
Vegetation Sensing Properties Pollen Plant

项目摘要

The objective of this research is to understand the vegetation-sensing properties of pollen and plant macrofossil data, which are the primary sources of information on past vegetation. Of specific concern will be the documentation of effective pollen source areas for important tree taxa in the northeastern United States and understanding the factors that affect them. Understanding of these factors, which include lake size, pollen dispersal properties, and vegetation patterns, is crucial to the design and interpretation of paleoecological studies, because pollen source area determines the spatial scale at which vegetation is recorded by fossil pollen data. Understanding of how plant macrofossils record vegetation composition is also important because macrofossils represent the absolute limits to spatial resolution attainable from paleoecological data. Modern pollen assemblages will be studied from 20 small lakes (2 ha) and 40 medium-sized lakes (5-30 ha) in addition to data from 19 small lakes which have been studied previously. Pollen percentages will be compared with tree abundances within different radial distances (20 m to 30 km) surrounding the lakes. Scatter plots and regression analyses will be used to identify pollen source areas and test models of pollen dispersal and representation. Modern macrofossil assembleges from the small lakes will be compared with forest composition within 20 m of the lakes using similar methods.

本研究的目的是了解花粉和植物化石的植被敏感特性数据，这是过去的信息的主要来源植被特别令人关切的是，有效花粉源区的重要树木类群在美国东北部，了解影响他们。了解这些因素，其中包括湖泊大小，花粉传播特性和植被模式，对古生态学的设计和解释至关重要研究，因为花粉源区决定了空间尺度在那里植被被花粉化石记录下来。了解植物宏化石如何记录植被组成也很重要，因为宏体化石代表了空间分辨率的绝对极限古生态数据现代花粉组合将被研究 20个小型湖泊（2公顷）和40个中型湖泊（5-30公顷）除了已经研究过的19个小湖泊的数据外，以前。花粉百分比将与树进行比较不同径向距离（20米至30公里）内的丰度环绕着湖泊。散点图和回归分析将用于确定花粉来源地区和测试模型，花粉的传播和表现。现代大型化石来自小湖的湖水将与森林相比较在20米范围内的湖泊组成使用类似的方法。