呼伦湖表层沉积物花粉空间分布特征及影响因素探讨  被引量:3

Spatial Distribution Characteristics and Environmental Influencing Factors of Pollen Assemblage of Lake Surface Sediments from Lake Hulun

在线阅读下载全文

作  者:刘立娜[1,2] 王维[1,2] 马玉贞[3] 李岩岩[1,2] 姜雅娟[1,2] 何江[1,2] 

机构地区:[1]内蒙古大学环境与资源学院,呼和浩特010021 [2]内蒙古大学环境地质研究所,呼和浩特010021 [3]北京师范大学环境演变与自然灾害教育部重点实验室、地表过程与资源生态国家重点实验室,北京100875

出  处:《沉积学报》2015年第4期744-753,共10页Acta Sedimentologica Sinica

基  金:国家自然科学基金(批准号:41162004,41271207,41330748);内蒙古教育厅高等学校青年科技英才计划(编号:NJYT-14-A01)联合资助

摘  要:对呼伦湖29个表层沉积物花粉组合和环境影响因子进行主成分分析(PCA)和冗余分析(RDA),探讨呼伦湖表层沉积物花粉组合的空间分布特征及造成空间分异的现代过程机制。研究结果表明,呼伦湖表层沉积物花粉组合空间分布差异显著,藜科和松属等花粉在湖泊东侧近岸地带百分含量较高,蒿属与桦属花粉在湖泊中部和西部百分含量较高。呼伦湖东岸盐生非地带性植被、主导风向形成的漂流、与水深相关的二次悬移再沉积过程以及河流搬运作用是影响呼伦湖表层沉积物花粉空间分异的主要因素,其中湖泊东岸盐生非地带性植被造成了藜科花粉百分含量在近东岸地带偏高,主导风向形成的由西向东的漂流作用可能导致了松属花粉百分含量在近东岸地带偏高。The spatial characteristics of pollen assemblages of the lake surface sediments and associated dynamics on deposition, perseveration and transport process is important to the paleoclimate and paleoenvironment reconstruction. Lake Hulun, which is situated in the northeast of China, with a lake surface area of -2 100 km^2 and an average water depth of 3 m, and four inflow rivers in the north, east and the south, provide an ideal site for such researches. In ad- dition, the widely varied lake basin (the differences of the water depth between each sample site) and the changed vegetation pattern around the lake, provide chances to explore the impact of the resuspension and redeposition process, the influencing of drift and the influence of non-zonal vegetation to the pollen assemblage in the lake. Investi- gations on pollen assemblages of 29 surface sediment samples throughout Lake Hulun were carried and ordination anal- ysis on the pollen percentage data and environmental data were conducted to disclose the spatial characteristics of pol- len assemblages and the potential dynamics between the pollen data and the environmental factors. Specifically, 29 lake surface sediment samples (top 2 cm sediment) were collected at a spatial interval of 5×5 minutes along a snake line in the lake and three types of environmental impact factors including water depth ( in relation to resuspension and redeposition), the distance to the rivers mouth ( in relation to river transportation process) and the distance to the east coast of the lake ( in relation to the drift caused by dominant wind in warm season and the influence of the non-zonal vegetation in the east of the lake ) were constructed. Ordination analysis including principal component analysis (PCA) and redundancy analysis (RDA) were selected according to the data type of the pollen data (i.e., liner mod- el as indicated by the gradient length of the detrended correspondence analysis, DCA) and were conducted on the pol- len data and environment

关 键 词:呼伦湖 表层沉积物 花粉空间分布 环境影响因子 排序分析 

分 类 号:Q913.84[天文地球—古生物学与地层学]

 

参考文献:

正在载入数据...

 

二级参考文献:

正在载入数据...

 

耦合文献:

正在载入数据...

 

引证文献:

正在载入数据...

 

二级引证文献:

正在载入数据...

 

同被引文献:

正在载入数据...

 

相关期刊文献:

正在载入数据...

相关的主题
相关的作者对象
相关的机构对象