基于有壳变形虫的大兴安岭泥炭地水位定量重建

发布时间：2018-03-21 02:37

本文选题：泥炭地　切入点：水位重建　出处：《东北师范大学》2015年硕士论文　论文类型：学位论文

【摘要】：泥炭沼泽古水位是以泥炭作为信息载体研究古环境的重要参数,但关于泥炭地古水位的定量研究近年才兴起。大兴安岭是我国贫营养型泥炭地主要分布区,对环境变化敏感,适合研究古水位的变化。在贫营养型泥炭地中,有壳变形虫对湿度反应迅速,这个特性使其成为古水位变化常用的生物代用指标。基于现有研究基础,我们应用中国东北地区泥炭地有壳变形虫——水位转换函数模型定量重建了大兴安岭三个泥炭剖面的古水位,并将重建结果与气象数据进行相关性分析,验证有壳变形虫指标的适用性。本次研究样品经镜下鉴定后共鉴定出有壳变形虫48种,其中出现了我国从未报道过的新纪录种Archerella flavum和新纪录属Placocista(包括Placocista spinosa和Placocista glabra两个种)。我们对三个泥炭剖面的有壳变形虫物种组成做了剖面图谱分析,应用转换函数定量重建了三个剖面的古水位。LGH、MG、PG三个泥炭剖面的古水位重建结果具有相关性,证明了有壳变形虫——水位转换函数模型在本区的适用性。三个剖面古水位重建结果有一定的差异,这也从另外一个方面证实有壳变形虫对水位变化非常敏感。本区水位埋深重建结果的的总体趋势是逐步增大,生境由湿变干。利用LGH泥炭剖面重建出的水位——年代曲线与气象数据(年均温、夏均温、年降水、夏降水)进行相关性分析,结果表明夏季均温可能是本区水位变化的主要气候驱动因子。
[Abstract]:The paleolevel of peat swamp is an important parameter to study paleoenvironment with peat as information carrier, but the quantitative study on paleowater level of peat land has only risen in recent years. Daxinganling is the main distribution area of poor and nutritious peat land in China, and is sensitive to environmental change. It is suitable for studying the variation of paleowater level. In the poor nutritious peat land, the shell amoeba has a rapid response to humidity, which makes it a commonly used biological substitute index for paleowater level change. The paleowater level of three peat sections in Daxing'an Mountains has been quantitatively reconstructed by using the model of conversion function between crustal amoeba and water level in peat land in northeast China, and the correlation between the reconstruction results and meteorological data has been analyzed. To verify the applicability of the index of the shell amoeba, 48 species of the shell amoeba were identified by microscopic identification in this study. Among them, new record species Archerella flavum and new record genus Placocista (including Placocista spinosa and Placocista glabra), which have never been reported in China, have been found. The reconstruction results of paleowater level. LGHMGGG PG of three sections of three sections were correlated with the transformation function. The applicability of the conversion function model of the crustal amoeba-water level in this area is proved. The results of paleowater level reconstruction in the three sections are different to some extent. This also proves that the crustal amoeba is very sensitive to the change of water level in another way. The general trend of the result of water level reconstruction in this area is gradually increasing. The habitat was dried by humidity. The correlation analysis was carried out with meteorological data (average annual temperature, summer mean temperature, annual precipitation and summer precipitation), which were reconstructed by LGH peat profile. The results show that the mean temperature in summer may be the main climatic driving factor of water level change in this area.
【学位授予单位】：东北师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P531

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