阳宗海现代介形类的组合及分布

发布时间：2018-03-25 00:33

本文选题：阳宗海　切入点：介形类　出处：《云南师范大学》2015年硕士论文

【摘要】：介形类在湖泊沉积环境研究中作为有效指标起的作用非常重要。然而由于对一些区域性或地方性属种的生活环境的不太熟知,以及对一些能够忍受周遭环境发生很大范围变化的广适种的不了解,使得利用介形类的分布与组合还原其环境信息的工作很难完成。本文针对这一缺陷,在云南省九大高原湖泊之一的阳宗海中共采集了不同深度的28个表层沉积物样品并对其进行处理鉴定及定性、定量分析,对发现的所有介形类的生理特征与生态资料进行了详细地描述。发现这些表层沉积物中的介形类存在丰度和分异度的变化。一、统计到化石介形类壳瓣数共1724个,共鉴定出介形类6属7种。分别为非调和异星介Heterocypris incongruens,似斜网纹浪花介Parachinocythere reticulata gen.et sp.nov.,黑纹斗星介Cypridopsis nigrovittata,金河星介Potamocypris smaragdina,抚仙湖新纹星介Neovirgatocypris fuxianhuensis Huang et Yang sp.nov.,抚仙湖玻璃介Candona fuxianhuensis,玻璃介(未定种)Candona sp.。二、研究结果显示Heterocypris incongruens为阳宗海内第一大绝对优势种,其百分含量约为66.7%;Parachinocythere reticulata gen.et sp.nov.为阳宗海内第二大优势种,其百分含量约为15.1%;Cypridopsis nigrovittata为阳宗海内第三大优势种,其百分含量约为6.9%。三、介形类较高生产量分布在西南边湖盆以及西北角湖湾里。整个湖泊西南部的介形类生产量比东北部的介形类生产量明显要多,在整个湖泊偏西北部终端介形类壳瓣数量达到最低值。至于在最北边的样品YZH-28中我们未发现任何介形类。四、结合阳宗海水体的温度、深度、pH值和含氧量等相关水质数据,将其划分为浅、亚深、深三个组合水相。浅水相的介形类整体表现出Heterocypris incongruens—Cypridopsis nigrovittata的组合形式,共发现介形类壳瓣数599个。亚深水相的介形类整体表现出Heterocypris incongruens—Parachinocythere reticulata gen.et sp.nov.的分布情况,共发现介形类壳瓣数503个。深水相的介形类以Parachinocythere reticulata gen.et sp.nov.为主,共发现介形类壳瓣数632个。五、2008年阳宗海湖水发生了严重的砷污染事件。虽然2009年云南省政府开始对阳宗海进行人工治理,污染事件渐渐恢复平静,但湖水水位下降严重,砷污染还是没有根治彻底。因此本文推断阳宗海介形类的组合特征和分布规律有可能与砷的形态组成和空间分布有一定的联系,也对此进行了相关的探讨。六、本文共对非调和异星介Heterocypris incongruens,黑纹斗星介Cypridopsis nigrovittata,玻璃介(未定种)Candona sp.3种介形类的软体部位进行了研究,获得了对应介形类的软体特点和所在的生态环境情况。使云南高原区域的现代介形类生态资料更加的丰富,为之后用介形类这种替换指标在古环境古气候的恢复工作中,提升云南高原区域地球科学的研究等工作起铺垫作用。
[Abstract]:The role of ostracods as an effective indicator in the study of lacustrine sedimentary environment is very important. However, due to the lack of knowledge of the living environment of some regional or local genera and species, And the lack of understanding of some widely suitable species that can tolerate a large range of changes in the surrounding environment makes it difficult to restore their environmental information by using the distribution and combination of ostracods. A total of 28 surface sediment samples of different depths were collected in Yangzonghai, one of the nine major plateau lakes in Yunnan Province, and processed, identified, qualitatively and quantitatively analyzed. The physiological characteristics and ecological data of all the ostracods found were described in detail. It was found that the ostracods in these surface sediments varied in abundance and differentiation. First, the total number of shell lobes of fossil ostracods was 1724. A total of 6 genera and 7 species of ostracoda have been identified. They are Heterocypris incongruens, Parachinocythere reticulata gen.et sp. Nov., Cypridopsis nigrovittata, Potamocypris smaragdina, Neovirgatocypris fuxianhuensis Huang et Yang sp. Nov., Candona fuxianhuensis, Candona fuxianhuensis, et al. Candona sp. II. The results showed that Heterocypris incongruens was the largest absolute dominant species in Yangzong sea, and its percentage content was about 66.7%. It was the second dominant species in Yangzong sea, and its percentage content was about 15.1kudsis nigrovittata was the third dominant species in Yangzong sea, and its content was about 6.90.3. The higher production of ostracods is distributed in the southwest lake basin and the lake bay in the northwest corner. The total production of ostracods in the southwest of the lake is obviously higher than that in the northeast. As for the northernmost sample YZH-28, we have not found any ostracods. (4) considering the temperature, depth pH and oxygen content of Yangzong seawater, The ostracods of shallow water phase show the combined form of Heterocypris incongruens-Cypridopsis nigrovittata, and the total number of ostracoid shell lobes is 599. The whole ostracod of subdeepwater phase shows the distribution of Heterocypris incongruens-Parachinocythere reticulata gen.et sp. Nov. A total of 503 ostracoid shells were found. The ostracods of deep water phase are mainly Parachinocythere reticulata gen.et sp. Nov. A total of 632 ostracoid shells were found. Fifth, serious arsenic pollution occurred in Yangzonghai Lake water in 2008. Although the Yunnan Provincial Government began artificial treatment of Yangzonghai in 2009, the pollution incident gradually returned to calm, but the water level of the lake dropped seriously. Arsenic pollution is still not completely cured. Therefore, this paper inferred that the combination characteristics and distribution law of the yangzonghai ostracoda may have some relation with the form composition and spatial distribution of arsenic, and also carried on the related discussion to this. In this paper, the soft parts of Heterocypris incongruens, Cypridopsis nigrovittata, glass ostracods (Candona sp.3) are studied. The software characteristics of the corresponding ostracods and their ecological environment are obtained, which enrich the modern ostracal ecological data in Yunnan Plateau, so that the replacement index of ostracods can be used in the restoration of paleoclimate and paleoclimate. To promote the study of Yunnan Plateau regional geoscience and other work play a role in paving the way.
【学位授予单位】：云南师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：Q915

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