第四纪湖相介形类组合的古气候与古环境意义:以洞庭盆地介形类现生种为例

Paleoclimatic and Paleoenvironmental Implications of the Quaternary Lacustrine Ostracod Assemblages: an Example of the Recent Ostracod from the Dongting Basin,Central China

本文在分析国内外第四纪湖相介形类组合古气候与古环境意义研究现状基础上,初步研究了洞庭湖湘阴近岸介形类现生种分布与生态特征.国外在第四纪湖相介形类古气候与古环境研究方面做了大量工作,取得了丰富成果.而国内该方面工作仅主要集中青藏高原及其邻区,其它地区鲜见.国外在详细介形类现生种生态调查基础上,建立基于其的环境参数转换函数,并在第四纪古气候与古环境定量重建中发挥了重要作用.然而我国现生种生态调查依然薄弱,主要表现在1)仅主要集中青藏高原等少数地区,其它地区还很少;2)生境数据绝大多为定性或半定量,很少定量;3)很少按季节采样.洞庭湖湘阴近岸包含3个属种,分别为未定种、Metacypris bellareticulata及Darwinula sp.,它们的生态要求为电导率240μs/cm,溶氧量10.45 mg/L,p H值8.1,水深0.5-1 m,水温10℃.

A preliminary study of the characteristics of distribution and ecology of the re- cent ostracod from the nearshore of the Dongting Lake, in Xiangyin, Hunan, was conducted based on the research status of the paleoclimatie and paleoenvironmental implications of the Quaternary lacustrine ostracod assemblages in the world. A number of studies on paleo- climate and paleoenvironment of the Quaternary lacustrine ostraeod have been performed by oversea scholars, and have obtained rich achievements, while the corresponding research in China has been limited mainly in Qinghai-Tibetan Plateau and its adjacent region, very rare in other area. The establishing of the ostracod-based transition function for environ- mental parameters by foreign authors, based on the detailed ecological investigations of the recent ostracod, has played an important role in quantitative reconstructions of Quaternary paleoelimate and paleoenvironment, yet, the corresponding investigations in China are still weak, the main representations including ： 1 ） distribute principally in Qinghai-Tibetan Plat- eau and a few other places, sparse elsewhere ;2）most data of the habitat for the recent os- tracod are qualitative or semiquantitative, the rest are quantitative ;3 ）rare seasonality sam- piing. Three ostracod species were found in this study, the unknown species, Metacypris bellareticulata and Darwinula sp. , respectively, their habitat variables were electroconductihility of 240 μs/cm, dissolving oxygen amount of 10.45 mg/L, pH value of 8. 1, water depth of 0. 5-1 m and water temperature of 10℃.