伊图里河冰楔温度变化与微生物数量的相关性初探  

Relationships between temperature change and microbial amount in inactive ice wedges in Yitulihe,Northeast China

作　　者：杨思忠[1] 金会军[1] 文茜[2] 罗栋梁[1] 于少鹏[3] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,兰州730000 [2]西北民族大学电气工程学院,兰州730124 [3]哈尔滨学院地理系,哈尔滨150086

出　　处：《应用生态学报》2009年第11期2785-2789,共5页Chinese Journal of Applied Ecology

基　　金：冰冻圈科学国家重点实验室开放基金项目(SKLCS07-04);冻土工程国家重点实验室青年博士基金项目(SKLFSE-ZQ-04)资助.

摘　　要：冰楔是反映多年冻土区古气候(温度)变化的标志物,冰楔不同叶理的稳定氧同位素(δ18O)浓度可反映冰楔发育过程中的古温度变化过程.20世纪80年代末,在伊图里河地区发现了不活动冰楔,这是迄今北半球发现纬度最南的冰楔,它具有重要的气候和环境意义.采用稳定同位素分析、荧光显微计数和流式细胞术,对伊图里河冰楔δ18O浓度与微生物数量进行了分析.结果表明:伊图里河冰楔发育过程中有3次小周期的气温波动,不同叶理的微生物数量也出现了3次波动.温度变化与微生物数量之间的相关性分析表明,冰楔叶理的成冰温度降低,冰楔中存活的微生物数量也随之降低,且温度越低,微生物数量越少.Ice-wedge is an indicator of paleoclimate change. The δ18Oconcentration in different layers could reflect the change of paleotemperature during ice-wedge growth. In the late 1980s, inactive ice wedges were found in Yitulihe, Northeast China, which were the south-most ones so far and were important in climatic and environmental research. In this paper, the δ18O concentration and microbial number in the inactive ice-wedges were analyzed by using stable isotope, fluorescence microscopy counting, and flow cytometer （FCM）. During the ice-wedge growth in Yitulihe area, there were three short-term paleotemperature fluctuation, and three times of fluctuation in microbial amount in different ice-wedge layer. Correlation analysis indicated that there was a converging relationship between the temperature change and microbial amount in the ice-wedges. The lower the temperature when ice-wedge layer formed, the less the microbes survived in the layer.

关 键 词：冰楔 古温度 Δ18O 微生物 伊图里河 

分 类 号：Q938[生物学—微生物学]