[Relationships between temperature change and microbial amount in inactive ice wedges in Yitulihe, Northeast China].
Ice-wedge is an indicator of paleoclimate change. The delta18 O concentration 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 delta18 O 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.
Yang
Si-Zhong
SZ
State Key Laboratory of Frozen Soils Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China. yangsz@lzb.ac.cn
Jin
Hui-Jun
HJ
Wen
Xi
X
Luo
Dong-Liang
DL
Yu
Shao-Peng
SP
D002681:China; D057231:Climate Change / Q000706:statistics & numerical data*; D003080:Cold Temperature; D015169:Colony Count, Microbial; D046448:Ice Cover / Q000382:microbiology*; D010103:Oxygen Isotopes
D010103:Oxygen Isotopes