[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.
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
Si-Zhong
SZ
Yang
Hui-Jun
HJ
Jin
Xi
X
Wen
Dong-Liang
DL
Luo
Shao-Peng
SP
Yu
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