[1] 1.Catt J. A.,1988,Quaternary Geology For Scientists And Engineers. Ellis Horwood Limited, New York. Chichester.Brisbane. Toronto, 27.

2.李春园、王先彬、文启彬、邵波,1995,黄土沉积物中碳酸盐的碳、氧同位紊组成特征与古气候,中国科学((B辑).(3):318 一323。

3.Duchscherer Wm. Jr.,1982.Geochemical exploration for hydrocarbons一no new trick一but an old dog, Oil and Gas Journal. Julys. 163一176.

4.申歧祥、王先彬,1990,土城CO2和次生碳酸盐的碳同位素地球化学特征,环境地球化学与健康,贵州科技出版社,190一193。

5.Parada C. B.,Long A. and Iavis S. N.,1983,Stable一isotopic composition of soil carbon dioxide in the Tucon basin. Ariwna, U. S. A.,Isot. Geosei.,1:219一236.

6.Rightmire C. T. , 1978, Seasonal variation in Pcoz and δ13C content of soil atmosphere, Water Resour. Res. , 14: 691一692.

7.Keeling C. D.1958,The concentration and isotopic abundance of atmospheric carbon dioxide in rural areas, Geochim. Cosmochim.Acta, 13:322一334.

8.张柳明、徐永昌,1992,中国西北地区大气CO2浓度及其碳、氧同位紊组成特征,科学通报,(5):441-444。

9.Bradley R. S.,1985,Quaternary Paleoclimatology. Allen & Unurin Inc. London. 164.