To find out the relationship between the zonal distribution of Bothriochloa ischaemum population and the Hydrothermal gradient,the effects of the hydrothermal gradient on the zonal and ecological amplitude of Bothriochloa ischaemum population in the semi-arid and semi-humid region of Loess Plateau with field survey and position monitoring were studied from 2005 to 2009.The elevation gradient affected Bothriochloa ischaemum extend from its optimal vertical elevation of 500 m-1700 m above sea level to 1950 m ...
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