Abstract:Experiments were carried out to study induced chemical change in the pine needles damaged to different degrees with time and in space after partial plant damage.The contents of secondary metabolites (Tannins and phenolics) in damaged pine constantly fluctuaed with time,which increased at first and descended later,then returned to normal.In turn,the content of soluble sugar decreased at first and then returned to normal.Also,the degree of damage effected on the induced chemical change. The more secondary m...