Abstract: Chinese Journal of Ecology,1993,12(6)：25-28.Incense tobaco was intercropped with 1-2yr.fir plantation.The benefits were analyzed.The intercrop-ping system improved space and light energy utilization,fir seedling growth,soil-water protection and the occurrence of disease and pest.Apparent economic benefit was got.525kg, ha^-1 of tobaco was har-vested and 1200 yuan.ha^-1 of tobaco was harvested and 1200 yuan.ha^-1,pure benefit was got. It is 1.4-4.2 times higher than intercropped grain. The quality of tobaco was higher than pure tobaco crop. The total K^-1,total saccharides and reducing sugar content were 29.4,12.4 and 11.29% higher than that of pure crop.The total N and protein content were 18. 6,and 15.2% lower.

Key words: intercropping, soil, microbial community, Biolog.