华山松&响叶杨（6∶4）混交林林地土壤有机质、速效磷、速效钾、pH值比华山松纯林林地分别大15.99%、10.84%、7.69%、12.5%，提高了土壤的肥力。
The organic matter , the available P , the available K , pH of mixed forest ( 6 ∶ 4 ) were 15.99 % , 10.84 % , 7.69 % , 12.5 % more than those of P.armandi pure forest , and improved the soil fertility .
响叶杨