Taking the three inefficient protection forest of Pure cypress forest central Sichuan hill area, Pure pine forest and Mixed pine-cypress forest as research objects,using experiment of open window,the four broad-leaf species,Robinia pseudoacaciac.l Zhaiguan、Alnus formosana、Cinnamomum japonicum and Cinnamomum camphora were planted.By using three factors:different type of fertilizer(compound fertilizer-A1, nitrogenous fertilizer-A2,decaying cake fertilizer-A3),different fertilizing method(hole fertilization-B1...