川中丘陵区低效防护林"开窗补阔"改造模式对不同施肥措施的响应

以柏木纯林、马尾松纯林、松柏混交林 3 种川中丘陵区典型低效防护林为研究对象,对其进行开窗补阔改造,分别种植窄冠刺槐(Robinia pseudoacacia Zhaiguan)、台湾桤木(Alnus formosana)、天竺桂(Cinnamomum japonicum)和香樟(Cinnamomum camphora...

Responses of "Opening Window and Supplementing Broad-leaved Tree" Revamping Patterns of Three Kinds of Inefficient Protection Forest in Hilly Areas of Central Sichuan to the Different Fertilizer Practice

Taking the three kinds of inefficient protection forest of pure cypress forest,pure pine forest and mixed pine-cypress forest in hilly area of central Sichuan as research objects,the experiment of open window was done and the four broad-leaf species,Robinia pseudoacacia,Alnus formosana,Cinnamomum japonicum and Cinnamomum camphora,were planted.By using three factors： different types of fertilizer（compound fertilizer-A1,nitrogenous fertilizer-A2,decaying cake fertilizer-A3）,different fertilizing methods（hole fertilization-B1,radial canal-B2,control treatment-B3） and different number of fertilizer（50 g-C1,100 g-C2,150 g-C3）,the broad-leaf species（L9（34）） were fertilized with manurs by orthogonal test and then a survey was made of their growth of tree height and ground diameter after a year.The results showed that：（1）To four broad-leaf species,the annual average of tree height growth of Cinnamomum camphora was the biggest among them,which was more 52%,77% and 75% than Robinia pseudoacacia,Alnus formosana,Cinnamomum japonicum,while the annual average growth of its ground diameter was more 44%,74% and 56%.（2） The growth of the four broad-leaf species in the mixed pine-cypress forest was the best among the three different transformation patterns,the next was pure pine forest,the last was pure cypress forest.The annual average growth of tree height was mixed pine-cypress forest（0.83 m）pure pine fores（0.71 m） pure cypress forest（0.32 m）,while the ground diameter was mixed pine-cypress forest（0.90 cm）pure cypress forest（0.83 cm） pure pine fores（0.82 cm）.（3）The optimal combination of every factor level was A1B1C3,the next was A1B1C1.The influence to both the growth of tree height and ground diameter of every factor level was A→C→B.（4）Not only using different active carbon but also using different kinds of fertilizer had a remarkable impact upon the growth of trees,while using different combinations of fertilizations had not obvious influence.