2种造林模式下板栗前期生长量的对比研究

目的]为广西省东兰县板栗的经营管理提供理论依据。方法]以广西省东兰县退耕还林地4种立地条件中2种造林模式（板栗纯林、板栗×喜树混交林）下的板栗为研究对象，采用典型抽样和样点调查的方法，研究2种造林模式下板栗前期地径、树高和冠幅的生长量，并与荒山林地板栗成林的生长量进行对比。结果]2种造林模式下，板栗的经营状况基本一致；纯林中板栗地径、树高和冠幅的年平均生长量分别为1.288 cm、0.644 m、0.594 m，混交林中板栗地径、树高和冠幅的年平均生长量分别为1.125 cm、0.585 m、0.572 m，板栗成林地径、树高和冠幅的年平均生长量分别为1.224 cm、0.608 m、0.581 m。结论]纯林中板栗生长状况较好，应加强对混交林中板栗的前期管理（如多施有机肥等）。

Comparative Study on Growt of Castanea mollissima at Early Stage under 2 Kinds of Afforestation Modes

Objective] The aim was to provide the theoretical basis for the management of Castanea mollissima in Donglan County of Guangxi Province.Method] With the Castanea mollissimas in 2 kinds of afforestation modes(Castanea mollissima pure forest,mixed forest of Castanea mollissima and Camptotheca acuminata Decne.) in 4 kinds of site conditions of the forest land returned from the cultivated land in Dondlan county of Guangxi Province as the tested object,the methods of typical sampling and site investigation were taken to study the growth of ground diameter,plant height and crown width of Castanea mollissima at early stage in 2 kinds of afforestation modes,and their growth was compared with those of mature Castanea mollissima forest in forest land on barren hill.Result] In 2 kinds of aforestation modes,the management states of Castanea mollissima was similar.The annual average growth of ground diameter,plant height and crown width of Castanea mollissima in pure forest were 1.288 cm,0.644 m,0.594 m resp.and those of Castanea mollissimas in mixed forest were 1.125 cm,0.585 m,0.572 m resp.those of mature Castanea mollissima forest were 1.224 cm,0.608 m,0.581 m resp.Conclusion] The growth states of Castanea mollissimas in pure forest was better,and the prophase management on Castanea mollissima in mixed forest should be strengthened(applying more manure etc.).