亚热带退化红壤区人工林补植树种成活率与生长量分析

摘要

选取木荷、樟树、刨花楠、闽楠、湿地松、枫香等亚热带适生树种，在典型退化红壤区江西省泰和县20年人工马尾松林下进行了林木补植，分析了野外生长一年后各补植树种的成活率和地径、树高、冠幅等生长量状况，为退化红壤区人工林生态恢复提供参考依据。结果表明：人工林下补植树种中成活率最好的是木荷（100％）及湿地松（81．88％），最差的是樟树（46．67％）和刨花楠（46．67％）；生长量方面，湿地松综合长势最好，冠幅（1708．14 cm2）、地径（1．82 cm ）、株高（71．73 cm ）均优于其他单一补植树种，闽楠的冠幅（158．79 cm2）、地径（0．37 cm ）、株高（16．73 cm ）等相对最差。成活率与株高具有显著相关性（ P＝0．04），冠幅、地径、株高等生长量之间呈极显著相关（P＝0）。说明在该区域内开展林下补植的适生树种为湿地松和木荷。%The article selectssomesubtropical tree species ,includingSchima superba ,Cinnamomum camphora ,Machi-lus pauhoi Kanehira ,Phoebe bournei ,Pinus elliottii Engelmann ,Liquidambar formosana Hance ,to replant under a 20-year artificial forest ofPinus massoniana ,in a typical degraded red soil region of Taihe Countyin Jiangxi Province . After one year ,the article analyzes the differences of each replanting tree's survival rate ,ground diameter ,tree height ,and crown width ,which provide reference and guidance for the artificial forest's ecological restoration .The results show that the best survival rate of artificial forest replanting trees is Schima superba(100% ) and Pinus elliottii Engelmann (81 .88% ) ,while the worst is Cinnamomum camphora (46 .67% ) and Machilus pauhoi Kanehira (46 .67% );In terms of increment ,the Schima superba has the best comprehensive growing trend ,whose crown width(1708 .14 cm2 ) ,ground diameter(1 .82cm) and tree height (71 .73cm) are superior to the other single replanting tree species ,but the crown width(158 .79 cm2 ) ,ground diameter(0 .37cm) and tree height (16 .73cm) of Phoebe bourneiare relatively poor .Survival rate and plant heightis significantly correlated (P=0 .04) .The three increments of crown width and ground diameter and tree height show highly significant correlation (P=0) .Therefore ,the arti-cleproposes that the suitable tree species tobe replanted under forest in the region are Pinus elliottii Engelmann and Schima superba .