粤北冰雪损毁杉木林人工恢复及林分结构特征分析

Artificial Restoration of Chinese Fir Plantations Damaged by Heavy Snow and Ice Disaster and Stand Spatial Analysis in Northern Part of Guangdong Province

以粤北冰雪灾害损毁杉木（Cunninghamia lanceolata）林套种阔叶树形成的混交林为对象，采用标准地调查法，研究人工干预形成针阔混交林的生长情况及其林分结构特征。结果表明，经过5a的人工修复，已形成良好的杉木阔叶树混交林，其中，萌芽杉木平均胸径达到4．41-5．48cm，木荷（Schima superba）、黎蒴（Castanopsis fissa）、火力楠（Michelia macclurei）、深山含笑（Michehia maudiae）、樟树（Cinnamomum camphora）平均胸径可分别达到2．72，6．03，2．59，1．75，3．30cm。在水平分布格局上，9个样地属随机分布，6个样地呈均匀分布，无样地呈聚集分布；树种混交度呈弱度、中度混交；各阔叶树相对于杉木的种间竞争优劣顺序依次为黎蒴、木荷、樟树、火力楠、深山含笑。不同配置的阔叶树种所形成林分的空间结构特征没有明显差异。

Based on surveying typical sample plots of the mixed plantations of Cunm＇nghamia laneeolata and broadleaf tree by artificial restoration from pure forest of C. laneeolata damaged by snow and ice disaster in northern Guangdong, the growth and stand structure characteristics of the mixed forest were analyzed. The results showed thatfive years later, superior mixed plantations were established. The diameter at breast height （ DBH ） of C. lanceolata ranged from 4.41 to 5.48 cm, and those of Sehima superha, Castanopsis fissa, Miehelia maeelureL Minnamomum maudiae and Cinnamornum eamphora were 2.72, 6.03, 2.59, 1.75 and 3.30 cm, respectively. In terms of horizontal distribution, 9 sample plots were detected to be random distribution, 6 plots were homogenous distribution, but no plot was aggregated distribution. The mixed plantations displayed weak or middle level of mingling degree. Compared with C. laneeolata, the competiveness order of interplanted broadleaf trees was C. fissa 〉 S. superha 〉 C. eamphora 〉 M. maeelurel＇〉 M. maudiae. No significant deviation in spatial structure was detected among different deployments.