不同间伐保留密度下杉木大径材-闽楠复层林经营效果

于2017年-2020年在位于福建省邵武市卫闽镇国有林场27年生杉木人工林为研究，进行不同间伐保留密度下杉木大径材-闽楠复层林研究，设置套种闽楠，杉木保留密度40株/亩与套种闽楠，杉木保留密度60株/亩两种间伐保留密度，同时以不间伐不套种措施作为对照。对样地内的杉木和楠木进行调查，研究复层林经营对林分生长和材种结构的影响观测并记录间伐前后林木生长指标（胸径、树高）数据。

This study was conducted from 2017 to 2020 at the State-owned Forest Farm in Weimin Town, Shaowu City, Fujian Province, based on a 27-year-old Cunninghamia lanceolata (Chinese fir) plantation. We investigated the stratified mixed stand of Chinese fir (targeted for large-diameter timber) and Phoebe bournei under two thinning retention density treatments: 1) interplanting with Phoebe bournei while retaining 40 Chinese fir trees per mu; 2) interplanting with Phoebe bournei while retaining 60 Chinese fir trees per mu. An untreated control group (no thinning and no interplanting) was also set up. All Chinese fir and Phoebe bournei trees in the sample plots were surveyed, and the effects of multi-layered stand management on stand growth and timber product structure were analyzed. Tree growth indicators including diameter at breast height (DBH) and tree height were measured and recorded before and after thinning.