不同郁闭度和坡位对杉木林下套种鄂西红豆树的影响

The effects of different canopy closures and slope positions on the intercropping of Ormosia hosiei under Cunninghamia lanceolata forests

对不同林分郁闭度、不同坡位杉木林下套种的鄂西红豆树生长及生物量进行调查分析。结果表明:不同坡位、不同郁闭度对杉木胸径及树高均有一定的影响,下坡位杉木平均胸径及树高与上坡位相比分别提高了59.65%及26.43%,郁闭度0.5~0.6的杉木平均胸径及树高与郁闭度0.3~0.4处理相比分别提高了22.80%及22.30%;不同郁闭度对鄂西红豆树胸径和树高的影响均依次为0.5~0.6>0.3~0.4>0,对枝下高及冠幅的影响为0>0.5~0.6>0.3~0.4,对树干、叶、根及总生物量的影响为0.5~0.6>0.3~0.4>0。不同坡位对鄂西红豆树胸径、树高、枝下高、总生物量的影响依次为下坡位>中坡位>上坡位;鄂西红豆树树高与胸径、冠幅与胸径及树高呈极显著正相关,干、枝、叶生物量与根生物量呈极显著正相关。下坡位且杉木林分郁闭度为0.5~0.6适合杉木林下套种的鄂西红豆树。

The growth and biomass of Ormosia hosiei under Chinese fir(Cunninghamia lanceolate)forest with different canopy closures and different slope positions were investigated and analyzed.The results showed that different slope positions and canopy closures had certain effects on the DBH and tree height of Chinese fir forests.The average DBH and tree height of Chinese fir on the downhill slope increased by 59.65%and 26.43%respectively compared with the upper slope position.The average DBH and tree height of Chinese fir with canopy closures of 0.5~0.6 increased by 22.80%and 22.30%respectively compared with canopy closures of 0.3~0.4.The effects of different canopy closures on DBH and height of O.hosiei were 0.5~0.6>0.3~0.4>0,the effects on height under branches and crown width were 0>0.5~0.6>0.3~0.4,and the effects on trunk,leaves,roots and total biomass were 0.5~0.6>0.3~0.4>0.The effects of different slope positions on DBH,tree height,height under branches,and total biomass of O.hosiei were descending slope position>middle slope position>upper slope position;tree height and DBH,crown width and tree height of red bean trees in O.hosiei were extremely significantly positive correlated,and stem,branch and leaf biomass were extremely significantly positive correlated with root biomass.O.hosiei with a downhill position and a canopy density of a fir forest of 0.5~0.6 are suitable for interplanting under Chinese fir forest.