不同郁闭度下天然白皮松林更新的研究

通过对五鹿山自然保护区内白皮松林的调查,研究了不同郁闭度下白皮松的天然更新情况.结果表明:不同郁闭度对白皮松的天然更新影响极大,对林下更新幼树的树高、地径、株树的影响均达到了极显著水平.随着郁闭度的增加,林下幼树的平均树高和地径也增大,而单位面积株数却减小,更新幼树由团状分布逐渐趋向于均匀分布.在郁闭度小于0.7时,白皮松林下天然更新成功率高;当郁闭度大于0.8时,天然更新的幼树少,而且成活率降低.

The Study of Regeneration of Natura Pinus bungeana in Different Forest Canopy Closure

Through investigation on forest of Pinus bungeana in nature reserve in Wulu mountains,the natural regeneration of Pinus bungeana in different forest canopy closure are studied.The result shows that different canopy closure has great impact on natural regeneration of Pinus bungeana,the influence of different canopy closure on high,diameter and numbers of saplings is very significant.With the forest canopy closure increase,the average high and diameter also increase,but the numbers of unit area is reduced.And the distribution of update saplings changes from mission to uniform.When the forest canopy closure is less than 0.7,the success rate of regeneration is high;when the forest canopy closure is greater than 0.8,the numbers of saplings is less,and survival rate is low.