毛乌素沙地樟子松与紫穗槐混交造林效果研究

Study on Growth Effect of the Mixed Plantation Composed of Pinus sylvestris var.mongolica and Amorpha fruticos in the Musu Desert Area

针对樟子松纯林地力衰退及虫害可能带来的不良后果,根据毛乌素沙地特点开展樟子松、紫穗槐混交造林技术研究,通过混交林与纯林的比较,分析樟子松与紫穗槐混交的造林效果。结果表明:与正常生长的樟子松相比,受害植株的生长量和生长势均极显著下降;与纯林相比,混交可以显著地提高樟子松的生长量和造林存活率;樟子松与紫穗槐混交具有明显的杀虫和驱虫效果,从而降低了虫害带来的不良后果;混交促进了群落环境的形成,其主要表现是群落郁闭度、物种丰富度以及枯落物和沙结皮积累明显高于樟子松纯林。

The silvicultural techniques to plant mixed stands composed of Pinus sylvestris var.mongolica and Amorpha fruticos were studied according to the characteristics of Musu sand land to mitigate the impact of site degradation and insect pest infestation resulted from pure plantation of Pinus sylvestris var.mongolica.The planting effect of mixed stand was analyzed by comparing the growth status of mixed stands with the pure stands.The results showed that planting the two tree species in mixed stands might prevent the plantation from pest damage and significantly increase the growth rate and survival rate of Pinus sylvestris var.mongolica.Compared to the pure stand of Pinus sylvestris var.mongolica,the coverage,species richness and the litter rate of the mixed stands and the formation of forest community environment could be significantly promoted.