中文摘要：

生物多样性是衡量森林质量的重要指标，生物多样化是生态系统稳定的基础。综述了影响林下植物多样性的因素，指出：1）混交林的生物多样性优于纯林；2）老龄林群落具有较为丰富的物种和复杂的垂直层次结构；3）林分密度越小，越有利于林下植物的多样化；4）适度的间伐强度可显著提高林分的生物多样性。

英文摘要：

The species diversity is an important index to access forest quality, is also the base of stability of ecosystems. Factors of affecting understory plant diversity include： 1） Mixed forest is better at plant diversity than pure forest. 2） Old forest community is abundant in species and has complicated vertical layers. 3） The sparser stand density, the more plant species. 4） Plant diversity comes with moderate thinning.