广元市退耕还林区林下物种多样性分析

为探讨不同植被恢复方式对植物多样性的影响,对嘉陵江上游低山暴雨区不同植被恢复类型的物种多样性进行了研究.结果表明：不同植被恢复方式作用下群落中的物种组成不同、各物种的重要值也不一样（表2、3）;各群落物种数及多样性指数差异较大（表4）;人工植被恢复有利于群落维持较高的物种多样性;在退耕还林中确定合理的栽植密度和营造混交林可使林分形成良好的乔、灌、草立体结构.

Species Diversity Composition of Understory Plant within the Area of Sloping Farmland Conservation in Guangyuan City

Species diversity is one of the key indices, which can be used to evaluate the stability of forest community. It is important to enhance environment and control the loss of soil and water that the higher species diversity should be maintained within the artificial vegetation in gravely degraded land. Therefore, the species diversity within the different restoration forests of soil and water conservation in low hill heavy rain area of the upper reach of the Jialing River has been surveyed. The results indicate: the species diversity and important value of communities in different restoration stands vary greatly (in table 2 and 3); the species richness and diversity indices of communities in different restoration stands vary greatly (in table 4); the artificial restoration is beneficial to maintain higher biodiversity; the positive vertical structures of tree, shrub and herb can be reached by selecting the reasoning plantation density and afforesting the kilter mixed forest.