炼山对南酸枣人工林林下物种多样性的影响

Effects of controlled burning on species diversity of undergrowth in Choerospondias axillaris plantations

运用α多样性指数和β多样性指数对炼山与不炼山处理南酸枣Choerospondias axillaris人工林林下植被物种多样性进行横向与纵向比较研究。结果表明:同期(3年生或6年生)炼山处理的南酸枣人工林灌木层、草本层及藤本植物的物种丰富度指数均小于不炼山处理的群落,其余各α多样性指数值在2种处理措施下呈现差异;在时间动态上,炼山处理的南酸枣人工林的灌木层、草本层和层外层(藤本植物)α多样性指数值增长幅度与不炼山处理的群落相比表现不同的变化趋势。2个β多样性指数可以定量和直观地描述炼山与不炼山处理对南酸枣人工群落林下植物组成(生境)的影响,且不同生长型物种表现不同的生态反应。

The α diversity indexes and β diversity indexes were used to study the species diversity of undergrowth in the Choerospondias axillaris plantations. The results showed that the species richness of shrub layer, herb layer and liana was lower in the control burning C. axillaris plantation than in the non-burning C. axikllaris plantation, and other numerical values of α diversity indexes showed difference at the same period. In the aspect of time dynamics, the increasing extent of α diversity indexes of shrub layer, herb layer and liana in the control burning C. axillaris plantation showed different change compared with the non-burning C. axillaris plantaion. The two β diversity indexes could quantitatively and definitely show the influence of control burning on undegrowth species composition （or habitat）, and different growth form plants show different ecological responses. [Ch, 2 tab. 20 ref. ]