不同干扰措施对松材线虫入侵松林内物种多样性的影响

经野外调查发现:松材线虫入侵松林后,对原先林型相同的两块染病松林而言,经过人为伐除和保留受害木这两种干扰措施后,任其自然恢复更新,后恢复的林型会大不相同,即对受害木采取不同的干扰措施会对染病松林内林下植被的更新产生不同的影响.基于以上出发点,以松材线虫入侵后采取不同伐除干扰措施的2个马尾松受害群落为研究对象,针对受害木移除和保留两种处理方式,选择α多样性指数函数Rényi指数为测量单位,探讨了不同受害木处理方式下植物多样性的变化规律.结果表明:受害木及时移走的松林内林下灌草多样性比受害木保留的要高.

Effects of different disturbance ways on the diversity of pine forest invaded by pine wood nematode (Bursaphelenchus xylophilus)

Through field investigations it was observed that after Bursaphelenchus xylophilus (Steiner and Buhren) Nickle (pine wood nematode) invaded a pine forest, subsequently formed forest types would be significantly different from each other if two managing ways such as human removal and reserving damaged trees were taken before a natural regeneration, namely different disturbance measures taken for damaged trees would affect regeneration direction of understory vegetation of an infected pine forest. Based on the above observation, the dynamics of plant diversity under different managements of damaged trees were studied by choosing two Masson pine communities that were subjected to managements of removal and reserving damaged trees, respectively, after the invasion of pine wood nematode. α diversity index function-Rényi index was used as a measurement. The results showed that the species diversity of shrub and herb layers of the pine forest in which damaged trees were removed timely was higher than that in which damaged trees were reserved.