Shi Juan, Luo Youqing, Song Jiying, Yan Xiaosu, Jiang Ping, Wang Yijiao
Key Laboratory for Silviculture and Conservation of Education Ministry, Beijing Forestry University, China.
Ying Yong Sheng Tai Xue Bao. 2006 Jul;17(7):1157-63.
The study on the plant diversity of Bursaphelenchus xylophilus-invaded Masson pine community under effects of different removal disturbance intensity showed that the species diversity indices (richness, Shannon-Wiener index and evenness) of arbor layer decreased in the sequence of broad-leaved stand after the removal of all infected pine trees in the pure pine stand in Fuyang > lightly infected Masson pine - Schima superba mixed stand in Fuyang > uninfected stand mixture of Masson pine and Castanopsis fargessi as the control > lightly infected pure Masson pine stand in Fuyang > Quercus variables stand formed after selective removal of infected pine trees from a mixed Masson pine and Q. variables stand in Zhoushan Islands > pure young Masson pine stand formed after the removal of all infected pine trees from a pure Masson pine stand > pure Liquidambar formosana stand after the removal of infected pine trees from a pure pine stand in Zhoushan Islands > mixed stand consisted of Pinus thunbergii and the Masson pine in Zhoushan Islands > moderately infected Masson pine stand in Zhoushan Islands. All the three indices of shrub layer did not show any significant differences among different communities, except for the pure pine stand in Zhoushan Island, which were the lowest. The three indices of herb layer were higher in pure young Masson pine, Q. variables stand, and L. formosana stand than in other stands. The Masson pine forest at different geographical situation and with different harm extent had distinct disparity, as well as that in different disturbance degree and restoring manner. The "Index of Disturbing Intensity of Stump and Fallen Woods" or IDISF was created to represent the disturbance degree of tree removal on plant diversity. It was found that for both less and more removal disturbing degree, the relationship between species diversity indices and IDISF followed the "Mid-altitude bulge" theory. Specifically, both excessive and insufficient removal of infected trees would cause the decline of plant species diversity in certain degree. Covariance analysis of IDISF indicated that different IDISF had no significant effects on the species diversity of arbor layer, but had different effects on that of shrub and herb layers, which could be used to assess the changes in species diversity of different Masson pine communities after the invasion of pine wood nematode.
对不同采伐干扰强度影响下松材线虫入侵马尾松群落的植物多样性研究表明，乔木层的物种多样性指数（丰富度、香农 - 威纳指数和均匀度）按以下顺序降低：富阳纯松林全部感染松树被采伐后的阔叶林分＞富阳轻度感染的马尾松 - 木荷混交林分＞以未感染的马尾松和栲树混交林分为对照＞富阳轻度感染的纯马尾松林分＞舟山群岛马尾松与枹栎混交林中选择性采伐感染松树后形成的枹栎林分＞富阳纯马尾松林全部感染松树被采伐后形成的纯马尾松幼林分＞舟山群岛纯松林采伐感染松树后形成的纯枫香林分＞舟山群岛黑松与马尾松混交林分＞舟山群岛中度感染的马尾松林分。除舟山群岛的纯松林分最低外，灌木层的这三个指数在不同群落间无显著差异。草本层的这三个指数在纯马尾松幼林、枹栎林分和枫香林分中高于其他林分。不同地理区位、不同危害程度的马尾松林差异明显，不同干扰程度和恢复方式的马尾松林也有明显差异。创建了“伐桩与倒木干扰强度指数”（IDISF）来表征树木采伐对植物多样性的干扰程度。研究发现，对于采伐干扰程度较小和较大的情况，物种多样性指数与IDISF之间的关系遵循“中海拔凸起”理论。具体而言，感染树木采伐过多或过少都会在一定程度上导致植物物种多样性下降。IDISF的协方差分析表明，不同的IDISF对乔木层的物种多样性无显著影响，但对灌木层和草本层的物种多样性有不同影响，可用于评估松材线虫入侵后不同马尾松群落物种多样性的变化。
