浙江天童披针叶茴香群落种间联结性研究

Studies on the Interspecific Association of Illicium lanceolatum Community in Tiantong Region, Zhejiang Provincelanceolatum community in Tiantong region, Zhejiang Province

摘要:

通过基于2×2列联表的种间联结分析和χ2检验，对浙江天童保存较好的披针叶茴香(Illicium lanceolatum A. C. Smith)群落的种间联结性进行研究，以揭示披针叶茴香在群落中的地位及种间联结与群落稳定性的关系。结果表明：(1)群落内所有树种间总体呈显著正联结[W(49.607)＞χ20.05, 32(46.194)]；群落内所有物种间显著正联结的种对数比例高于显著负联结的种对数比例，但无显著联结种对数的比例最大。这表明群落处于稳定共存的状态。(2)披针叶茴香与石楠、尖萼毛柃、苦槠、四川山矾等7种呈显著正关联，仅与枫香呈显著负联结，与多数种间联结性不显著；披针叶茴香与多数种的联结系数(AC)值大于0.5(74.3%)，其中正联结种对数明显多于负联结种对数，表明披针叶茴香在群落中处于优势地位，与多数种群互利共存。此研究结果对制定该物种合适的就地保护措施、种群恢复以及人工规模栽培配置模式、生境的选择具有重要参考价值。

Abstract:

Illicium lanceolatum A. C. Smith, an important and endangered medicinal plant of China, has declined rapidly in population size in recent years. Interspecific associations, which play an important role in ecosystem function, can reflect interspecific competition within community. The species association in I. lanceolatum community was studied based on 2×2 contingency tables of species, including analysis of species association and χ2 test. The results showed that the significant positive associations [W(49.607)＞χ20.05,32(46.194)] were present among the tree species as a whole in the community. The percentage of species-pairs with significant positive association among them was higher than that with significant negative association, and the number of species-pair without significant association had the highest percentage, which implied that the community was stable. There were significant positive associations between I. lanceolatum and species, such as Photinia serrulata, Eurya acutisepala, Castanopsis sclerophylla and Symplocos setchuensis etc., and the significant negative association only occured with Liquidambar formosana, but it had no correlationship with most species. The association coefficients (AC) between I. lanceolatum and most species are more than 0.5 (about 74.3%), with positive species-pairs more than negative, which implied a dominant status of I. lanceolatum in the community and a coexisting relation with other species. These results can provide a valuable reference for the population protection, in situ, rehabilitation and planting mode and habitat selection.