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鹦哥岭海南五针松的种内和种间竞争

来源:公文范文 时间:2023-01-02 09:36:01 推荐访问: 五针松 海南 海南之旅心得体会

摘要: 为了探讨海南五针松群落内物种间的竞争关系,该研究通过对海南鹦哥岭国家级自然保护区海南五针松群落内56株对象木及442株伴生种竞争木的调查,运用Hegyi的单木竞争模型分析其种内和种间竞争强度。结果表明:海南五针松的种内和种间竞争强度分别为31.31%和68.69%,说明竞争主要来自种间。海南五针松伴生种较多,种内与主要伴生种间的竞争关系为海南五针松>线枝蒲桃>海桐山矾>五列木>印度锥>杏叶柯>红鳞浦桃>海南猴欢喜>毛棉杜鹃>浦桃>木荷。竞争强度随海南五针松胸径的增大而减小,当海南五针松的胸径到达35 cm时,竞争强度变化很小,二者符合幂函数关系(CI=aDb),所得模型能很好的预测海南五针松的种内和种间竞争强度。根据竞争模型预测,在海南五针松胸径达到35 cm之前,应对严重影响其生长的伴生种进行修枝或择伐,以保证其获得足够的生存资源,达到保护这一物种的目的。

關键词: 鹦哥岭, 海南五针松, 种内竞争, 种间竞争, 竞争指数

中图分类号: Q948.12

文献标识码: A

文章编号: 10003142(2017)06077607

Abstract: To clarify the competition of Pinus fenzeliana community, we investigated the intra and interspecific competition of P. fenzeliana in the Hainan Yinggeling Natural Reserve, using Hegyi individual competition indices(CI) model. The competition intensity was analyzed from the 56 objective trees and 442 concomitant competitive trees within the P. fenzeliana community. The results were as follows: The intra and interspecific competition intensities of P. fenzeliana accounted for 31.31% and 68.69% respectively in the total competition intensity, indicating a remarkable effect of interspecific competition. The value of the main competition intensity was laid out in numerical order, i.e., P. fenzeliana> Syzygiumar aiocladum> Symplocos heishanensis> Pentaphylax euryoides> Castanopsis indica> Lithocarpus amygdalifolius> Syzygium hancei> Sloanea hainanensis> Rhododendron moulmainense> Syzygium jambos> Schima superba. Notably, the competition intensity of Pinus fenzeliana decreased inversely with the growth of the DBH, when the diameter of the P. fenzeliana reaches 35 cm, the competition intensity changes very little, and the relationship between the forest stand competition intensity and DBH of the target trees follows the power function(CI=aDb). In conclusion, this model could effectively predict the intraspecific and interspecific competitions of P. fenzeliana. According to the competition model, to ensure enough survival resources for P. fenzeliana and achieve the purpose of protecting this species, the companion which strongly influence P. fenzeliana should be pruned or thinned before DBH of P. fenzeliana reached 35 cm.

Key words: Yinggeling, P. fenzeliana, intraspecific competition, interspecific competition, competition index

竞争现象在自然群落中普遍存在,作用在种群上,将影响其空间分布、动态和群落的物种多样性(Weiner, 1990; Yokozawa et al, 1998)。植株之间的竞争本质上是对共同需要的有限资源环境的抢夺,作用在个体上就是被选择与淘汰,这种争夺在同种间表现为自疏现象,在异种间表现为种间竞争(李博等, 1998)。而作为植物种内和种间相互作用的主要表现形式(孙嘉男等, 2010),竞争的最终结果是使相邻植株达到相对稳定的最佳生态位(金则新等, 2004)。在早期有关物种保护的研究中,已有学者尝试运用竞争模型进行了探索(Schoener, 1983)。之后相继出现了包括不同竞争模型在具体应用中的对比(段仁燕等, 2007; 张跃西, 1993),以及不同林型和一些濒危植物与伴生种竞争关系的研究(段仁燕, 2005; 马世荣等, 2012; 孙澜等, 2008; 吴巩胜和王政权, 2000; 张思玉和郑群, 2001)。

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