鹦哥岭海南五针松的种内和种间竞争

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=aD~b),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。

Interaspecific and intraspecific competitions of Pinus fenzeliana in Yinggeling, Hainan Province

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=aD^b). 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.