天柱山黄山松种内与种间竞争的研究

Study on intraspecific and interspecific competition of Pinus taiwanensis

关键词:  竞争指数  黄山松  种内竞争  种间竞争

Key words:  competition index  Pinus taiwanensis  intraspecific competition  interspecific competition

摘要:

采用改进的竞争指数模型研究安徽天柱山黄山松的种内和种间竞争强度。结果发现:(1)随对象木胸径的增大,黄山松种群因自然稀疏过程中密度调节作用,植株距离增加,种内竞争强度降低;(2)黄山松群落内其它物种虽然较多,但个体普遍较小,结果种间竞争相对较弱,种内与种间竞争关系顺序为:黄山松—黄山松>杉木—黄山松>枹栎—黄山松>其它树种—黄山松;(3)竞争强度和对象木胸径的关系服从幂函数关系(CI=AD^-B),当黄山松胸径达到20 cm以上时,竞争强度变化不大,所得的预测模型能很好地预测黄山松种内和种间的竞争强度;(4)改进的竞争指数模型能很好地度量黄山松的种内和种间竞争强度,改进的确定邻体范围的方法能有效地确定黄山松的竞争范围。

Abstract:

Pinus taiwanensis is a common species,and it is one of the dominant species in subtropical area. The intraspecific and interspecific competitions of P.taiwanensis were analyzed quantitatively by using the improved competition index. The results show that with the increase of the size of objective tree and the distance between plants,the intraspecific competition intensity decreases,because of the population density regulation during self-thinning. In the community,there are many other species,but their diameter at breast height is less than that of P.taiwanensis,as a result,the competition intensity of intraspecific was more excessive than that of interspecific. The order of competition intensity is P.taiwanensis—P.taiwanensis>Cunninghamia lanceolata—P.taiwanensis>Quercus glandulifera—P.taiwanensis>other species—P.taiwanensis. The relationship between competition intensity and individual growth of objective tree follows closely the following equation CI=AD^-B,and the changing of competition intensity is very small when the diameter of the objective tree grows to 20 cm. The model can simulate and predict the intraspecific and interspecific competition efficiently. The study provides a new approach to measure the competition intensity and to ascertain the neighborhood zone on studying the plant competition.