杉木-观光木人工混交林林木竞争效应研究

The Tree Competition Effects in the Artificial Mixed Forest of Cunninghamia lanceolata and Tsoongioden odorum

摘要:

将人工混交林中林木竞争影响空间划分为内、外两圈，采用Hegyi提出的单木竞争指数模型对福建省建瓯东安林场杉木(Cunninghamia lanceolata)-观光木(Tsoongioden odrum)混交林中林木的种内、种间竞争强度进行分析。结果表明，无论是内圈还是外圈，杉木种内、种间竞争强度均随林木径级的增大而减小；竞争强度顺序为：内圈杉木种内竞争>内圈杉木观光木种间竞争>外圈杉木种内竞争>外圈杉木观光木种间竞争。用模型拟合预测杉木种内、种间的竞争强度，认为杉木在胸径达到36 cm之前应采取适当的控制措施。

Abstract:

The effect space of tree competition in the artificial mixed forest of Cunninghamia lanceolata and Tsoongioden odrum in Dong’an Forestry Farm of Jian’ou, Fujian Province, was divided into two parts, inside radius and outside radius. The interspecific and intraspecific competition intensities of C. lanceolata and T. odrum were analyzed by using Hegyi’s Individual Tree Competition Index model. The results showed that all competition intensities of C. lanceolata, including intraspecific competition and interspecific competition, reduced with increasing of tree diameter classes in the both competition radiuses. The order of competition intensity was followed as intraspecific competition intensity of C. lanceolata in the inside radius > interspecific competition intensity of T. odorum in the inside radius > intraspecific competition intensity of C. lanceolata in the outside radius > interspecific competition intensity of T. odorum in the outside radius. The competition intensity in the forest was predicted by the simulation model, which indicated that some management measures should be conducted to decrease the competition intensities of C. lanceolata before the diameter at breast height of C. lanceolata up to 36 cm.