Hegyi's single-tree competition index was selected from several competition indices and to be used for the intra-and interspecific competition intensities of Tsuga chinensis var. Tchekiangensis trees in a natural forest in Cuzngze, Fujian, China. The results showed that the intraspecific competition intensity of T. Chinensis var. Tchekiangensis was 52.03, and was higher than any other interspecific competition intensities, but lower than the sum of all the interspecific competition intensities (164.08). The order of the intraspecific and interspecific competition intensities received by T. Chinensis var. Tchekiangensis was: T. Chinensis var. Tchekiangensis > Schima superba > Rhododendron simiarum > Castanopsis eyrei > Sorbus dunnii > Cyclobalanopsis gracilis > Rhododendron latoucheae > Cleyera pachyphylla > Pinus taiwanensis > Lithocarpus iteaphyl-lus > Toxicodendron succedaneum > Acanthopanax evodiaefolius > Ternstroemia kwangtungensis > Cryptomeria fortwiei > Uquid-ambar formosana > Ilex ficoidea > Sorbus folgneri > Pieris polka > Dendropanax dentiger > Ilex purpurea > Halesia macgregorii. The competition intensities received by T. Chinensis var. Tchekiangensis were decreased with the increase in diameter at breast height ( DBH) of objective trees. When DBH of objective trees reached 30 cm, the competition intensities changed little. The relationships between competition intensities and DBH of objective trees were closely followed the power function.%通过各种竞争指数的比较,提出采用Hegyi单木竞争指数模型研究福建光泽天然林中南方铁杉在生长发育过程中受到的种内和种间竞争强度.结果表明,南方铁杉受到的种内竞争指数为52.03,高于任一其他树种的竞争指数,但低于种间竞争指数总和(164.08).南方铁杉受到的种间和种内竞争大小顺序为:南方铁杉＞木荷＞猴头杜鹃＞甜槠＞棕脉花楸＞小叶青冈＞鹿角杜鹃＞厚叶红淡比＞黄山松＞鼠刺叶石栎＞野漆＞吴茱萸五加＞厚叶厚皮香＞柳杉＞枫香＞榕冬青＞石灰花楸＞马醉木＞树参＞冬青＞银钟花.南方铁杉对象木受到的竞争强度随着对象木径级的增大呈明显减少趋势.当对象木胸径大于30 cm后,个体受到的竞争强度趋于稳定.竞争指数与对象木胸径的关系呈幂函数关系.
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