Abstract: This study investigated the competitive growth dynamics between Pinus massoniana and Chinese fir (Cunninghamia lanceolata), and examined the influence of their respective mixed forest compositions on tree growth and soil physicochemical properties. The research focused on Chinese fir stands naturally invaded by P. massoniana through seed wind dispersal, as well as mixed forests P. massoniana and Chinese fir in combination with broadleaf species Cyclobalanopsis elevaticostata. Tree growth indices and soil physicochemical characteristics were measured and analyzed across these forest types. The main findings were as follows: (1) In the early stages, mixed broadleaf-conifer forests exhibited higher canopy closure and superior tree height, diameter at breast height (DBH), and volume growth compared to pure P. massoniana and Chinese fir mixed forests, despite a lower stand density due to higher mortality rates of broadleaf trees. Furthermore, P. massoniana demonstrated better growth than Chinese fir in both forest types. (2) Soil physical properties showed no significant variation across different soil layers within the same forest type. However, soil bulk density increased with depth, while capillary water-holding capacity and capillary porosity decreased in mixed broadleaf-conifer stands. (3) Soil pH was consistently below 4.5 and no difference in the same stand. The concentrations of total potassium, total phosphorus, organic matter, and alkali-hydrolyzable nitrogen were higher in mixed broadleaf-conifer forests compared to P. massoniana and Chinese fir mixed forests, although the levels of available potassium and phosphorus were lower. In conclusion, natural seed invasion of P. massoniana proved strong, with this species demonstrating greater suitability for growth in the region. Mixed broadleaf-conifer forests were more effective in enhancing soil fertility compared to pure P. massoniana and Chinese fir stands, with P. massoniana exhibiting superior growth in both forest types. These findings provided valuable insights for the sustainable management of artificial forests.

Key words: mixed plantation, tree growth, soil physicochemical properties, Cunninghamia lanceolata, Pinus massoniana, Cyclobalanopsis elevaticostata

摘要： 为了探索闽东区马尾松Pinus massoniana与杉木Cunninghamia lanceolata生长竞争力及其形成混交林对林木生长及土壤理化性质的影响，选择马尾松种子自然飞播侵入的杉木林、杉木与突脉青冈Cyclobalanopsis elevaticostata阔混交林形成的杉松混交林与杉松阔混交林为对象，测定并分析其林木生长与土壤理化指标。结果显示：(1) 杉松阔混交林初期，阔叶树死亡率高，故马尾松种子飞播入侵较多，形成的林分密度较低，但其郁闭度较大，其树高、胸径生长量及蓄积量均优于杉松混交林，马尾松的生长势均优于杉木；(2) 同一林分中不同土层的土壤物理性质有一定的差异，随着土层深度增加土壤容重均增大，针阔混交林的土壤毛管持水量与毛管孔隙度均逐渐下降；(3) 林下土壤pH＜4.5，同一林分不同土层土壤pH差异较小；针阔混交林的全钾、全磷、有机质、碱解氮含量均高于杉松混交林，而速效钾、有效磷含量相对较低。马尾松种子自然飞播入侵力强，且适宜该区域生长；杉松阔混交林优于杉松混交林，有利提高土壤肥力；两种林分的马尾松生长势均优于杉木。该结论可为人工林的可持续经营提供有益参考。

关键词: 混交林, 林木生长, 土壤理化性质, 杉木, 马尾松, 突脉青冈