雷州半岛15个阔叶树种混交幼林的生长分析*

通过15个阔叶树种2.5a生幼林在雷州半岛的生长比较,结果表明,树高、胸径和冠幅生长超过所有树种平均值的有水翁(Cleistocalyx operculatus)、盘架子(Winchia catophyua)、麻楝(Chukrasia tabularis)和秋枫(Bischofia javanica);按生长过程变化15个树种可分为3个类型:一是水翁、盘架子、秋枫和阴香(Cinnamomum burmanni),二是山楝(Aphanamixis polystachya)、麻楝、樟树(Cinnamomum camphora)、黎蒴栲(Castanopsis fissa)、火力楠(Michelia macdurei)、人面子(Dracontomelon duperreanum)、扁桃(Mangifera persiciformis)和榄仁树(Temninalia catappa),三是见血封喉(Antiaris toxicaria)、木棉(Bombax malabaricum)和无忧树(Saraca dives),不同类型的树种对生态位有不同要求,营造混交林应注意选择搭配。月平均温度、降雨量和相对湿度与多数种类的早期树高生长量与有较好的相关性,而与胸径和冠幅生长量的相关性则不明显。

Early growth performance of 15 indigenous broadleaved tree species in Leizhou Peninsula

Observations of 15 indigenous broadleaved tree species in young plantation in Leizhou Peninsula showed significant growths in tree height(H), diameter at breast height(DBH) and the canopy width(CW). The species with fastest growth included Cleistocalyx operculatus, Winchia calophyua, Chukrasia tabularis and Bischofia javanica. According to the monthly growth processes of H, DBH and CW,15 species can be classified into 3 growth types:the first type consists of Cleistocalyx operculatus, Winchia calophyua, Bischofla javanica, and Cinnamomum burmanni;the second includes Aphanamixis polystachya, Chukrasia tabularis. Cinnamomum camphora, Castanopsis fissa, Michelia macdurei, Dracontomelon duperreanum, Mangifera persiciformis and Temninalia catappa;the third type is Antiaris toxicaria, Bombax malabaricum and Saraca dives. Different demands of the species for habitat should be taken into account in afforestation projects with mixed species. The H growth was significantly correlated with monthly mean temperature, precipitation and relative humidity, while the DBH and CW were not significant in the early stage of young plantation.