广西南宁46年生降香黄檀人工林生长规律

Growth rule for a 46-year-old Dalbergia odorifera in Nanning, Guangxi

针对广西南宁良凤江树木园内46年生降香黄檀Dalbergia odorifera人工林生长规律进行研究,通过进行树干解析的方法阐述这一珍贵红木树种的生长规律。结果表明：46年生降香黄檀平均树高、胸径、去皮单株材积分别为18.70 m,21.6 cm和0.401 9 m3·株-1。降香黄檀的树高连年生长量呈现明显的＂高—低—高＂规律,幼苗期其高增长较快,至35年生之后呈现较稳定的树高生长趋势并最终达到18.70 m。降香黄檀的胸径生长在46年生的生长期中出现2次较明显的稳定期,分别是14~28年生及32~46年生。在材积生长量方面,降香黄檀的材积生长在珍贵阔叶树中处于中上水平。降香黄檀在8年生前后开始出现心材,46年生时心材直径平均值为10.8 cm。

To protect a precious redwood tree, Dalbergia odorifera, this study determined the growth rule for a 46-year-old D. odorifera from Liang Fengjiang Garden in Nanning, Guangxi. Results showed an average tree height of 18.7 m, DBH of 21.6 cm, and volume of 0.401 9 m^3·tree^-1. Tree height followed an annual increment pattern of ＂highwlow--high＂ from the seedling stage to 35 years of age. Afterward a relatively stable growth in tree height occurred. DBH growth had two relatively obvious plateaus from years 14-28 and 32-46. Volume growth was high for a precious hardwood with heartwood in the most recent 8 years averaging a diameter of 10.8 cm.