不同立地条件对台湾桤木木材物理性质的影响

以四川乐山和广元两地引种的6年生台湾桤木为试验样木,选择4个标准试验样地取样,进行木材物理性质分析;采集树木生长地土壤样品,收集近5年气象资料,并进行相关性分析,探索影响台湾桤木木材性质的主要相关因子。结果表明,不同立地条件的台湾桤木木材物理性质差异是显著的;立地因子与木材物理性质有典型相关关系,土壤的N、P、K含量、土壤pH值、年降雨量、年日照时数和海拔高度是主要影响因子;提高土壤中缓效K和全N的含量,降低全P的含量,可以提高台湾桤木的木材品质。全K、有效P、pH、年日照时数增加与年降雨量减少虽然增加了木材的干缩率,却有利于台湾桤木基本密度增加。尽管在较低海拔高度种植台湾桤木,木材气干密度会减小,然而其材质基本密度可以得到提高,同时降低全干时木材弦向和体积干缩率。

Influence of different site conditions on the wood physical properties of Alnus formosana

The physical properties of six-year-old Alnus formosana collected from four standard testing grounds of Leshan and Guangyuan city in Sichuan Province were tested,and meteorological data in recent five years and soil samples of these places in which Alnus formosana grown were collected.The major correlation factors influencing the properties of Alnus formosana were explored using correlation analysis method.Results indicated that the differences of the physical properties of Alnus formosana from different site conditions were significant;canonical correlation existed between site conditions,and physical properties,contents of N,P,K,pH of soil,annual rainfall,sunshine duration and altitude were the main factors.The quality of Alnus formosana im-proved with the increase of the contents of slowly available K and total N and the reduction of the content of total P.The raise of the content of total K and available P,pH,sunshine duration,and the decrease of annual rainfall enhanced the shrinkage of timber and the basic density of Alnus formosana.The air-dry density and volume and tangential shrinkage of oven-dried Alnus formosana which planted in lower altitudes decreased,and basic density increased at the same time.