梭梭(Haloxylon ammodendron)不宜用于树木年轮学研究

Tree Rings of Saxoul(Haloxylon ammodendron)are not Suitable for the Dendrochronological Studies

本文利用2009—2011年春季单次形成层创伤标记法,对梭梭是否具有可辨识的年轮特征和形成规律进行了实验研究。结果表明:梭梭具有清晰的轮层特征,内侧质地致密、颜色较深,外侧散生大量导管,质地疏松、颜色较浅,与其他树种年轮特征恰好相反;其轮层常不闭合,轮层宽度较为均一;但不具有可辨识的年轮/年层特征,其每年形成轮层数具有区域、个体和单枝不同方向的异质性特征,不宜用于年龄确定和树木年轮学相关领域的研究。

Using the cambial pining method in the spring of 2009--2011, this paper want to know whether Haloxyton ammodendron has the distinguishable tree rings. The results show that Haloxylon ammoden dron has clear growth zones, which have dark color and high density in the inner side, and light color and lower density with large amounts of tracheas in the out side, this character is very different from the normal tree rings of other tree species. The growth zones are not always close as a whole ring, and the widths of different growth zones in the same disc are normally equal. Meanwhile, Hatoxylon ammodendron does not have distinguishable tree rings, and the numbers of the growth zones are different for different regions, in dividuals and different directions of the disc, so that the Haloxyton ammodendron can not be used for the age＇s ascertainment and dendrochronological related areas.