阿克苏河径流量变化对胡杨年轮生长的影响

Effects of Aksu river runoff changes on tree-ring growth of Populus euphratica

本文借鉴树木年轮学方法,运用LINTABTM6树木年轮测定仪读取胡杨样芯径向生长量,研究阿克苏河流域内胡杨年轮生长特点和周期性及径流变化关系。结果表明:(1)阿克苏河胡杨径向生长1993年以前较为平稳,之后呈波动上升,胡杨的年轮指数变化与径向生长量的变化在时间尺度上具有一致性。(2)胡杨年轮指数周期性震荡变化特征明显,在第一周期19 a特征的时间尺度上,胡杨年轮指数变化平均周期为12年左右,大约2.5个周期胡杨年轮指数的升降变化;在第二周期12 a时间特征尺度上,大约经历了3.5个周期胡杨年轮指数的升降变化平均周期为8 a左右;在第三周期5 a年时间特征尺度上,大约经历了3个周期胡杨年轮指数的升降变化。(3)阿克苏河胡杨年轮生长与当年3月时段径流量显著相关,该时段径流影响沿岸胡杨年轮生长,该要素对过去径流重建具有重要指导意义。

Tree-ring method, this paper, using LINTABTM6 tree-ring meter reads euphrates poplar sample core radial growth, Euphrates poplar growth rings in the Aksu river basin characteristics and periodicity and runoff change relations. Results show that：（l） The Aksu river Euphrates poplar radial growth relatively stable before 1993, after a rise by volatility, rings index change with the change of radial growth consistent on time scales; （2） Because the periodic oscillation rings index variation characteristics, in the first cycle 19 a characteristic time scales, populus euphratica tree ring index change average period of 12 years or so, approximately 2.5 cycles of P euphratica tree-ring index changes; 12 a time in the second cycle characteristic scales, about 3.5 experienced a period of tree-ring index changes in average period of 8 years; 5 a year in the third cycle characteristic scale, roughly experienced three cycles of tree-ring index changes; （3） The Aksu fiver Euphrates poplar growth rings with 3 month period was significantly associated with runoff, runoff affect the growth offings along the time, the key elements of rtmoffhas important guiding significance to the reconstruction of past.