长白山阔叶红松林共存树种径向生长对气候变化的响应

利用树木年轮学方法,通过研究长白山阔叶红松林建群树种红松和先锋树种山杨生长特征及其对气候因子 的响应,以期揭示不同物种对气候因子的响应差异。结果表明:红松和山杨对气候因子响应关系存在差异。红松 主要受上年冬季温度和降水的负作用,山杨主要受到生长季末降水的限制作用。在极端情况下,上一年冬季的高 温和较多降水以及当年生长季高温是导致红松形成窄轮的主要原因,而上一年生长季的较多降水和当年春季高温 是影响山杨生长的主要原因。因此,树木生长—气候因子的关系具有一定的物种特性。此外,还发现随着温度上 升和降水格局的改变,春季降水对红松生长的正效应以及月最低温度对红松和山杨的负效应将逐渐突显,这可能 是导致红松适宜区面积缩小的主要因素。 

Growth response of two coexisting species to climate change in broadleaved Korean pine forests in Changbai Mountain, northeastern China

In this paper,dendrochronology method was used to reveal the dynamic response way of different species’ radial growth to climate change. Group-species Pinus koraiensis and pioneer-species Populus davidiana were selected in Changbai Mountain of northeastern China. The results showed that radial growth of P. koraiensis was significantly positive with the temperature and precipitation in previous winter (P<0.05). Pioneer-species P. davidiana was significantly negative with precipitation in the end of current growing season. In the extreme year,warm and wet winter as well as warm growing season intensified the narrow ring formation of P. koraiensis. The ring-width of P. davidiana was controlled by precipitation in previous and temperature in current spring. The results added the evidence that there was specific response way of trees to climate factors. With the change of climate factors,the positive effect of spring precipitation on P. koraiensis and the limit function of minimum temperature on two species were enhanced. It may lead to the suitable region reduction of P. koraiensis in Changbai Mountain of northeastern China.