长白山落叶松与鱼鳞云杉生长-气候关系的种间差异

为阐明不同树种间树木径向生长对气候变化的响应及其时间稳定性,本研究以长白山北坡高海拔处(1600～1750 m)落叶松和鱼鳞云杉为研究对象,运用年轮年代学方法探究树木径向生长与气候的关系.结果表明: 研究区落叶松生长与当年6月最高气温呈显著正相关,与当年6月降水呈负相关;鱼鳞云杉与当年5月最高温度呈显著正相关.冗余分析进一步表明,落叶松生长主要受夏季温度的影响,鱼鳞云杉生长主要受春季温度的制约.在1959—2014年,落叶松生长-夏季温度关系相对稳定;对于鱼鳞云杉,自1986年以来其与春季温度的相关性减弱,可能由于最高温度降低导致树木生长减慢.本研究结果可以为预测气候变化情景下长白山针叶树种生长的响应趋势提供数据支持和理论参考.

Interspecific difference of relationship between radial growth and climate factor for Larix olgensis and Picea jezoensis var. komarovii in Changbai Mountain,Northeast China.

To clarify the responses of radial growth of different tree species to climate change and its stability, we explored the relationships between radial growth and climate factors of larch (Larix olgensis) and spruce (Picea jezoensis var. komarovii) distributed at high altitude (1600-1750 m) on the northern slope of Changbai Mountain, using the chronological method. The results showed that the growth of larch was significantly positively correlated with the maximum temperature in June and negatively correlated with the precipitation in June. The radial growth of spruce was significantly positively correlated with the maximum temperature in May. Results from redundancy analysis showed that larch growth was mainly affected by summer temperature, while spruce growth was significantly restricted by spring temperature. During 1959-2014, the relationship between larch growth and summer temperature was relatively stable. For spruce, the correlation between radial growth and spring temperatures had gradually weakened since 1986, mainly due to the growth slowdown because of decreased maximum air temperature. Our results provide theoretical references for predicting the growth response of conifers at Changbai Mountain region in the context of climate change.