阿尔泰山萨彦岭4种优势树种径向生长对气候因子的响应

气候变化深刻地影响森林树木的生长，而树种对气候变化敏感度的差异可能影响了气候变化下的森林生态系统响应。因此，研究优势树种间生长对气候变化的敏感度差异，对正确认识气候变化下林分生长动态及分布格局十分重要。基于树木年代学的方法，研究了阿尔泰山萨彦岭西伯利亚落叶松（Larix sibirica）、西伯利亚红松（Pinus sibirica）、西伯利亚冷杉（Abies sibirica）以及西伯利亚云杉（Picea obovata）4种优势树种的径向生长-气候关系。结果显示：（1）西伯利亚冷杉径向生长与上一年10-11月、当年1-9月的干旱指数、2-4月的降水显著正相关，与1月的平均温和最高温呈显著负相关关系，与当年4、6月份的水汽压正相关；（2）西伯利亚落叶松径向生长与上一年8月和当年8月的平均温、最高温以及当年8月的最低温显著负相关，而与当年6月的最低温则正相关，与8月份的水汽压显著负相关；（3）西伯利亚红松径向生长与3月降水、7月最低温、上一年10月的水汽压显著正相关；（4）西伯利亚云杉径向生长与6月平均温、最高温、水汽压正相关，与上一年10-11月、当年2-4月和9月的干旱指数正相关，同时与3、4月的降水量显著正相关。西伯利亚冷杉和西伯利亚云杉、西伯利亚云杉和西伯利亚落叶松、西伯利亚云杉和西伯利亚红松对于特定气候因子表现出相似的响应结果，与年表间相关性的结果一致。但差异也是明显的，西伯利亚冷杉和西伯利亚云杉对区域水分变化敏感，而西伯利亚落叶松和西伯利亚红松主要对区域温度变化敏感。综上所述，气候变化下，该区域优势树种对气候变化响应的差异可能导致区域林分动态和格局的改变，因此，多树种径向生长-气候关系研究有助于正确反映森林动态。研究结果可以为区域森林管理与生态保护工作提供理论依据。

Radial growth response of four dominant tree species to climate factors in the Sayan Range of the Altai Mountains, Russia

Climate change has a profound impact on the growth of forest trees, and the sensitivity of different tree species to climate change may influence the response of forest ecosystem under climate change. Therefore, it is extremely important to study the differences in the growth sensitivity among dominant tree species to climate change, to correctly understand the growth dynamics and distribution pattern of tree species stand under climate change. Based on the standard method of dendrochronology, we selected the tree-ring width index of four dominant tree species, including Larix sibirica, Pinus sibirica, Abies sibirica and Picea obovate on the Sayan Range of the Altai Mountains, Russian. We focused on the characteristics of standard chronologies and the relationships between the standard chronologies and the six climatic factors. The results showed that (1) there was a significantly positive correlation between radial growth of A. sibirica and PDSI from October to November of the previous year and from January to September of the current year, precipitation from February to April, and the mean and maximum temperature in January. Additionally, vapour pressure in April and June of the current year was positively correlated with radial growth. (2) The radial growth of L. Siberian was negatively correlated with the mean temperature, maximum temperature, minimum temperature and vapour pressure in August of the current year, the mean temperature and maximum temperature in August of the previous year, and positively correlated with the minimum temperature in June. (3) The radial growth of P. sibirica was significantly and positively correlated with the precipitation in March and the minimum temperature in July, also the vapour pressure in last October. (4) The radial growth of P. obovate was positively correlated with the mean temperature, maximum temperature and mean vapor pressure in June, PDSI from October to November of previous year and from February to April and September of current year. Our findings showed that there were similar results of tree radial growth-climate factors between species. But there were differences between tree species that A. sibirica and P. obovate was sensitive to regional water, while L. Siberian and P. sibirica was mainly sensitive to regional temperature. The difference of the response of dominant tree species to climate change in this region may lead to the change of regional stand dynamics and pattern under climate change. Therefore, the research on radial growth-climate relationship of multiple tree species is helpful to correctly reflect the forest dynamics. The results of this study can provide theoretical basis for regional forest management and ecological protection.