滇西北哈巴雪山不同海拔长苞冷杉径向生长对气候变化的响应

Response of Radial Growth of Abies georgei to Climate Change at DifferentAltitudes in Haba Snow Mountain, Northwestern Yunnan Plateau

全球气候变化背景下森林生态系统对气候的响应是被广泛关注的科学问题。以滇西北哈巴雪山为研究区,利用不同海拔长苞冷杉树轮宽度资料建立树轮宽度差值年表,并与气候因子进行分析,以揭示影响哈巴雪山不同海拔长苞冷杉径向生长的关键气候因子。结果表明:高海拔长苞冷杉主要受上年11月最高温和当年2月降水影响,低海拔树木主要受当年5月干旱限制,当年10月温度升高促进树木生长;低海拔树木径向生长与气候因子关系相对高海拔更加稳定,气候重建潜力更高。未来气候变化将有利于高海拔树木生长,低海拔树木可能会受到暖干气候的限制出现生长下降。

The response of forest ecosystems to climate under the global climate change is a scientific issue of wide spread concern.The Haba Snow Mountain in northwestern Yunnan was used as the study area.The chronologies were established by using the tree ring width data of Abies georgei at different altitudes,which were analyzed with climatic factors to reveal the key climatic factors influencing tree growth at different altitudes on Haba Snow Mountain.The results show that tree growth is mainly affected by the maximum temperature in November of previous year and precipitation in February of that year at high altitude.Trees at the low altitude are mainly restricted by the drought in May of that year,and the higher temperature in October can promote tree growth.The relationship between the tree radial grow that low altitude and climatic factors are relatively higher compared to high altitude,indicating that the trees at the low altitude has a higher potential for climate reconstruction.Future climate change will benefit tree growth at high altitude,while trees might be restricted by warm and dry climates at the low altitude.