秦岭牛背梁自然保护区巴山冷杉(Abies fargesii)树轮宽度对气候变化响应的分离效应  

Response divergence of Abies fargesii tree-ring widths to climate variation in the Niubeiliang Nature Reserve of the Qinling Mountains

作　　者：高娜[1] 李书恒[1] 白红英[1] 王俊[1] 

机构地区：[1]西北大学城市与环境学院,西安710127

出　　处：《生态学杂志》2016年第8期2056-2065,共10页Chinese Journal of Ecology

基　　金：国家林业公益性行业科研专项(201304309);陕西省自然科学基金项目(2014JQ5172)资助

摘　　要：本文采用树轮气候学的方法,以1992/1993年为分界点,分析了两个时段(1969—1992年和1993—2013年)秦岭牛背梁自然保护区巴山冷杉的生长对气候要素响应的异质性特征。结果表明:研究区巴山冷杉的径向生长对温度的响应存在着一定的分离效应。将表征巴山冷杉径向生长的差值年表(RES)序列分别与年际、季节和月值气候要素进行相关和响应函数分析发现,在1969—1992年时段,巴山冷杉的径向生长与年际及季节的平均温度并未表现出显著的相关性,与当年3月、9月平均温度和当年2月、4月降水量显著负相关,与当年5月平均温度显著正相关;在1993—2013年时段,巴山冷杉的径向生长与上一个秋季的平均温度呈显著正相关,在月值气候要素的相关分析中,其与上年10月的平均温度呈显著正相关,与当年2月降水量仍显著负相关;同时,在两个时间段上,巴山冷杉的径向生长均与上一个冬季的平均降水量显著负相关。由此推断,伴随着全球气候变暖,秦岭牛背梁自然保护区巴山冷杉的径向生长在两个时间段对于气候要素的响应特征、响应模式存在着差异。The heterogeneity of response of tree-ring width of Abies fargesii to climate change in the Niubeiliang Nature Reserve of the Qinling Mountains was analyzed by dendroclimatological methods during periods of 1969-1992 and 1993-2013. The results showed that a divergence problem existed in the radial growth responses of A. fargesii to temperature indicators in the study area. The characterization of A. fargesii radial growth chronology series was explored by correla- tion analysis and response function analysis. During 1969-1992, the tree-ring widths of A. farge- sii did not correlate with the mean annual and seasonal temperature, but had significant negative correlations with the mean temperature of March and September and the precipitation of February and April in the current year. In addition, the tree-ring width of A. fargesii showed a significant positive correlation with the mean temperature of May in the current year. During the period of 1993-2013, the tree-ring widths of A. fargesii showed a significant positive correlation with the mean temperature of the previous autumn, especially in the previous October, while a negative correlation with the precipitation in February of the current year. Moreover, the tree-ring width of A. fargesii was negatively correlated with the average rainfall in the previous winter during the two periods. This study indicated that in the context of global warming, the responses of A. fargesii ra- dial growth to climatic variables were different in the two periods in the Niubeiliang Nature Re- serve of the Qinling Mountains.

关 键 词：树轮宽度 气候变化 分离效应 秦岭牛背梁自然保护区 

分 类 号：S791.14[农业科学—林木遗传育种]