天山云杉树木年轮宽度对气候因子变化的响应

Response Analysis Between Tree-Ring Widths and Climatic Factors Along Different Regions in Tianshan Mountains Northwestern China

利用取天山山脉中国境内东西中部3个地区的天山云杉树木年轮样本,运用树木年轮气候学的方法,分析了树木生长与降水和气温两个气候因子之间的关系.采用树木年轮分析的常规程序,对样芯进行黏贴、打磨、测量宽度,利用COFECHA程序进行了交叉定年,然后运用ARSTAN程序建立了3个地区的树轮年表,并用PRECON程序进行了相关分析和响应函数分析.结果表明:3个地区的树木生长同时受降水和气温的综合影响,并呈规律性变化,从西部到东部,树木生长对降水因子的响应程度越来越弱,且由负相关变化到正相关;对温度因子的响应程度越来越强,且由正相关变化到负相关.通过对同一纬度不同地区树木生长的研究,发现了在气候变化条件下树木生长与主要气候因子响应关系的异同,这一结果将为进一步研究整个新疆地区的气候变化提供了依据.

The relationships between tree-ring widths and two climate factors were investigated with tree cores of picea schrenkiana collected in Tianshan Mountains （China） as samples by dendroclimatic methods. According to the normal process of tree-ring analysis, tree chronology was attained using the software PRECON to acquire the relationships between treering widths and climatic variables including temperature and precipitation after crossdating these samples by COFECHA program and ARSTAN program. The results show that there are significant correlations between tree growth and two climatic factors in three regions. The sensibility of tree growth responsing to precipitation factor turns weaker from the west to the east, and the tree-ring widths responsing to precipitation are from negative correlation to positive correlation. The response turns from positive relation to negative relation and the degree gets stronger for temperature factor. Based on studies of the fundamental relationships between tree growth and climatic factors in different regions, the relationships between tree-ring widths and climatic factors were found, which could be attributed to the further research in the whole region.