湖北神农架巴山冷杉径向生长对气候的响应  

Growth response of Abies fargesii to climate in Shennongjia Mount of Hubei Province,Southeastern China

作　　者：侯鑫源 史江峰[1,2] 李玲玲[1] 鹿化煜[1,2] 

机构地区：[1]南京大学地理与海洋科学学院,南京210023 [2]江苏省气候变化协同创新中心,南京210023

出　　处：《应用生态学报》2015年第3期689-696,共8页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(41271210);全球变化研究国家重大科学研究计划项目(2010CB950104);中央高校基本科研业务费项目;江苏高校优势学科建设工程项目;国家留学基金项目资助

摘　　要：利用湖北神农架巴山冷杉树轮宽度标准年表,研究其径向生长对气候要素(月平均气温和月降水量)和生长期其他参数(活动积温、持续天数、初日和终日)的响应.结果表明:神农架地区巴山冷杉径向生长与当年2、4和9月平均气温呈显著正相关,与上年和当年9月降水量呈显著负相关,与上年12月降水量呈显著负相关.巴山冷杉径向生长与生长期活动积温和持续天数呈正相关,且与以9.0℃为阈值定义的活动积温和持续天数的相关最高.其生长期从5月下旬开始,到9月中旬结束,大约120 d.树轮宽度标准年表与以9.0和9.3℃定义的生长期初日和终日序列相关最高,相关系数分别为-0.25(接近0.05显著性水平)和0.33(P<0.05),所以9.0℃是其进行光合作用的敏感温度.生长期开始得早或结束得晚,即生长期延长,均有利于巴山冷杉的生长.与我国气候突变年(1978年)前相比,1978年以后神农架地区气温开始上升,生长期活动积温和持续天数开始增加,生长期初日提前,终日延迟,使得生长期延长,进而促进了巴山冷杉的径向生长.A well-replicated Abies fargesii tree-ring width chronology in the Shennongjia Mount was developed to investigate its radial growth response to climate variables（ e.g.,monthly mean temperature and total precipitation） and other growing season indicators（ e. g.,cumulative temperature,continuous days,initial and final dates）. Correlation analyses showed that the tree-ring width was positively correlated to the mean temperatures of February,April and September,and negatively correlated to the total precipitation of September,prior September and prior December. The analyses between the chronology and other growing season parameters showed that tree growth responded positively to the cumulative temperature and continuous days of the growing season. The correlation was the highest when the growing season was defined as the days above the temperature threshold of 9.0℃. Defined this way,the growing season typically started in late-May and ended in mid-September,lasting about 120 days. Correlation analyses were also conducted between the tree-ring growth and the initial and final dates of the growing season. Results showed that correlation was the highest for initial dates defined at 9.0 ℃（ with the coefficient of-0.25 and p-value close to 0.05）,and for final dates defined at 9.3 ℃（ with the coefficient of 0.33 and p-value less than 0.05）. All these results indicated that the sensitive temperature threshold for photosynthesis of A. fargesii was around9.0 ℃. The year 1978 marked an abrupt shift of climate in southeast China. We compared A. fargesii growth between pre-1978 and post-1978 periods. Results showed that as temperature rose,the growing season was lengthened with both earlier initial dates and later final dates. Longer growing season increased the A. fargesii growth in the Shennongjia Mount,southeastern China.

关 键 词：神农架 巴山冷杉 树轮宽度 气候响应 生长期 

分 类 号：S791.14[农业科学—林木遗传育种]