芦芽山华北落叶松(Larix principis-rupprechtii)树轮宽度年表对气候因子的响应  

Climate-adial growth relationship of Larix principis-rupprechtii at different altitudes on Luya Mountain

作　　者：李颖俊[1,2] 王尚义[1] 牛俊杰[1] 方克艳[2] 李晓岚[3] 栗燕 布文丽 李玉晗 

机构地区：[1]太原师范学院汾河流域科学发展研究中心,晋中030619 [2]福建师范大学地理科学学院,福州350007 [3]陕西师范大学旅游与环境学院,西安710119 [4]河北沧州献县一中,沧州062250 [5]山西平遥香乐乡第二初级中学,晋中031100 [6]河北唐山丰润镇中学,唐山064001

出　　处：《生态学报》2016年第6期1608-1618,共11页Acta Ecologica Sinica

基　　金：山西省高等学校哲学社会科学研究项目(2011325);山西省软科学项目(2012041015-03;201204101502);国家自然科学基金项目(41171423)

摘　　要：在芦芽山地区采集3个不同海拔的华北落叶松(Larix principis-rupprechtii),在传统去趋势的基础上,采用"signal-free"方法对拟合曲线进行修正,避免了中等频率的气候信息引起的拟合偏差,最终建立3个不同海拔树轮宽度标准年表(STD)。同时以10a为界对上述年表进行滤波处理,得到3个低频年表。年表特征值表明,随着海拔升高,年轮平均轮宽变窄,敏感性和高频信息增强,低频信息减弱,这可能与逐渐恶劣的生境有关。中、低海拔年表的低频信息更一致,中、高海拔的高频信息更接近,而高、低海拔无论是标准年表还是高频、低频年表相似性均较差。树轮气候响应分析显示,低海拔STD年表与5月最低温负相关最为显著,STD和低频年表均与5、6月份土壤温度显著负相关,说明生境暖干,树木主要受生长季的干旱胁迫;中海拔STD年表与当年5月最高温正相关最为显著,STD和低频年表与土壤温度相关均不显著,说明生境逐渐变得冷湿,生长季的低温成为树木生长的限制因子;高海拔STD年表与气象要素相关不显著,低频年表与当年4月土壤温度正相关,说明高海拔最为冷湿,并有季节性冻土分布,生长季的土壤低温成为树木生长的限制因子。因此,全球变暖的趋势将更有利于高海拔树木的生长,而低海拔树木的干旱胁迫进一步加剧。Tree-ring samples were collected from Larix principis-rupprechtii trees at three sites at different altitudes on LuyaMountain,in the Shanxi Province of North Central China. We used a＂signal-free＂method to alleviate potential biases due to climate medium-frequency disturbances,and generated three standard（ STD） chronologies. The mean tree-ring width,first-order auto-correlation（ ac1）,and standard deviation（ SD） of the three chronologies decreased as the altitude increased,and the mean sensitivity（ MS）,absent rings percentage,and series inter-correlation（ r） increased with increasing altitude. The low-frequency and high-frequency chronologies were generated by applying low-pass（ f 0. 1037）and high-pass（ f 0. 1037） filters. Generally, the climate sensitivity and high-frequency variability of tree-ring chronologies increase with increasing altitude,while mean tree-ring widths and low-frequency variability were lower at high elevations. Low-frequency chronologies from middle and low altitudes exhibit less variation; while high-frequency chronologies from middle and high altitudes are similar to each other. The chronologies of high and low altitudes have few common variations. The correlation function and response function analyses were used to identify the key climate factor limiting the growth of trees at different altitudes. A significant negative correlation was observed between tree rings at low altitudes and the minimum temperature in May,while standard and low-frequency chronologies were significantly negatively correlated with soil temperatures in May and June. This indicates that trees at low altitudes experience drought stress due to the warm,dry climate. The STD chronology is most significantly positively correlated with the maximum May temperature,and significantly negatively correlated with the maximum April temperature at the middle altitude site,which has a relatively cold and wet climate. The relationship between chronology and soil temperature is not significant. High Ap

关 键 词：华北落叶松 海拔梯度 树轮气候响应 

分 类 号：S791.22[农业科学—林木遗传育种]