不同径级油松径向生长对气候的响应  

Growth response to climate in Chinese pine as a function of tree diameter

作　　者：姜庆彪[1] 赵秀海[1] 高露双[1] 王晓明[1] 王雨茜[1] 

机构地区：[1]北京林业大学,北京100083

出　　处：《生态学报》2012年第12期3859-3865,共7页Acta Ecologica Sinica

基　　金：林业公益性行业科研专项基金(200904022);"十二五"国家科技支撑课题(2012BAC01B03);北京市共建项目专项资助(2011)

摘　　要：建立了黑里河自然保护区油松年轮宽度年表,通过不同径级油松径向生长对逐月气候因子的响应关系,研究了干旱对不同径级油松径向生长的影响。结果表明:两个径级油松的年轮宽度指数达到极显著相关(R=0.943,P<0.01),其中小径级(平均胸径20 cm)油松年表的平均敏感度显著高于大径级(平均胸径43 cm)油松年表(P<0.01)。不同径级油松均与上年9月、当年2月及当年5—6月的降水显著正相关(P<0.05),与当年6月的平均温度显著负相关(P<0.05),此外,小径级油松还与当年7月的降水显著正相关(P<0.05);降水是影响油松生长的主要气候因子。不同径级油松的径向生长量在干旱年份均显著降低(P<0.01)且小径级油松的生长降低量显著高于大径级油松(P<0.01);不同径级油松生长量在干旱发生后1年左右的时间内均恢复正常且小径级油松恢复速度更快。Tree growth response to climate change in most dendrochronological studies are usually analyzed using dominant trees in a stand.However,trees′ climate-growth relationship changes in tree size,which may affect tree growth response to climate change.We built 31 tree-ring chronologies of Pinus tabulaeformis in Heilihe natural preservation areas to represent two groups of trees： dominate trees（N=15,mean diameter=43 cm） and suppressed trees（N=16,mean diameter=20cm）.We analyzed differences in climate-growth relationships between two groups of trees and then discussed whether drought differentially affected the ring-widths in these groups.Climate-growth relationships were analyzed using the correlation and response functions and the effect of drought on tree growth was evaluated by superposed epoch analysis（SEA） using nine drought years.For SEA analyses,five years prior to drought and five years following a drought year were considered.The mean sensitivity of suppressed trees were significantly higher than dominant trees（P〈0.01）,meanwhile the signal-noise ratio and the variance in first eigenvector were much higher in suppressed than in dominant trees.Ring width indices of two chronologies were highly correlated（R=0.943,P〈0.01） while the raw ring widths were significantly different（P〈0.001）.The ring-widths of all trees were significant positive correlated to precipitation of February,May,June and September of the previous year（P〈0.05）.Growth of suppressed trees was positive correlated to precipitation of July（P〈0.05）.The ring-widths of all samples were positively correlated to spring temperature and negatively correlated to summer temperature.Growth of all trees was significantly and negatively correlated to monthly mean temperature of June（P〈0.05）.Dominant trees were more sensitive to climate during the previous year while suppressed trees were more sensitive to weather during the current year.In general,June was the most influential month.Precipitation appeared to be

关 键 词：黑里河 油松 年轮生态学 干旱 

分 类 号：S791.254[农业科学—林木遗传育种]