华山树木年轮年表的建立

本文以秦岭东部的华山为例，论述了建立常规标准化、差值、自回归标准化这三种树木年轮年表的途径，指出了在半湿润地区利用这种途径建立树木年轮气候学年表的必要性，并进一步分析了三种年表对气候要素的响应及其差异。在取样环境较复杂的地点，建立多种年表有利于深入探讨气候要素与树木生长之间的关系，有推广的价值。

TREE-RING CHRONOLOGIES FOR PINUS ARMANDI FRANCH FROM HUASHAN, CHINA

The Huashan peaks at the eastern extreme of the Qinling Mountains are located in semi-humid area in China. Well replicated tree-ring increment cores were sampled for Pinus armandi Fanch from the Huashan peaks in 1990. Since most of trees sampled grow in stands where there is competition for sunlight, water,and mutrients and Huashan peaks have been a scenic spot, effects of competitation and release from competition with neighboring trees and human disturbances may exist in ring width variations.In order to minimize these non-climatic disturbances from treering data,other two ring-width chronologies called autoregressive standard chronology (ARS)and redisual chronology (RES) have been developed besides the general standard chronology (STD) .Comparison of chronology statistics among these three chronologies indicats that their phasesand amplitudes of high-frequency variation are quite similar, while the amplitudes of low-frequency variation are different. With the highest first-order autocorrelation coefficient and the lowest mean sensitivity among these three chronologies, STD containsmore low-frequency fluctuations.By contrast with STD,RES reflects the high-frequency variations. Common inteval analysis on de-trended series and residual series for AD 1676-1989 (l7 trees 25 radii) implies RES contains more climatic signal than STD does. Correlation analysis between chronologies and May and June precipitaion observed on Huashan Meteorological station also indicates that RES can represent the climatic variations better than STD does.In conclusion,the residual chronology contaions more information on climte change thah the original standard chronology. Thus, for semi-humid area where there is competition developing new chronologies would benefit dendroclimatic study in China.