树木年轮记录的辽河平原南部240年以来10~6月的降水变化  被引量:2

A TREE-RING RECORDED OCTOBER-JUNE PRECIPITATION IN SOUTHERN LIAOHE RIVER PLAIN DURING THE PAST 240 YEARS

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作  者:陈振举[1,2] 白学平[1] 李俊霞[1] 张先亮[1] 李露露[1] 常永兴 

机构地区:[1]沈阳农业大学林学院、树木年轮实验室/辽河平原森林生态系统定位研究站,沈阳110866 [2]中国科学院清原森林生态系统观测研究站,沈阳110164

出  处:《第四纪研究》2015年第5期1165-1174,共10页Quaternary Sciences

基  金:国家自然科学基金项目(批准号:41271066和31100327)和沈阳农业大学“天柱山学者”计划项目共同资助

摘  要:利用油松(Pinus tabulaeformis)的树木年轮宽度年表,在相对湿润的辽河平原南部,重建了该地区1774年以来10~6月的降水变化.重建方程可以解释该地区实际降水量变化的39.9%.重建结果表明,在1774~2010年的过去约240年里,研究区经历了11个相对湿润期(1774~1795年、1809~1810年、1822~1823年、1835~ 1850年、1867~1874年、1889~1894年、1907~1914年、1931~1956年、1973~1976年、1985~1991年、2006~2010年)和10个相对干旱期(1796~1808年、1811~ 1821年、1824~ 1834年、1851~1866年、1875~1888年、1895~ 1906年、1915~1930年、1957~1972年、1977~1984年、1992~ 2005年),其中最湿润年份是1788年,最干旱年份是1859年.该地区降水以高频变化为主,存在准2.0~2.2年、2.4年,3.1~3.2年和3.7~3.8年的显著周期(p<0.05),其中准2.1年和准2.4年的周期达到极显著水平(p<0.01).重建的降水序列还存在50~70年左右的准周期.研究区10~6月的降水受东亚季风的影响,东亚冬季风强或夏季风弱,降水量均少,东亚冬季风弱或夏季风强,降水量则偏多.The study area is in the southern part of Liaohe-River plain, which has a temperate continental monsoon climate: it is cold and dry in winter, and warm and wet in summer. According to the technology of dendrochronology, a total of 233 cores ( 1 to 3 cores per tree) were taken from 126 Pinus tabulaeformis trees from two sites: Qianshan (41°11′23″N, 123°08′01″E; 520m a.s.l.; 70 trees/136 cores), which belongs to semi-humid region with exuberant vegetation), and Ltishan (41°36′35″N, 121 °41′42″E ; 415m a.s.l. ; 56 trees/97 cores) is located at a semi-arid area with less vegetation as compared to Qianshan. The crossdating was checked using COFECHA after dried, mounted, surface sanded, corssdated and ring width measured (with a precision of 0.01mm ) process. Using the program ARSTAN, three kinds of chronologies (Standard chronology, STD, Residual chronology, RES, and ARSTAN chronology, ARS) of two sites were developed respectively. The regional climate data developed by using the arithmetical average of climatic data from 9 meteorological stations record the monthly mean temperature and precipitation near the sampling sites. Correlation analysis shows that the radial growth from two sites negatively correlate to the spring and summer temperatures. Compared to the temperature, precipitation has more significant effects on the pine's radial growth. Specifically, tree ring from Qianshan has positive correlations with precipitation in February, May (p〈0.05) , and in April (p〈0.01). Tree ring from LUshan positively correlated to the precipitation in previous September and current February, May and July (p〈0.05) , especially in current September (p〈0.01). The October-June precipitation since 1774 was reconstructed using Chinese pine tree rings to explore regional moisture variations in southern Liaohe river plain. The reconstruction can explain 39.9% of the total variance of actual records. The reconstruction shows eleven persistent wet periods:

关 键 词:油松 树木年轮 气候变化 降水重建 东亚季风 

分 类 号:P467[天文地球—大气科学及气象学] P534.632

 

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