神农山白皮松不同龄组年轮-气候关系及PDSI重建  

A tree-ring record of 1920's—1940's droughts and mechanism analyses in Henan Province

作　　者：彭剑峰[1] 刘玉振[1] 王婷[2] 

机构地区：[1]河南大学资源与环境研究所环境与规划学院,开封475004 [2]河南农业大学林学院,郑州450002

出　　处：《生态学报》2014年第13期3509-3518,共10页Acta Ecologica Sinica

基　　金：国家自然基金资助项目(31270493);河南省教育厅自然科学基金资助项目(2011B170003)

摘　　要：对比来自河南省神农山的不同年龄组白皮松树轮宽度年表特征值,发现敏感性都较高,表明树轮中含有较多的气候信息;树木越老敏感性越大但标准差也越大,幼龄树敏感性降低但信噪比(SNR)和样本总体解释量(EPS)都较老龄树大;整个组的信噪比(SNR)和样本总体解释量(EPS)高于各个年龄组。与气候因子相关结果表现出幼树和老树受温度的限制作用要强于中龄树(尤其是当年5月);树木生长模型显示其方差解释量为53.7%,调整后为48.3%,都通过99.9%的显著检验,表明当年5月和前一年9月的水热组合是树木生长的主要限制因子。各轮宽年表与前一年11月至当年10月的PDSI的相关均明显高于与各月PDSI的相关值,表明水热年组合的影响强于各月的水热组合。利用整个采样点样本建立的树轮宽度标准年表重建的1805—2005年时段的PDSI序列明显凸现出20世纪20—40年代研究区为严重的干旱期;多窗谱分析也表明,神农山地区存在2.3—5.1a、36.6a和78.7a的准周期,其中2.7a、2.8a和78.7a准周期最显著。这些周期性干湿变化可能与太阳活动、季风和ENSO的变化存在一定的关系。We found that the tree rings have higher mean sensitivity（ MS） via comparisons among tree-ring width chronologies of Pinus bungeana in different age-class from Shennong Mountains in Henan Province. The MS is standard deviation（ SD） particularly high for the older trees. While the signal-to-noise ratio（ SNR） and expressed population signal（ EPS） for the young trees are higher than these of the older age-class trees. The SNR and EPS of the entire age-class is higher than individual age-class. We investigated the climate-growth responses for chronologies at different age-classes. It is revealed that there are some different responses to temperature and limiting influence to the younger age-class and the older age-class trees are more than the middle age-class trees（ especially in current May）. The tree-ring chronology explained53. 7% and 48. 3% of the instrumental variances of the mean temperature and precipitation in current May and previous September. This indicates that the correlation with temperature and precipitation of current May and previous September is the main limiting factor of growth of trees.The higher correlation between chronology and PDSI from previous November to current October than that to each month PDSI indicates that the correlation with temperature and precipitation during a year is stronger than that of individual month. The result of PDSI reconstructed from 1805 to 2005 a of all Pinus bungeana shows there lies a serious drought period from 1820＇s to 1840＇s. Significant multidecadal spectral peaks of 2. 3—5. 1a、36. 6a and 78. 7a were identified,and 2. 7a,2. 8a and 78. 7a were most significant with 0. 01 level. The periodic variation of dry and wet may potentially be the fingerprints of some climate change forcings such as solar activity,summer monsoon and ENSO activity.

关 键 词：神农山 白皮松 树木年轮宽度 PDSI 重建 

分 类 号：S791.243[农业科学—林木遗传育种]