| 摘要: |
| 【目的】研究鄂尔多斯中部地区未来气候环境的变化，探讨树木年轮生长与气候环境的响应关系。【方法】对鄂尔多斯中部地区油松（Pinus tabulaeformis）树木年轮样本进行了树轮密度指标的分析，结果表明，研究区树木年轮最大密度指标与树木生长期6-10月降水量有显著的正相关关系，相关系数为0.582（P0.001）。利用油松树木年轮最大密度指数，对研究区1888年以来6-10月的降水量变化进行了重建，重建序列方差解释量为0.339。【结果】重建结果分析表明，鄂尔多斯中部地区过去115年中有明显的干湿变化特征，降水较多的湿润时段有：1888-1896年、1903-1908年、1934-1953年、1984-1993年；降水较少的干旱时段有：1897-1902年、1920-1933年、1954-1958年、1994-2000年。功率谱分析表明，重建降水量变化序列有2年、7年以及11年左右的周期变化。【结论】该地区降水变化与区域气候变化相一致，降水变化可能受大尺度气候环境变化的控制与影响。 |
| 关键词: 油松 树木年轮 最大密度 降水量重建 |
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| 基金项目:国家自然科学青年基金项目“渭河流域气候及河川径流变化的树轮记录”（41102107）；国家自然科学重大基金项目“水文序列变异诊断和重构理论与方法”（51190093/E0901）；中国科学院黄土与第四纪地质国家重点实验室开放基金项目（SKLLQG0904，SKLLQG1017） |
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| Tree-ring density based precipitation reconstruction from -June to October in Central Ordos |
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| Abstract: |
| 【Objective】This study aimed to investigate the future change of climate and environment in Central Ordos,and study the correlation between climatic environment change and tree-ring growth.【Method】Tree-ring samples from Pinus tabulaeformis were collected in Central Ordos and analyzed by measuring tree-ring densities using X-ay densitometry.Tree-ring maximum density chronologies were found to be significantly correlated with precipitation in tree growing season from June to October with a coefficient of 0.582 (P>0.001).The chronology of maximum density was used to reconstruct the total precipitation from June to October during 1888-2002 with an explained variance of 0.339.【Result】In the past 115 years,there were 4 humid periods (1888-1896,1903-1908,1934-1953 and 1984-1993) and 4 arid periods (1897-1902,1920-1933,1954-1958 and 1994-2000).The power spectrum analysis indicated that precipitation from June to October had wave periods of 2-year,7-year and 11-year.【Conclusion】The climatic fluctuations of research area were identical to regional climate change and were controlled and influenced by large scale climatic and environmental changes.- |
| Key words: Pinus tabulaeformis tree rings maximum density precipitation reconstruction |
