中国落叶松属树木年轮生长特性及其对气候变化的响应

来源 :中国科学:地球科学 | 被引量 : 0次 | 上传用户:fengyes888
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作为树轮气候学中的传统研究树种,落叶松属树木已被广泛认同可以敏感反映气候的变化.本研究用树轮气候学的方法,对中国落叶松属9种1变种树木年轮采集了11个样点,对样本树轮宽度指标进行了基本统计特征的分析,合成了8种1变种的10条树轮宽度差值年表序列,并分别与相应采样区的区域气候资料距平平均序列进行了Pearson相关分析,将不同地区的不同落叶松树种树轮生长与气候因子的变化进行比较,在较大空间范围内探讨落叶松属树木对气候响应的规律.结果显示,季风边缘带的多数样点与5月平均气温及平均最高气温存在显著的正相关关系,春季温度对落叶松属树木年轮生长有显著的影响,降水并未成为其限制因子;西藏吉隆的喜马拉雅落叶松平均年轮宽度最大,四川泗耳沟采集的四川红杉平均年轮宽度最小,这两种落叶松的年轮宽度变化所含气候信息较少;太白红杉、红杉、西藏红杉对气候变化较敏感,具有气候重建的潜力,海拔是影响落叶松树轮对气候因子响应的重要因素. As a traditional tree species in tree climatology, larch trees have been widely accepted to sensitively reflect changes in climate.In this study, tree-ring climatology was used to collect 9 species and 1 tree species of larch 11 sampling points were used to analyze the basic statistical characteristics of the tree width index of the sample and 10 chronological sequences of tree width differences of 8 species and 1 varieties were synthesized and compared with the average of regional climatic data of the corresponding sampling areas Pearson correlation analysis was used to compare the tree ring growth and climatic factors of different larch species in different regions and to explore the response of larch trees to climate in a large spatial range.The results showed that the monsoon zone There was a significant positive correlation between most samples and the average temperature in May and the highest average temperature. Spring temperature had a significant effect on the growth of larch tree rings, and precipitation did not become the limiting factor. The mean annual age of Himalayan larch The width of the wheel is the largest, and the average annual ring width of the sequoia of Sichuan collected in Soul Gulch in Sichuan is the smallest. The change of the width of the annual rings of these two larches contains less climate information. Sequoia, Sequoia, Sequoia Tibet is more sensitive to climate change has the potential to reconstruct climate and altitude are important factors larch tree ring response to climatic factors of influence.
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