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天山东部雪岭云杉和西伯利亚落叶松径向生长对气候变化的响应
石冰冰
学位类型硕士
导师于瑞德
2017-05-01
学位授予单位中国科学院大学
学位授予地点新疆乌鲁木齐
学位专业理学硕士
关键词天山东部 雪岭云杉 西伯利亚落叶松 树木年轮 气候响应 eastern Tianshan Mountains Picea schrenkiana Larix sibirica tree-ring climate response
摘要In this study, tree-ring cores (Picea schrenkiana and Larix sibirica) were obtainedfrom three sites, ranging from the upper and lower forest border in the eastern section ofthe Tianshan Mountains, northwestern China. The RES chronologies for three sites wereapplied in the study. Response relationship between RES chronologies and monthlyprecipitation, average temperature, season indicators were analyzed using the data fromBalikun meteorological stations. The primary results are: (1) The sensitivity of two tree species to climate changes with altitude was decreased,correlation coefficient (R1, R2), signal-to-noise ratio (SNR), express population signal(EPS) and the percentage variance of the first eigenvalue (PC1) were firstly decreased andthen increased with increasing altitude. The significant positive correlations in the original,low-frequency and high-frequency domain between two tree species on the same altitude,while the chronologies of low and high have few common variations. The correlationbetween HM2Y and average temperature and precipitation is weakened. (2) The results show that between 1957-1984 and 1985-2013, tree ring widths in thedifferent altitude behaved a different response to the change of mode to environmentalfactors under changing climate. At the higher elevations, there was a stronger influence ofclimate on tree growth in Picea schrenkiana during the period 1985-2013 with increasingtemperature than during 1957-1984 with decreasing temperature. The negative response ofthe lower altitude chronology (HM3Y) to the temperature is enhanced and the positiveresponse to precipitation is enhanced. (3) The relationship between Larix sibirica radial growth and climatic factors indifferent elevations also changed between 1957-1984 and 1985-2013. The correlationbetween the low altitude (HM3L) chronology and the climatic factors at two periods issignificantly different. After rapid warming (1985), the relationship between the radialgrowth of Larix sibirica and the temperature and precipitation was significantly reduced.At 2430m a.s.l., the tree growth did not show any significant relationship with precipitationand temperature during 1957-1984, but it was found to be significantly correlated with climate factor during 1985–2013. The high temperature (HM1L) chronology has asignificant negative correlation with the three temperature indices in December last year,and the positive response to precipitation is enhanced. (4) The response of Picea schrenkiana and Larix sibirica at different altitudes toclimate factors are quite different. On the upper limits site (2700m a.s.l.) in TianshanMountains, radial growth of Picea schrenkiana was positively correlated with precipitationof previous July and current October, and positively correlated with temperature of currentApril, June and July. However, the tree-ring width of Larix sibirica was positivelycorrelated with the precipitation in March. On the mid-elevation sites (2430m a.s.l.), radialgrowth of Picea schrenkiana was negatively to temperature of previous August. In contrast,Tree-ring growth of Larix sibirica was positively correlated with temperature in currentJuly and August. On the lower limits site (2160m a.s.l.), tree growth of Picea schrenkianawas mainly controlled by drought and high temperature. However, tree-width of Larixsibirica was mainly controlled by high temperature in June of the current year as well as bythe lack of water in December of the preceding year and January of the current year. (5) Redundancy analysis between six chronologies and climate factors showed thesimilar results as that of the correlation analysis. Therefore, the development trend of warmclimate is conducive to the growth of trees at high-altitude. However, drought stress on thegrowth of trees at the altitude and low altitude may be intensified.
其他摘要树木径向生长同时受自身遗传因素与外部环境条件的制约。极端环境(如高山林线、高纬度地区等)树木生长对气候环境变化反应更为敏感,因此关于树木生长与气候变化关系的研究受到广泛关注。本文运用树木年代学的方法,以西伯利亚落叶松(Larix sibirica)和雪岭云杉(Picea schrenkiana)为研究对象,探讨天山东部地区不同海拔树木生长与气候之间的响应关系。主要结果归纳如下: (1)随着海拔的升高,雪岭云杉和西伯利亚落叶松树轮宽度年表的相关系数(R1,R2)、信噪比(SNR)、样本的总体代表性(EPS)和第一特征向量百分比(PC1)等参数均呈先降低再升高的变化趋势。树木对环境变化的敏感性降低。相同海拔高度上的年表在全频域和低频域上呈显著正相关,而海拔差距较大的低海拔年表与高海拔年表相关性均不显著。 (2)不同海拔雪岭云杉生长与气候要素的响应关系在 1957~1984 年和 1985~2013年时段均出现了变化。随着气温升高,高海拔年表(HM1Y)对气温和降水的正响应增强;中海拔年表(HM2Y)与气温和降水的相关性减弱;而低海拔年表(HM3Y)对气温的负响应增强,对降水的正响应加强。 (3)不同海拔西伯利亚落叶松生长与气候要素的关系在 1957~1984 年和1985~2013 年时段也出现了改变。低海拔年表(HM3L)在快速升温(1985 年)后,树木年轮生长与降水和温度的相关性明显减弱;中海拔年表(HM2L)在 1957~1984年时段内与降水和温度的关系均较弱,到 1985~2013 年,气候因子对中海拔树木径向生长的限制作用随着气候变暖而增强;高海拔(HM1L)年表与上年 12 月 3 个温度指标由正相关转为显著负相关,对降水的正响应增强。 (4)树木生长与气候要素的响应关系随着海拔的变化而改变。高海拔雪岭云杉主要受上年生长季降水不足和生长季时期低温的限制,相对应的西伯利亚落叶松主要受当年 3 月降水量的影响;中海拔雪岭云杉主要受上年 8 月高温的影响,同一海拔西伯利亚落叶松主要受当年 7~8 月高温的限制;低海拔雪岭云杉主要受高温和干旱的共同限制,相对应的西伯利亚落叶松主要受生长季前期降水不足和 6 月高温的影响。 (5)雪岭云杉和西伯利亚落叶松年表与气候因子的冗余分析(redundancy analysis, RDA)与相关函数分析的结果基本一致,7 月气温对天山东部树木生长的影响最大。因此,气候变暖的趋势有利于天山东部高海拔雪岭云杉和西伯利亚落叶松树木的径向生长,而中、低海拔的雪岭云杉和西伯利亚落叶松生长的干旱胁迫有可能会进一步加剧。
学科领域自然地理学
语种中文
文献类型学位论文
条目标识符http://ir.xjlas.org/handle/365004/14895
专题研究系统_荒漠环境研究室
作者单位中国科学院新疆生态与地理研究所
第一作者单位中国科学院新疆生态与地理研究所
推荐引用方式
GB/T 7714
石冰冰. 天山东部雪岭云杉和西伯利亚落叶松径向生长对气候变化的响应[D]. 新疆乌鲁木齐. 中国科学院大学,2017.
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