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
文献类型：学位论文
| 作者 | 石冰冰 |
| 答辩日期 | 2017-05-01 |
| 文献子类 | 硕士 |
| 授予单位 | 中国科学院大学 |
| 授予地点 | 新疆乌鲁木齐 |
| 导师 | 于瑞德 |
| 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 |
| 学位专业 | 理学硕士 |
| 英文摘要 | 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. |
| 学科主题 | 自然地理学 |
| 语种 | 中文 |
| 源URL | [http://ir.xjlas.org/handle/365004/14895]  |
| 专题 | 新疆生态与地理研究所_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 |
| 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. |
入库方式： OAI收割
来源：新疆生态与地理研究所
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