| 摘要: |
| 【目的】研究不同海拔太白红杉年轮宽度序列对气候变化的响应。【方法】以太白红杉为研究对象,在太白山同一坡向、不同海拔（3 100,3 200,3 300和3 400 m）分别设立样地,用生长锥法在树高1.3 m处钻取木芯,经晾干、打磨后，使用WinDENDROTM年轮分析系统进行轮宽测量和交叉定年,并分别建立各海拔年表；利用相关分析及响应分析统计方法,对年轮与气候因子的相关性及响应函数解释量进行研究。【结果】最高海拔4号样地与其他样地的相关性分析结果存在较大差异。当年生长季（3，4，6，7月）温度与1，2，3号样地太白红杉年轮指数序列均呈正相关,而与4号样地呈负相关；当年生长季（3，4，7月）降水量与1，2，3号样地年轮指数序列均呈负相关（4月份3号样地除外）,而与4号样地呈正相关。由响应函数分析可知，低海拔采样点1号样地，气象要素（温度和降水量）在响应函数解释量中所占的比重较高；但与降水量相比，高海拔林线采样点4号样地温度的解释量明显较大。【结论】太白红杉林最高海拔样地年轮指数序列变化与其他样地有明显差异；在响应函数分析中，气候要素对最低海拔样地年表贡献率最大，但最高海拔太白红杉生长对温度表现出较强的敏感性。 |
| 关键词: 太白红杉 海拔梯度 年轮宽度 气候变化 |
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| 基金项目:国家科技支撑计划项目(2007BAC03A02-06-03);林业公益性行业科研专项（200804010） |
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| Characteristics of ring width chronologies of Larix chinensis and their responses to climate change at different elevations in Taibai Mountain |
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| Abstract: |
| 【Objective】This research was to explore the responses of tree ring width of Larix chinensis at different altitudes in Taibai Mountain to climate change.【Method】L.chinensis was chosen as sample tree and sampling sites were set up at the same direction of slope in different elevations (3 100,3 200,3 300,3 400 m).Samples were collected at the height of 1.3 m of sample trees and then dried,polished and analyzed by Tree Ring Analysis System WinDENDROTM 2005a were done to measure the ring width,cross dating and establishing chronology in various altitudes;through correlation analysis and response function analysis, the responses of Taibai Alpine L.chinensis rings on the climate and the variable of Response Function were studied.【Result】 The result showed that there were differences between plot No.4 at the highest altitude and other plots (No.1,2 and 3).The temperature of March,April,June and July in current year positively was related with tree ring index series of plot No.1,No.2 and No.3 while negatively related with plot No.4;in addition,there was a negative relation between the precipitation of March,April,July in current year and tree ring index series of plot No.1,2,3 while there was a positive relation between the precipitation of March,April,July in current year and tree ring index series of plot No.4.Response Function analysis indicated that the variable of Response Function on the climate elements (temperature and precipitation) at plot 1 of the lowest altitude took the largest proportion within the research plots,while,compared with the precipitation,the variable of Response Function on the temperature at plot 4 of the highest was much bigger.【Conclusion】There is a significant difference about the variation of ring width index between the highest altitude and other elevations.Through Response Function analysis,the contribution rate of climatic factors to chronological tables of the lowest altitude reaches the peak value,but for the highest within research plots,the growth response of L.chinensis on temperature is much more sensitive than precipitation. |
| Key words: Larix chinensis altitude gradient ring width climate change |
