植物生态学报 ›› 2011, Vol. 35 ›› Issue (7): 707-721.DOI: 10.3724/SP.J.1258.2011.00707

• 研究论文 • 上一篇    下一篇

不同去趋势方法对树轮年表气候信号的影响——以卧龙地区为例

李宗善1, 刘国华1,*(), 傅伯杰1, 张齐兵2, 胡婵娟1, 罗淑政1   

  1. 1中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085
    2中国科学院植物研究所植被与环境变化国家重点实验室, 北京 100093
  • 发布日期:2011-08-18
  • 通讯作者: 刘国华
  • 作者简介:*E-mail: ghliu@rcees.ac.cn

Influence of different detrending methods on climate signal in tree-ring chronologies in Wolong National Natural Reserve, western Sichuan, China

LI Zong-Shan1, LIU Guo-Hua1,*(), FU Bo-Jie1, ZHANG Qi-Bing2, HU Chan-Juan1, LUO Shu-Zheng1   

  1. 1State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing 100085, China
    2State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
  • Published:2011-08-18
  • Contact: LIU Guo-Hua

摘要:

基于川西卧龙地区林线位置岷江冷杉(Abies faxoniana)的树轮宽度数据, 结合地面气象站和空间网格化气象数据, 对不同去趋势年表对气候条件的响应特征进行了比较分析。研究表明: 不同去趋势年表的气候响应特征具有很大的相似性, 具体表现为前一年9月份、当年3月份和7月份的气温, 以及前一年10-12月份的降水、当年4月份和7月份的降水对树木生长的正影响作用; 前一年11月份到当年3月份的相对湿度, 以及当年2-3月份和7-8月份的霜冻频率对树木生长的负影响作用。从不同去趋势方法对气候响应的异质性特征来看, 保守曲线、67%样芯长度步长、60年步长和90年步长的平滑样条函数去趋势年表间具有很强的相关性, 对气候响应也最明显, 特征基本一致。30年步长的平滑曲线去趋势年表与其他去趋势年表的相关性较弱, 与气候要素的相关性也明显较小。另外, 未经去趋势处理的树轮宽度年表统计参量数值要明显高于去趋势年表, 它与气候要素的相关特征也基本反映出川西卧龙地区树木生长对气候响应的基本特征。

关键词: 气候响应, 去趋势方法, 树木年轮, 川西, 卧龙自然保护区

Abstract:

Aims Tree rings are valuable for paleoenvironmental studies; however, the methods by which tree-ring series are processed are controversial. Our objective is to assess the impacts of different tree-ring detrending methods on climate-growth response patterns in Wolong National Natural Reserve, western Sichuan, China.
Methods Fifty-four increment cores were taken from living trees of Abies faxoniana at a treeline site (3 450 m). We standardized tree-ring data with systematic growth forcing by five methods: conservative curve fits, 67% of series length and fixed 30 years, 60 years and 90 years cubic smoothing splines, and the resulted chronologies are abbreviated as CCF, CSS67%, CSS30, CSS60 and CSS90, respectively. We also composed the original tree-ring-width chronology (ORW) without standardization. Tree ring chronologies were correlated against (a) monthly climate data (mean, minimum and maximum temperatures, precipitation and relative humidity) from the nearby meteorological station and (b) monthly climate data (mean, minimum and maximum temperatures, precipitation and frequency of frost) from a high resolution gridded climate dataset.
Important findings In spite of differences in the strength of growth-climate correlations among the chronologies, a similar linear response was the dominant mode. Radial growth was positively correlated with temperature in September of the prior year and March and July of the current year, as well as precipitation in October-December of the prior year and April and July in the current year. In contrast, radial growth was negatively correlated with relative humidity in November of the prior year and March of the current year, as well as frequency of frost in February-March and July-August of the current year. Of the climatic response patterns for different chronologies considered, CCF, CSS67%, CSS60 and CSS90 chronologies had average higher inter- correlations and the strongest climate signals. In contrast, CSS30 chronology exhibited weaker correlations with other chronologies, and showed a similar, albeit much lower sensitivity to climate. ORW chronology had the highest statistical values among the chronologies and could provide valuable climate information for tree-ring studies.

Key words: climate response, detrending method, tree-ring, western Sichuan, Wolong National Natural Reserve