Zhao Zhi-Jiang, Tan Liu-Yi, Kang Dong-Wei, Liu Qi-Jing, Li Jun-Qing
Ministry of Education Key Laboratory for Silviculture and Conservation, College of Forest Science, Beijing Forestry University, Beijing 100083, China.
Ying Yong Sheng Tai Xue Bao. 2012 Mar;23(3):603-9.
Picea likiangensis (Franch. ) Pritz. primary forest is one of the dominant forest types in the Small Zhongdian area in Shangri-La County of Yunnan Province. In this paper, the responses of P. likiangensis tree-ring width to climate change were analyzed by dendrochronological methods, and the dendrochronology was built by using relatively conservative detrending negative exponential curves or linear regression. Correlation analysis and response function analysis were applied to explore the relationships between the residual chronology series (RES) and climatic factors at different time scales, and pointer year analysis was used to explain the reasons of producing narrow and wide rings. In the study area, the radial growth of P. likiangensis and the increasing air temperature from 1990 to 2008 had definite 'abruption'. The temperature and precipitation in previous year growth season were the main factors limiting the present year radial growth, and especially, the temperature in previous July played a negative feedback role in the radial growth, while the sufficient precipitation in previous July promoted the radial growth. The differences in the temperature variation and precipitation variation in previous year were the main reasons for the formation of narrow and wide rings. P. likiangensis radial growth was not sensitive to the variation of PDSI.
丽江云杉（Picea likiangensis (Franch.) Pritz.）原始林是云南省香格里拉县小中甸地区的主要森林类型之一。本文采用树木年轮学方法分析了丽江云杉年轮宽度对气候变化的响应，并利用相对保守的去趋势负指数曲线或线性回归建立了树木年轮年表。应用相关分析和响应函数分析，探讨了残差年表序列（RES）与不同时间尺度气候因子之间的关系，并采用指示年分析来解释产生窄环和宽环的原因。在研究区域，1990年至2008年丽江云杉的径向生长与气温升高存在明显的“突变”。前一年生长季的温度和降水是限制当年径向生长的主要因素，特别是前一年7月的温度对径向生长起负反馈作用，而前一年7月充足的降水则促进径向生长。前一年温度变化和降水变化的差异是形成窄环和宽环的主要原因。丽江云杉径向生长对标准化降水蒸散指数（PDSI）的变化不敏感。
