红花尔基樟子松径向生长对生长期温度的响应研究

Response of radial growth of Pinus sylvestris var.mongolica to different temperature parameters in Honghuaerji region

目的探究红花尔基樟子松树木径向生长对不同界限器测日均温度的响应特征。方法使用树轮年代学的方法建立符合国际研究范式的3种年表即标准年表(STD)、差值年表(RES)和自回归年表(ARS);使用相关分析方法确定树木年轮宽度年表与海拉尔气象站不同界限温度生长期参数(初日时间、终日时间、持续时间和活动积温)的响应关系。结果树木径向生长对不同界限温度表现出较大差异。其中3个年表与5~6.5℃的初日位序和5~5.5℃持续时间日位序显著相关(P<0.05),且ARS年表相关强度均高于同期STD和RES年表。树轮年表与终日和活动积温日位序相关较低,均未达到显著水平。结论不同界限温度的初日时间和持续时间的位序变化对红花尔基樟子松径向生长有重要影响,且其阈值出现在5~6℃的波动范围。ARS年表响应程度更强体现了研究区樟子松树木具有较强的共同扰动趋势,符合采样实际。

Purposes-To explore the response characteristics of radial growth of Pinus sylvestris var. mongolica to different daily average temperature parameters in Honghuaerji region, Hulunbeir, Inner Mongolia, China. Methods-The method of dendrochronology was adopted to establish three kinds of chronologies, namely tree-ring standard chronology （STD）, residual chronology （RES） and autoregressive chronology （ARS）. The correlation analysis was used to determine the relationship between ring-width chronology and different temperature parameters of Hailar meteorological station （i.e. onset day, end day, duration and active accumulated temperature）. Results-The radial growth of trees showed great variations to different boundary temperature. The three chronologies were signifi- cantly correlated with the onset-day order at 5-6.5 ℃ and the duration at 545.5 ℃ （P〈0.05）, and the correlation strength of ARS chronology was higher than those of STD and RES chronology. Lower correlations existed in chronologies, end day and active accumulated temperature. Conclusion-Var- iations of the onset day and duration at different temperatures have important effects on the radial growth of Pimes syl^estris var. mongolica, and the threshold value appears in the range of 5-6 ℃. The intense respon- ses of ARS chronology suggest the stronger joint disturbance of Pinus sylvestris var. morzgolica in the study area, which accords with the fact that pine grows in the sampling site.