万仙山油松径向生长与气候因子的关系

以万仙山油松(Pinus tabulaeformis)为样本,建立了油松树木年轮宽度序列的标准年表(STD)。与附近气象因子的相关结果表明:与当年6月平均温度呈较为显著的负相关,与前一年的9月和当年的5月以及春季(3-5月)的降水量呈显著正相关,显然影响万仙山油松生长的主要气候因子是5月(或说春季)降水和6月温度。树轮指数与各月PDSI相关值都很高(其中与当年5月的PDSI相关值高达0.614),都超过95%的置信水平,说明水热组合是该区域油松生长的主要限制因子。研究表明,影响本区油松生长的气候因子与我国北方地区油松生长的影响因子有较高的一致性,尤其是生长季前期的温度影响都很大;而其降水的影响及其与PDSI的相关都明显超前于黄土高原及北方地区,这既说明影响油松生长的大气候因子相似,又表明夏季风从东南向西北的不断推进。

Response of radial growth Chinese pine (Pinus tabulaeformis) to climate factors in Wanxian Mountain of He'nan Province

Tree-ring width standard chronology was developed by using the tree-ring cores of Chinese pine (Pinus tabulaeformis) from Wanxian Mountain in south Taihang Mountain ranges, northern He'nan Province. Tree growth showed significantly negatively correlations with mean temperature in current June based on response function analyses. Radial growth patterns showed significantly positive correlations with precipitation in previous September and current May and the current spring (March-May). To sum up, precipitation in current May or the current spring (March-May) and temperature in current June are main affecting factors to the radial growth of Chinese pine (Pinus tabulaeformis) of the study region. As the PDSI is a direct measure of soil moisture availability, we analyzed correlations of tree rings with monthly PDSI data. All correlations were higher and significant at the 95% confidence level, relative to the correlations with temperature and precipitation. The PDSI-tree growth correlation peaks in May (0.614), followed by the correlations in April (r=0.607) and April-May (r=0.604), and higher correlation in spring (r = 0.591), these shows that combinations of temperature and precipitation are main limiting factors to radial growth of Chinese pine in the study region. The response results indicated similar climate-growth relationships for Chinese pine in northern China, particularly for the temperature of the early growing season. Moreover, the influence of precipitation and PDSI to Chinese pine had obviously advancing in schedule with the loess plateau and other northern China. This indicated potential linkages between different position of the Chinese pine growth and the summer monsoon advancement.