岩溶区青冈栎的年轮特征及其与环境因子的关系

Cyclobalanopsis glauca's tree-ring characteristics and its relationship with environment factors in karst region

关键词:  岩溶  年轮宽度  年轮指数  生长特征  环境因子

Key words:  karst  tree-ring width  tree-ring index  growth character  environmental factors

摘要:

为揭示岩溶区植物生长特征及其与环境因子的关系,利用年轮分析方法研究了岩溶区广泛分布的乔木树种青冈栎的年轮特征及其与环境因子的关系。结果表明:青冈栎年轮宽度和年轮指数的平均值分别为(2.565±0.028)mm和1.108±0.012。随着胸径的增大,年轮宽度和年轮指数在逐渐增大,年轮指数与气候因子的变化有着相关关系,与前一年6月份、12月份以及当年12月份的平均温度呈显著正相关,而与前一年4月份、10月份以及当年4月份的降雨量和前一年8月份、9月份以及当年2月份的日照总时数呈显著负相关。表明岩溶区青冈栎的生长可能主要受到温度变化的影响,降雨量和日照时数的变化也影响着青冈栎的年轮特征。温度,降雨量和日照时数等环境因子共同制约着岩溶区青冈栎的生长。

Abstract:

Tree ring-width analysis was used to investigate the relation of tree-ring characters and environmental factors in karst region in order to find out relationship between the growth feature of Cyclobalanopsis glauca and environmental factors. All trees chronologies were developed from the cross-dated ring width series using the program WinDENDRO 2006. The results showed that the average ring width and ring index of C.glauca was(2.565±0.028)mm and 1.108±0.012,respectively. The ring width and ring index were increased in association with diameter increases. The correlation analysis showed that the tree-ring index of C.glauca was positively correlated with temperature of previous June,December and current December,while it was negatively correlated with precipitation of previous April,October and current April,and it was also negatively correlated with solar hours of previous August,September and current February. The results indicated that temperature with precipitation and solar hours jointly controled the growth of C.glauca in karst region.