影响毛乌素沙地臭柏年轮宽度变化的主要气候因子分析

Analysis on Main Climatic Factors Affecting Ring-Width Variance of Sabina Vulgaris Grown in Mu Us Sandland

应用相关分析和因子分析方法 ,研究了影响毛乌素沙地沙丘顶部臭柏 ( Sabinavulgaris)年轮宽度变化的气候因子。结果表明 :生长季的降水能够促进沙丘顶部臭柏的径向生长 ,但生长季的高温对匍匐生长的沙丘顶部臭柏有抑制作用。 1 0月份开始进入休眠期后 ,气温过高会影响下一年度臭柏的生长。以各个变量的因子负荷量为依据 ,对各个气候变量的效应分析结果表明 ,温度变量比降水变量的效果显著 ,其中对年平均气温影响最大的是冬季平均气温 ;年降水量主要受夏季降水量和秋季降水量的影响 ;冬季平均气温和生长季降水具有明显的正效应 ,但春季高温会产生负效应。

Main climate factors affecting ring-width variance of Sabina vulgaris grown in Mu Us Sandland were investigated by correlation analysis and factors analysis. The results showed: Rainfall in growth season could accelerate the radial growth of S. vulgaris on the top of dune. However, high temperature would restrain the growth of its stolon. Trees started to come into dormancy in October. Too high temperature made its dormancy in an abnormal status and accordingly the growth in next year was interfered. Discussions were done based on factor loading of every variable for the effect of climatic variables. Results showed that temperature had a greater effect than precipitation and that the average temperature in winter had the greatest effect on the annual average temperature. Also results showed that annual precipitation was determined mainly by precipitation in summer and autumn. Average temperature in winter and precipitation in growth season would have a significant positive effect on growth, but too high temperature would have a negative one in spring.