油松树干液流特征及其与环境因子的关系

Variation of Stem Sap Flow of Pinus tabulaeformis and Its Impact Factors

利用TDP(thermal dissipation probe)茎流计观测油松树干液流速率在生长季节的动态变化,并结合全自动气象站同步监测了环境因子。结果表明,油松树干液流速率连日变化为昼夜单峰曲线变化规律,白天差异显著,夜间差异不大。在油松主要生长月份(5-10月),各月的均值分别为19、26、36、41、21、9 cm.h-1;以气象因子作为自变量,以边材液流速率作为因变量,经过逐步回归,建立油松液流速率与环境因子的多元线性模型,回归方程极显著,其相关程度:太阳辐射>大气温度>相对湿度>风速>水汽压。

By means of thermal dissipation probe（TDP） and micro-meteorological station,daily meteorological factors and stem sap flow velocity（SFV）of Pinus tabulaeformis were measured from during its growing season（May to October in 2009）.The results showed that the daily changes of SFV were in a form of single-peak curve,the differences was significant in the daytime,but not significant at night.In the main growing season,the average month values of SFV were 19 cm·h-1,26 cm·h-1,41 cm·h-1,36 cm·h-1,21 cm·h-1 and 9 cm·h-1,respectively from May to October.Taking meteorological factors as independent variables and SFV as dependent variable,by stepwise regression,multiple liner equation of SFV and environmental factors were established.The equation was significant and the correlation coefficients being in the order of solar radiation〉 temperature 〉relative humidity 〉wind speed〉 vapor pressure.