山西太岳山油松林木非生长季树干液流研究

Sapflow Velocity of Pinus Tabulaefomis in Non-growing Seasons in the Taiyue Mountain,Shanxi Province,China

2009年9月到2010年3月,在山西沁源县灵空山林场建设观测塔,用TDP探针对塔周围的不同胸径的11棵油松林木在非生长季的树干液流速率及环境因子进行连续监测,研究油松林木树干液流变化规律。结果表明:非生长季的油松树干液流并没有停滞,正午的峰值逐渐消失,液流主要在夜间进行,最大值为16.11 cm.h-1,最小值为5.109×10-5 cm.h-1,平均值为3.29 cm.h-1。在属于生长季末期的10月,不时有和生长季相同的单峰曲线出现,11月下旬后,白天和夜间的树干液流并无明显差异,趋于平稳。阴天则无峰或多峰。影响油松树干液流的环境因子主要有光合有效辐射、空气温度和相对湿度,三者都与液流速率既有显著正相关关系,又有显著负相关关系。土壤湿度与油松树干液流速率呈正相关关系。与太岳山生态站2005年所做的油松林木夏季的树干液流速率研究成果相结合,可以比较完整地反映油松林木树干液流速率全年的变化规律。

During the period of Sept. 17,2009 to March 30,2010,TDP probes were used to conduct longterm monitoring survey of the sap flow rates of 11 Pinus tabulaeformis around the tower in the forestry farm in the Lingkong Mountain in Shanxi province. The results showed that the sap flow of Pinus tabulaeformis did not stall in non-growing seasons. The peak at noon gradually disappeared and the flows mainly showed at night with the maximum of 16. 11cm·h^-1 ,the minimum of 5. 109 × 10^-5 cm·h^-1,and an average of 3.29 cm·h^-1. During the late growing season in October the sap flow diurnal change curve was a single peak, while after late November the change of day and night was small, displaying an even tendency. The main factors influencing the sap flow included photosynthetic active radiation, air temperature and relative humidity, and both significant positive and negative correlation were found between the three factors and the sap flow rate. Positive correlation showed between soil moisture and the rate in a long term.