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利用热扩散式液流探针(TDP)对天目山柳杉树干液流进行连续观测,并对多个环境因子进行同步测定。结果表明:柳杉树干液流晴天、阴天日变化呈单峰曲线,雨天则变化不明显。春季晴天树干液流在6:00启动,13:00达到峰值,启动时间比秋季早1h,春季液流维持时间长于秋季。春、秋季阴天液流变化与晴天相似,但启动时间、达到峰值及开始下降时间的变化节律明显不同。液流速率与光合有效辐射、空气温度、空气湿度、叶面湿度呈显著性相关关系,但与二氧化碳浓度的关联性较低,而且不同季节液流速率与叶面湿度的关联属性相异。利用多元统计方法建立了不同季节树干液流与环境因子的回归方程,春季:Vs=-23.785+0.032PAR+9.944Ta-1.022Rh+1.263Lh,秋季:Vs=29.635+0.069PAR+4.641Ta-0.756Rh-1.072Lh。
The thermal diffusive flow probe (TDP) was used to observe the trunk flow of Cryptomeria fortunei in Tianmu Mountain, and the simultaneous determination of several environmental factors. The results showed that the diurnal variations of the sunny and cloudy days of Cryptomeria fortunei showed a single peak curve, while the change of rainy days was not obvious. Spring sunny flow of tree sap flow at 6:00, reached the peak at 13:00, start-up time 1h earlier than in autumn, the spring flow longer than the fall. The changes of cloudy and cloudy days in spring and autumn were similar to those in sunny days, but the rhythms of start-up time, peak value and start-down time were obviously different. There was a significant correlation between the flow rate and photosynthetically active radiation, air temperature, air humidity and leaf surface humidity, but the correlation with the concentration of carbon dioxide was low, and the correlations between the flow rate and leaf surface humidity were different in different seasons. The regression equation of the trunk flow and environmental factors in different seasons was established by multivariate statistical methods. Spring: Vs = -23.785 + 0.032PAR + 9.944Ta-1.022Rh + 1.263Lh, autumn: Vs = 29.635 + 0.069PAR + 4.641Ta-0.756 Rh-1.072Lh.