在土壤-植物-大气连续体构成的水流路径中,树干液流量制约着整个树冠的蒸腾量,如何直观、精确和连续测定水分在木质部中的流动速率是科学家们一直在探索和渴望解决的问题(Baker et al.,1987).近几十年来,国内外相关领域的学者们相继提出了一些诸如称重法、截干法和茎流速率法等不同的测定方法,目前茎流速率法应用最为广泛.茎流速率法主要包括放射法同位素示踪法、染色法、热脉冲法、热扩散探针法、热平衡法和核磁共振图像扫描法,这些方法在使用上都有一定的适用性和局限性(刘奉觉等,1997).
摘要(英文)：
This study investigated daily and seasonal changes in sap flow rates of individual trees and their relationships to environmental factors in a 18-year-old Chinese Fir plantation, with an ICT200OTE automatic system （TDP30 probe） from December 2005 to November 2006. A single peak pattern was observed for the daily changes in sap flow rates of individual Chinese Fir tree in fine and overcast days with the peak time occurring at 12：30, while no significant variation and no regular change pattern of sap flow rate were found in rainy days. The dai...
