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中文摘要：
树干液流在微时空尺度上具有较大的变异性，尺度扩展过程中又极易引起误差，而有些环境因子则是在较大空间尺度上发生变化，容易降低液流密度研究结果的可靠性。引入单位面积液流日累积量（Qa）和液流密度峰值（Jsmax）这2个参数，根据树高和胸径划分不同优势度，研究木荷树干液流时空动态特征及与环境因子的关系，探讨液流密度研究更合理的方法。结果表明：2007年9月到2008年4月木荷优势木、中等木和劣势木液流日进程均呈现单峰格型，根据树高划分优势度等级的木荷中等木平均液流密度要略大于优势木，劣势木的平均液流密度远远低于优势木和中等木；而根据胸径划分优势度等级的木荷优势木液流大于中等木，中等木液流大于劣势木；光合有效辐射是影响优势木和中等木液流密度的主要环境因子，劣势木液流密度主要受气温影响；在干旱胁迫下，土壤含水量对优势木和中等木液流密度瞬时变化的影响比劣势木显著；总体而言，土壤湿度对液流瞬时值影响不大，但显著影响大时间尺度上优势木液流累积量的变化。按树高划分的木荷等级对环境因子的响应更敏感，而按胸径划分的木荷等级显示树形因子对液流的影响不可忽略。根据研究的需求不同，按树高或胸径分级各有优势。
英文摘要：
A Granier TDP method was applied to continuously monitor sap flow of Schima superba which is native tree species in South China and data of the changes of environmental factors was synchronously collected to explore dynamic characteristic of trunk sap flux density at different temporal scales and its relation with different dominance and environment factors. The results showed that the daily pattern of sap flux density of dominant, middle and depressed woods exhibited a single-peak curve. The maximum sap flux density of middle wood was slightly higher than that of dominant wood, but the depressed wood was far below those of middle and dominant. Photosynthetically active radiation （PAR） was major factor influencing trunk sap flux density of dominant and middle woods, while air temperature （TA） influenced mainly the depressed wood under the drought stress. Soil moisture （SM） did not apparently influence instantaneous sap flux density, but daily accumulated amount of flux in dominant woods.
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