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作 者 ：孙慧珍,周晓峰,赵惠勋

期 刊 ：生态学报 2002年 22卷 9期 页码：1387~1391

关键词：热扩散法；树干液流；季节动态；环境因子；白桦；

Keywords:thermal dissipation probe, stem sap flow, seasonal dynamics, environmental factors, Betula platyphylla,

摘 要 ：应用热扩散原理 ,采用 ICT-2 0 0 0 TE(Transpiration-Environment)自动监测系统 ,对东北东部山区的先锋树种白桦的树干液流及主要环境因子进行一个生长季的同步测定。结果表明 ,在整个生长季的晴天 ,白桦树干液流的日变化呈现明显的单峰曲线。液流速率的峰值出现在 8月中旬 ,为 84.72 L/ d。在白桦树叶脱落后 ,仍有较高的液流速率 ,而到 1 0月中旬急剧下降 ,值为 3 .84L/ d。在不同生长时期白桦每小时的液流速率与相应的环境因子逐步回归分析结果表明 ,影响白桦液流速率的主要环境因子是空气温度、空气相对湿度和辐射强度 ,在不同时期三者的作用是不同的。

Abstract:A study of whole tree sap flow of Betula platyphylla was conducted during the 2000 growing season. The study area was located at the Forest Ecosystem Research Station (127°30′～127°34′E Longitude, 45°20′～45°25′N Latitude) in the Maoershan Experimental Forest, Northeast Forestry University, Heilongjiang Province. Within the Maoershan range, the average elevation is 300m and the highest peak is 805m. The undulating slope of the terrain generally ranges from 10° to 15°. The zonal soil is dark brown fores...

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