应用热扩散技术对亚热带红壤区湿地松人工林树干边材液流的研究

Applying the Heat Dissipation Technique to Study the Sap Flow of Pinus elliottii in the Red Earth Area of Subtropical China

使用TDP热扩散技术在2003年5月21日1554至6月6日904对亚热带红壤丘陵区湿地松人工林液流速率进行连续测定和分析。结果表明1)测量时间内湿地松日均液流速率表现出稳定的昼夜变动规律,平均液流速率为82.43cm.d-1;2)对湿地松液流速率影响最明显的4个环境因子是空气温度、土壤温度、太阳辐射和空气相对湿度;3)对TDP液流数据质量控制可以通过特定时段的液流最大速率和平均速率之比及其置信区间分析,以及相关分析、配对t检验来进行。

The heat dissipation technique was applied to measure the sap flow velocity of Pinus elliottii in the artificial forest of subtropical southern China from May 21^st 15：54 to June 6^th 9：04 in 2003. The results showed that the average sap velocity of the measured three trees was 82.43 cm · d^-1 with a normal pattern of diurnal variation, during the measuring period. Air temperature, soil temperature, solar radiation and relative humidity of atmosphere, were the most significant factors effecting the sap flow velocity. We also found that the data quality control of sap flow velocity could be performed by the ratio of maximum value to average value for sap flow observations and its concerned confidence interval analysis, correlation analysis and paired t- test.