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作 者 ：马玲,赵平,饶兴权,蔡锡安,曾小平,陆平

期 刊 ：生态学报 2005年 25卷 9期 页码：2145~2151

关键词：Granier热扩散式探针法；马占相思；树干液流；时滞；环境因子；

Keywords:Granier\‘s thermal dissipatsion probe method, Acacia mangium, sap flow, time lag, environmental factors,

摘 要 ：运用Granier热消散式探针法对华南丘陵退化荒坡植被恢复先锋树种马占相思(Acaciamangium)树干液流密度进行长期连续观测,并对其周围环境因子如空气温度、空气相对湿度、土壤相对湿度、光合有效辐射和总辐射进行同步观测。通过分析发现马占相思边材厚度与胸径存在显著线性相关关系;马占相思树干液流密度最大值与边材面积具显著相关关系;马占相思树干东、南、西、北4个方位测得的液流密度具显著差异,且各方位相互之间均有显著相关关系;马占相思树干液流每天到达峰值与光合有效辐射和水蒸气压亏缺到达峰值存在一定的时滞,这两个时滞与树高无关,个体间时滞差异在湿季较小,干季较大;干湿季液流平均值和最大值具显著差异,湿季蒸腾水量大于相同时间内干季蒸腾水量;液流的变化与空气温度、空气相对湿度、光合有效辐射、总辐射、水蒸气压亏缺等环境因子的变化具显著相关关系,按相关程度排序为:光合有效辐射>总辐射>水蒸气压亏缺>空气相对湿度>空气温度。

Abstract:Acacia mangium is one of the pioneer tree species of re-vegetation in degraded hilly lands in South China. Whole-tree sap flow in an A. mangium forest was measured continuously on 14 trees using Granier‘s thermal dissipation probe method over a period of four months. Environmental factors including air temperature, air relative humidity, soil relative humidity, photosynthetically active radiation (PAR) and global radiation were measured simultaneously with sap flow. Sapwood depth was highly correlated with ...

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