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雷州半岛尾叶桉人工林耗水量研究

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Keywords: 尾叶桉,蒸腾作用,茎流密度,边材,热脉冲技术

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Abstract:

利用热脉冲技术对雷州半岛2种主要土壤类型下的4年生尾叶桉人工林林分耗水量进行了为期1 a的观测,并对林分耗水与林分生长特性、气象因子及4 m 深土壤有效水关系进行研究。研究结果表明: 尾叶桉人工林边材面积与胸径具有显著的相关性, 利用边材面积进行单株向林分尺度耗水的转换可行; 河头、纪家尾叶桉人工林日平均茎流密度分别为2 772、1 839 L m-2 d-1; 日平均耗水量分别为1. 49、1. 53 mm; 河头与纪家尾叶桉人工林林分的年耗水量分别为542、559 mm, 分别占年降水量的35%、36%; 开阔的林冠及较小的叶面积指数、旱季时土壤有效水的减少及较低的饱和蒸汽压差等在不同程度上都限制了桉树的耗水量。

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