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生长季内官厅库区小叶杨单株树干液流通量密度的研究

, PP. 638-643

Keywords: 小叶杨,热脉冲,液流通量密度,气象因子,官厅库区

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Abstract:

利用热脉冲液流仪和微型自动气象站, 在北京市延庆县上辛庄水土保持站观测研究了雨季不同天气条件下官厅库区的小叶杨树干边材液流通量密度变化规律及其对环境因子(气象条件、土壤水分) 的响应。结果表明, 边材液流通量密度曲线在不同天气条件下均具有明显的昼夜变化规律: 液流通量密度通常于清晨5:30-6:30时开始上升; 12:00 13:00时达到峰值; 16:00时开始持续下降, 20:00时下降速度变慢, 至次日日出之前达到低谷。日液流通量密度( SFA)与日太阳辐射量( ESR)、日均空气温度( Ta )和日均空气相对湿度( RH )均存在极显著正相关关系,与日均0~ 40 cm 土层蓄水量( Sw40 )存在极显著负相关关系, 经回归分析建立了日液流通量密度与各环境因子的线性关系: SFA = 69. 7 + 5. 63ESR + 3. 12Ta + 0. 239RH - 1. 13Sw40 ( R = 0. 752)。

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