| 尾巨桉树干液流动态及其影响因子分析1） |
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| 引用本文： | 王志超,杜阿朋.尾巨桉树干液流动态及其影响因子分析1）[J].东北林业大学学报,2016(5):24-28. |
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| 作者姓名： | 王志超 杜阿朋 |
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| 作者单位： | 国家林业局桉树研究开发中心，广东 湛江，524022 |
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| 基金项目： | 1)国家自然科学基金青年基金项目(31300383)；中央级公益性科研院所基本科研业务费专项资金项目( CAFYBB2014QB024)；广东湛江桉树林生态系统国家定位观测研究站运行补助(2015－LYPT－DW－006)。 |
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| 摘 要： | 为了正确认识桉树的耗水规律，利用热扩散探针法对2～3年生尾巨桉树干液流进行连续监测，分析其动态特征，并利用自动气象站同步测定林分气象条件，分析各气象因子与液流的关系。结果表明：2～3年生尾巨桉树干液流白天变化幅度较大，呈单峰曲线，占全天液流量的85％以上，变化特征与4年生尾巨桉相似，日平均树干液流密度为5．06 mL· h－1· cm－2较4～6年生尾巨桉日平均液流密度大，夜间液流曲线平坦且较弱，夜晚平均树干液流密度为1．79 mL· h－1· cm－2是4年生的3．8倍。不同月份间晴天的树干液流特征存在较大差异。不同天气条件下，晴天的液流启动时间最早（7：00），达到峰值所需时间最短（4．5 h），且液流峰值最大（18．47 mL· h－1· cm－2），持续时间最长，日液流量也最大；其次是阴天，最后为雨天。2～3年生尾巨桉树干液流密度与大气温度、风速、太阳辐射、光合有效辐射以及水汽压亏缺呈极显著正相关（P＜0．01），与空气湿度呈极显著负相关（P＜0．01），相关系数分别为0．468、0．127、0．903、0．909、0．778、－0．626，这与4年生尾巨桉影响因子略有不同；日耗水量与大气温度、太阳辐射、光合有效辐射和水汽压亏缺呈极显著正相关（P＜0．01），与空气湿度呈显著负相关（P＜0．05），相关系数分别为0．489、0．489、0．523、0．408、－0．184。
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| 关 键 词： | 尾巨桉 树干液流 环境因子 热扩散式探针法 |
Characteristics of Stem Sap Flow of Eucalypt and Its Relation to Environmental Factors |
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| Abstract: | In order to understand eucalyptus water consumption , we used a thermal dissipation probe ( TDP ) to measure the var-iation of stem sap flow for 2-3 a Eucalyptus urophylla×E.grandis, and analyzed dynamic characteristics .We also measured the environmental factors simultaneously with automatic meteorological station , and analyzed the relationship between vari-ous meteorological factors and flow .The stem sap flow varied larger in the daytime , and it was a unimodal curve .It accoun-ted for over 85%of the fluid flow throughout the day .The variation characteristics were similar to 4-a Eucalpy tus urophylla ×E.grandis.The average flow density of trunk was 5.06 mL· h-1 · cm-2 which was bigger than that of 4-6 a.There were weak sap flow activities in the evening .The change trend of the density of liquid flow was decreased before midnight .Late-night flow density was relatively stable and less than before midnight .The average flow density of trunk was 1.79 mL· h-1 · cm-2 which was 3.8 times of that of 4 a.There was a big difference between different months about the stem sap flow of it . In different weather conditions , the flow of sunny days start at the earliest time ( 7:00 ) , and peak time needed for the shortest (4.5 h), and flow peak is the largest (18.47 mL· h-1· cm-2), longest, daily fluid flow is the biggest.The sec-ond is the cloudy day followed by a rainy day .The stem sap flow were extremely significantly positive correlation with air temperature, wind speed, solar radiation, photosynthetic available radiation, and vapor pressure deficit (P<0.01), and were very significantly negative correlation with the air humidity ( P<0.01) , with the correlation coefficients of 0.468, 0.127, 0.903, 0.909, 0.778, and -0.626, respectively, different from those of 4-a.The daily water consumption was extremely significantly positive correlation with atmospheric temperature , solar radiation, photosynthetic available radiation and vapor pressure deficit ( P<0.01) , and was very significantly negative correlation with the air humidity ( P<0.05) , with the corre-lation coefficients of 0.489, 0.489, 0.523, 0.408, and -0.184, respectively. |
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| Keywords: | Eucalyptus urophylla ×E grandis Stem sap flow Environmental factors Thermal dissipation probe ( TDP ) |
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