幼龄桉树茎流特征及其对环境因子的响应  

Characteristics of the Sap Flow Rate of the Young Eucalyptus and Its Response to Environmental Factors

作　　者：吴喆滢 赵从举[2] 徐文娴[2] 卓志清[2] 朱敏捷[2] 

机构地区：[1]海南师范大学生命科学学院,海南海口571158 [2]海南师范大学地理与旅游学院,海南海口571158

出　　处：《西北林学院学报》2015年第5期46-52,共7页Journal of Northwest Forestry University

基　　金：国家自然科学基金项目(41361006);国家科技支撑计划项目(2012BAC18B04);海南省自然科学基金项目(413126);海南师范大学研究生创新项目(Hsyx2014-49)

摘　　要：旨在揭示幼龄桉树茎流速率变化特征及其与环境因子关系，为桉树人工林可持续经营与管理提供依据。于2014年6—9月利用Dynagage包裹式茎流传感器和DL2e环境因子测量系统对海南西部儋州林场幼龄桉树树液茎流及主要环境因子进行连续监测。结果表明，1）雨季幼龄桉树茎流速率具有“昼高夜低”的节律性，夜晚茎流速率都很小，约为日均值的0．10％～7．27%）。2）晴天、阴天、雨天树液茎流速率差异明显，晴天的树液茎流速率峰值、日均值分别为13．861mL·cm^-2·h^-1和2．349mL·cm^-2·h^-1，是阴天的2．27倍和1．50倍，雨天的10．52倍和4．90倍。3）雨季幼龄桉树茎流速率与太阳辐射、空气湿度、空气温度等气象因子均具极显著的相关关系，而受土壤水分影响较小；晴天太阳辐射对茎流速率影响最大，阴天和雨天空气温度对茎流速率影响最大。液流速率与环境因子逐步回归分析结果表明，3种天气条件下的影响液流速率变化的主导因子不同。To explore the change characteristics of the sap flow rate of the young Eucalyptus and its relationships with environmental factors, and provide scientific basis for the sustainable operation and management. Danzhou Forest Farm, which lies in western Hainan Island, was chosen as a research area, where the sap flow rate and environmental factors were continuously measured by using Dynagage sap flow sen- sors （developed by Dynamax Inc. ） and DL2e environmental data acquisition systems （developed by Delta- T Devices Ltd. ） from June to September 2014. The results showed that, 1） during the rainy season, young Eucalyptus stem sap flow rate followed a diurnal pattern, whereby rates were high during the day and low during the night, and the sap flow rates were very small at night, about 0.10%--7.27o//oo of daily average value. 2） In sunny, cloudy and rainy days, the stem sap flow rates were significantly different. In sunny days, the averages of peak values and daily mean values were 13. 861, 2. 349 mL ~ cm 2 . h 1, were about 2.27, 1.50 times of cloudy days, and 10.52, 4.90 times of rainy days, respectively. 3） Sap flow rate was significantly correlated with solar radiation, relative humidity, air temperature in rainy season, and little with soil water. Solar radiation was the predominant factor affecting stem flow rate in sunny days, but the air temperature was the predominant factor in cloudy and rainy days. The multiple regres- sion analysis of flow rates and environment factors showed that the dominating factors affecting the stem sap flow rates were different on sunny, cloudy and rainy days.

关 键 词：包裹式茎流传感器 尾叶桉 树干液流速率 环境因子 

分 类 号：S718.45[农业科学—林学]