| 朱敏捷,赵从举,徐文娴,郑庆扬.尾叶桉树干液流方位差异及其对环境因子的响应[J].海南师范大学学报自科版,2017,30(2):177-184 |
| 尾叶桉树干液流方位差异及其对环境因子的响应 |
| The Differences of Eucalyptus urophylla Stem Sap Flow Velocities inDifferent Directions and Relations Between Velocitiesand Environmental Factors |
| 投稿时间：2017-03-17 |
| DOI：10.12051/j.issn.1674-4942.2017.02.012 |
| 中文关键词: 尾叶桉 树干液流 热扩散探针 环境因子 |
| 英文关键词: Eucalyptus urophylla stem sap flow thermal dissipation probe（TDP） environmental factor |
| 基金项目:国家自然科学基金项目（41361006）；2015海南省研究生创新科研课题（Hys2015-42） |
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| 中文摘要: |
| 研究不同方位间树干液流速率的差异及树干液流速率变化对环境因子的响应，有利于
对桉树蒸腾耗水、水分利用效率的定量估算. 以海南儋州林场尾叶桉人工林为研究对象，运用热扩
散探针对尾叶桉树干东、南、西、北不同方位的液流进行连续监测研究. 结果表明：（1）不同天气条
件下的尾叶桉树干液流速率变化趋势不同，晴天液流变化呈单峰型曲线，阴天和雨天呈多峰型或
无峰型曲线；尾叶桉树干不同方位之间的液流速率日变化趋势相似，但液流启动与到达峰值的时
间存在时滞，其中东、南方位液流启动与到达峰值时间分别较西、北方位要早20 min 左右.（2）不同
天气条件下，尾叶桉树干不同方位之间的液流速率均呈极显著正相关（p＜0.01），且存在显著（p＜
0.05）或极显著（p＜0.01）差异，晴天、阴天和雨天的东、南、西、北4 个方位的树干液流速率最低值较
最高值分别低13.7%、34.4%和9.4%.（3）晴天、阴天、雨天的光合有效辐射、大气温度、相对湿度和
土壤水分等环境因子对树干液流速率变化的贡献不同；晴天和阴天是光合有效辐射对树干液流速
率影响最大，其次是相对湿度；雨天是相对湿度对树干液流速率影响最大，其次是光合有效辐射；
气温与土壤水分对树干液流速率影响相对较小. 该研究为海南桉树林分尺度蒸腾耗水准确测算和
人工林生态效应评估提供了基础数据，为进行更大时空尺度的树干液流监测提供了方法参考. |
| 英文摘要: |
| It is useful to quantitatively estimate the water consumption and water use efficiency of Eucalyptus urophylla
by studying the difference of sap flow rate and the response of stem flow rate to environmental factors in different directions.
The Eucalyptus urophylla plantation in Danzhou Forest Farm of Hainan Province was used as the research object, and the
continuous monitoring of different orientations of east, south, west and north was carried out by using thermal diffusion
probes. The results show that: (1) The diurnal change pattern of sap flow rates of Eucalyptus urophylla is similar in different
directions, but the change trend of sap flow rates was different under different weather conditions. In sunny days, it shows a
single peak curve, and multi peak or no peak curve in cloudy and rainy days. The time of starting and reaching the maximum value of the sap flow is about 20 minutes earlier in the east and south directions than that in the west and north directions. (2) There is a significant positive correlation（p＜0.01）between the sap flow rates of Eucalyptus urophylla and also
there was a significant（p＜0.05）or extremely significant（p＜0.01）difference under different weather conditions; the different sap flow rates between the minimum and the maximum in the four directions is about 13.7%, 34.4%, and 9.4% in
sunny, cloudy, and rainy days, respectively. (3) In sunny, cloudy, and rainy days, the contribution and influence are different on the Eucalyptus urophylla sap flow rates exerted by environmental factors including photosynthetic active radiation,
air temperature, relative humidity and soil water. Photosynthetic active radiation is the most important factor affecting sap
flow rates and air relative humidity is the second in sunny and cloudy days, while air relative humidity has the greatest influence and photosynthetic active radiation, in rainy days. Air temperature and soil water have relatively little influence on Eucalyptus urophylla sap flow rates in sunny, cloudy and rainy days. This study provides the basic data for the accurate estimation of transpiration water consumption and the ecological effect evaluation of the Eucalyptus urophylla plantation in Hainan, and provides a reference for the monitoring of the stem flow of the larger time scale. |
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