摘要
利用热扩散式液流探针(TDP)对天目山柳杉树干液流进行连续观测,并对多个环境因子进行同步测定。结果表明:柳杉树干液流晴天、阴天日变化呈单峰曲线,雨天则变化不明显。春季晴天树干液流在6:00启动,13:00达到峰值,启动时间比秋季早1h,春季液流维持时间长于秋季。春、秋季阴天液流变化与晴天相似,但启动时间、达到峰值及开始下降时间的变化节律明显不同。液流速率与光合有效辐射、空气温度、空气湿度、叶面湿度呈显著性相关关系,但与二氧化碳浓度的关联性较低,而且不同季节液流速率与叶面湿度的关联属性相异。利用多元统计方法建立了不同季节树干液流与环境因子的回归方程,春季:Vs=-23.785+0.032PAR+9.944Ta-1.022Rh+1.263Lh,秋季:Vs=29.635+0.069PAR+4.641Ta-0.756Rh-1.072Lh。
From March to May and September to November 2009,stem sap flow of Cryptomeria fortunei at Mount Tianmu was continuously monitored with thermal dissipation probe（TDP）.Several environmental factors were also measured.Dynamic changes of the flow showed a single peak curve in sunny and cloudy days.However,the magnitude of the variation was not obvious in rainy days.In the sunny days in spring,the flow started to move at about 6：00,and reached its peak value at about 13：00.In spring,it started one hour earlier and acted longer than in autumn.The dynamic changes of the flow in cloudy days demonstrated similar patterns to those in sunny days,however,the starting time,the time to reach its peak value,and the time begun to decline were quite different.Significant correlations were observed between the flow rate and photosynthetic active radiation（PAR）,temperature,relative humidity,and leaf humidity,while the relevance was poor with carbon dioxide concentration.Moreover,the relevance between the sap flow and the humidity of the leaf surface were different in different seasons.The regression equations between the flow of stem and environmental factors were established by using multiple statistics：Vs=-23.785＋0.032PAR＋9.944Ta-1.022Rh＋1.263Lh（spring）;Vs=29.635＋0.069PAR＋4.641Ta-0.756Rh-1.072Lh（autumn）.
出处
《西北林学院学报》
CSCD
北大核心
2013年第2期8-14,共7页
Journal of Northwest Forestry University
基金
国家自然科学基金项目(30972342)
关键词
柳杉
树干液流
春秋季
环境因子
Crylotomeria fortunei
stem sap flow
spring and autumn
environmental factor
