从同步数据分析乔木树干液流与气象因子的关系  

Relationship between Tree Trunk Sap Flow and Meteorological Factors from Synchronous Data

作　　者：马泽[1] 宋维峰[1] 徐小青 储娅 MA Ze;SONG Wei-feng;XU Xiao-qing;CHU Ya(College of Soil and Water Conservationt,Southwest Forestry University,Kunming 650224,Yunnan,China;Sangganhe Poplar Forest Experiment Bureau of Shanxi Province,Datong 037045,Shanxi,China)

机构地区：[1]西南林业大学水土保持学院,云南昆明650224 [2]山西省桑干河杨树丰产林实验局,山西大同037045

出　　处：《林业科学研究》2024年第2期165-177,共13页Forest Research

基　　金：国家自然科学基金项目(41371066);云南省基础研究重点项目(202001AS070042)。

摘　　要：[目的]树干液流是研究植物蒸腾耗水的重要生理指标,树种和气象因子均是其关键影响因素。本文旨在消除树种因素限制,探讨树干液流与气象因子之间的关系。[方法]以哈尼梯田水源区3种林分中10种乔木树种为研究对象,采用Granier热扩散探针技术测定其树干液流速率,将其同步数据与气象因子进行关联分析。[结果]从次生落叶阔叶林和原生常绿阔叶林的7779条乔木树干液流速率数据中发现7条异常数据,且这些异常数据在各个树种中都表现出同步一致性;进一步关联分析表明,太阳辐射的突然增加是产生乔木树干液流数据同步上升的主要原因,而降雨则是产生树干液流数据同步下降的主要原因,两者的变化可导致其他气象因子发生变化,从而影响树干液流速率;树干液流与气象因子存在一定的时滞效应,在发生同步异常数据的气候条件下,树干液流滞后太阳辐射0~30 min,提前于饱和水汽压差、气温和湿度0~60 min,滞后或提前时间远小于正常气候条件下各树种的时滞时间。[结论]乔木树干液流受到太阳辐射和降雨等气象因子的综合调节,其中太阳辐射的影响最为显著。研究结果可为从生理生态角度探究乔木的蒸腾作用与气象因子的关系提供科学依据。[Objective]Trunk sap flow is an important physiological indicator for the study of plant transpiration water consumption,and both tree species and meteorological factors are key influencing factors.This study aims to remove the limitation of tree species factor and explore the relationship between tree trunk sap flow and meteorological factors.[Method]Based on ten tree species in 3 forest stands in the water source area of Hani Terraces,their trunk sap flow rates were measured by using thermal dissipation probe(TDP)technology,and the relationship between synchronized data and meteorological factors were analyzed.[Result]Seven abnormal synchrony data were found from 7779 tree trunk sap flow rate data in secondary deciduous broadleaf and primary evergreen broadleaf forests,and these abnormal synchrony data showed synchronous consistency across tree species;Further correlation analysis showed that the sudden increase in solar radiation was the main cause of the synchronous increase in sap flow rate,while rainfall was the main cause of the synchronous decrease in sap flow rate,and changes in both could lead to changes in other meteorological factors,which could affect the trunk sap flow rate;There was a certain time lag effect between tree trunk sap flow and meteorological factors:under abnormal climate conditions,sap flow lagged solar radiation by 0~30 min and was ahead of saturated water vapor pressure difference,with air temperature and humidity of 0~60 min,and the lag or advance time was much smaller than the time of each tree species under normal climatic conditions.[Conclusion]Tree trunk sap flow is regulated by a combination of meteorological factors such as solar radiation or rainfall,with solar radiation having the most pronounced effect.The paper may provide a scientific basis for studying the relationship between transpiration and meteorological factors in trees at the physiological-ecological level.

关 键 词：树干液流 气象因子 关系分析 同步异常 时滞效应 

分 类 号：S715.2[农业科学—林学]