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Position: Home > Articles > Sap Flow in the Stem of Eucalyptus and Changes in Meteorological Factors are not Consistent

热带桉树树干液流的时滞效应分析

作  者：
王城城;叶文伟;赵从举;陈丽艳
单  位：
海南师范大学地理与环境科学学院
关键词：
桉树;液流;环境因子;时滞;土壤含水率
摘  要：
【目的】探明热带桉树树干液流与环境因子间的时滞效应及其影响因素。【方法】运用Granier热扩散探针技术对海南省西北部儋州林场生长季(5—10月)桉树树干液流速率进行了实时监测,并同步监测了光合有效辐射(PAR)、大气温度(Ta)、相对湿度(Rh)和0～60cm土壤含水率(SWC),运用错位相关法分析了液流速率与PAR和饱和水气压亏损(VPD)之间的时滞长度。【结果】典型晴天下桉树液流速率日变化特征呈"双峰型"曲线,存在光合午休,液流速率抵达峰值时间较PAR和VPD提前约60 min;液流速率与环境因子(PAR、VPD)间均呈极显著正相关(P<0.001)。整个生长季桉树液流速率与环境因子间存在明显时滞,分别提前于PAR和VPD约30 min和50 min。SWC对桉树液流速率与环境因子间的时滞效应影响达显著性水平(P<0.05),当SWC较高(15.42%)时,液流速率对PAR和VPD的时滞分别为-60 min和-30 min,而SWC较低(10.45%)时分别为0和-60 min;桉树径级对液流速率时滞效应的影响未达到显著性水平(P>0.05)。【结论】热带桉树树干液流与环境因子间存在明显的时滞现象,表现为液流速率提前于PAR和VPD,影响液流与环境因子间时滞效应的主要因子为SWC,综合考虑不同环境因子间的差异可促进桉树的时滞效应研究。
译  名：
Sap Flow in the Stem of Eucalyptus and Changes in Meteorological Factors are not Consistent
作  者：
WANG Chengcheng;YE Wenwei;ZHAO Congju;CHEN Liyan;College of Geography and Environmental Science, Hainan Normal University;
关键词：
Eucalyptus;;sap flow;;environmental factors;;time lag;;soil water content
摘  要：
【Objective】Water ascent in plants is driven by water vaporization from their leaves and mediated by meteorological factors. However, how plant species affect the time taken by water to flow from soil to leaves remains poorly understood. Taking Eucalyptus as an example, we measured the sap flow in its stem in response to temporal changes in environmental and meteorological factors.【Method】The experiment was conducted at the Danzhou Forest Farm in Hainan, China. We measured the sap flow in the stem of a six-year-old Eucalyptus tree continuously for 6 months, using the Granier-type thermal dissipation probe(TDP). In the meantime, we also measured the photosynthetically active radiation(PAR), vapor pressure deficit(VPD), soil water content from the depths of 0 to 60 cm. The delay or advance of the sap flow was analyzed by comparing its correlation with temporal changes in PAR and VPD.【Result】Diurnal sap flow showed double peaks; there was a depressed photosynthesis at midday. On typical sunny days, sap flow peaked ahead of PAR and VPD by 60 min. Partial correlation analysis showed positive correlations between sap flow and PAR and VPD, both at significant level(P<0.001). Sap flow in the growing season was ahead of PAR and VPD by 30 min and 50 min respectively. The impact of soil water content on the inconsistency between sap flow and meteorological factors was significant(P<0.05) but the significance varied. When soil water content was >15.42%, sap flow was ahead of PAR and VPD by 60 min and 30 min respectively, while when it was <10.45%, the associated time advance changed to 0 min and 60 min respectively.The diameter of the stem did not show significant influence on the inconsistency between sap flow and PAR/VPD.【Conclusion】Sap flow in the stems of Eucalyptus was ahead of the change in PAR and VPD and the difference was influenced by soil water content. This finding has an important implication for water and agronomic management.

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