| 引用本文: | 王城城,叶文伟,赵从举,等.热带桉树树干液流的时滞效应分析[J].灌溉排水学报,0,():-. |
| WangChengCheng,YeWenWei,ZhaoCongJu,et al.热带桉树树干液流的时滞效应分析[J].灌溉排水学报,0,():-. |
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| 摘要: |
| 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连续监测，并同步监测了光合有效辐射（PAR）、大气温度（Ta）、相对湿度（Rh）和0~60 cm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）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；偏相关分析表明，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 min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。 |
| 关键词: 桉树；液流；环境因子；时滞；土壤含水率 |
| DOI： |
| 分类号:S792.39 |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| Time Lag Effect of Stem Sap Flow of Eucalyptus in Tropical Hainan, China |
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WangChengCheng, YeWenWei, ZhaoCongJu, ChenLiYan
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Hainan Normal University
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| Abstract: |
| Abstract: 【Objective】In this study, the time lag effect of Eucalyptus trunk sap flow were test in the growing season. The response of time lag in Eucalyptus to environmental factors was analyzed. 【Method】The sap flow of 6-year-old Eucalyptus trees at Danzhou Forest Farm, Hainan, China, was monitored for 6 months by using a Granier-type thermal dissipation probe (TDP). Photosynthetically active radiation (PAR), vapor pressure deficit (VPD), soil water content (SWC) at a depth of 0-60 cm were monitored simultaneously.The time lags between sap flow density and PAR, VPD was estimated by the cross-correlation analysis.【Result】The results showed that the diurnal courses of sap flow density were “double peak” curve, and there was a photosynthesis depression at midday. The peaking time of sap flow density was ahead of PAR and VPD for 60 min in typical sunny days. Partical correlation analysis showed that there was a significant positive correlation between sap flow density and PAR, VPD (P < 0.001). There were obvious time lags between sap flow density and environmental factors (PAR, VPD) in growing season, which was ahead of PAR and VPD for 30 min and 50 min, respectively. The effect of soil water content (SWC) on the time lag between sap flow density and PAR/VPD reached a significant level(P＜0.05), and when SWC was higher (15.42%), sap flow density was ahead of PAR and VPD for 60 min and 30 min, respectively, while sap flow density was ahead of PAR and VPD for 0 min and 60 min when SWC was lower (10.45%). The time lag between sap flow and PAR/VPD had no significant correlation with the diameter grade (P＞0.05).【Conclusion】There are obvious time lags between Eucalyptus sap density and environmental factors, which is ahead of PAR and VPD. The main factor affecting the time lag is SWC.Comprehensive consideration of the differences between environmental factors can promote the research of Eucalyptus time lag effect. |
| Key words: Eucalyptus; sap flow; environmental factor; time lag; soil water content |
