Application of the penta-needle heat pulse probes to determine the stem sap flow

doi:10.13287/j.1001-9332.201708.035

Abstract

Abstract: It is very important to measure sap flow accurately for investigating water consumption characteristics of trees, plant physiology and eco-hydrology. A new multifunctional digital penta-needle heat pulse probes (PHPP) was selected in this study, which was used to measure the sap flow of the Lobular poplar, in order to test the applicability and reliability of the new penta-needle heat pulse sensors in the measurement of sap flow in comparison with the thermal diffusion method (TDP). The results showed that PHPP can accurately obtain the diurnal variation of the sap flow of the Lobular poplar and the results had statistically significant linear correlation with TDP, with R²being 0.90, root mean square error 2.75 and mean relative error 11%. PHPP could accurately identify low and reverse sap flow, with the thermal parameters being fitted quickly and accurately. It was a promising method to measure sap flow.

Key words: arid region, thermal diffusion probe (TDP), penta-needle heat pulse probe (PHPP), sap flow

DU Meng-ge, WANG Sheng, FANG Jun. Application of the penta-needle heat pulse probes to determine the stem sap flow[J]. Chinese Journal of Applied Ecology, 2017, 28(8): 2438-2444.

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