基于实测白榆蒸腾速率校正计算液流速率的Granier原始公式

doi:10.11707/j.1001-7488.20200617

Abstract

Abstract:

Objective: In this paper,the adaptability of Granier's original formula in estimating the sap flow of Ulmus pumila trunk was verified and the possible error was analyzed,so as to improve the accuracy of estimating the transpiration rate of U. pumila by correcting the Granier's formula. Method: U. pumila was selected as a research object in this paper. The temperature differences of the trunk of U. pumila were measured by thermal diffusion probe method (TDP),and the sap flow velocity was calculated by Granier's original formula. The whole tree container weighing method was used as the verification benchmark. The transpiration rate determined by the weighing method was used as the dependent variable,and the temperature difference coefficient K determined by the thermal diffusion probe method was used as the independent variable. Curve fitting was performed with the data to obtain the Granier correction formula. Result: The daily variation of the flow rate calculated by Granier's original formula was consistent with the measured value of the whole tree container weighing method,showing a "single peak" curve. However,the sap flow rate calculated by the Granier formula was more than 80% lower than the measured value of the weighing method. After the correction of Granier original formula (F_d=0.059 6K^{0.916 4},R²=0.704 9; K is referred to the temperature difference coefficient determined by the thermal diffusion probe method),the difference between the calculated flow rate (F_d) and the gravimetric method was basically maintained between -30% and 30%. The residuals of the U. pumila Granier correction formula were between -2 and +2,indicating that this fitting equation was valid. Conclusion: The sap flow rate of U. pumila calculated by the original formula is significantly lower than the true value of transpiration rate measured by weighing,and thus it cannot accurately express the true transpiration rate and cause a large errors. However,the corrected Granier formula can estimate the true sap flow. Therefore,the corrected Granier original formula should be used to accurately estimate the true sap flow rate of U. pumila.

Key words: Ulmus pumila, sap flow, thermal diffusion probe method, Granier original formula correction

CLC Number:

S718.43

Yujie Ma,Chunyou Li,Pengfei Wu,Changjun Yin,Changming Ma. Correction of Granier's Original Formula Coefficient for Calculating Sap Flow Based on the Measured Transpiration Rate of Ulmus pumila[J]. Scientia Silvae Sinicae, 2020, 56(6): 179-185.

Figures/Tables 9

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编号 No.	树高 Height/cm	胸径 DBH/cm	冠幅 Crown width	边材面积 Sapwood area/cm²
1	310	10.62	190 cm×200 cm	29.15
2	290	10.26	180 cm×195 cm	24.56
3	320	11.20	200 cm×210 cm	30.64

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Correction of Granier's Original Formula Coefficient for Calculating Sap Flow Based on the Measured Transpiration Rate of Ulmus pumila

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