Uncertainty in sap flow of Brazilian mahogany determined by the heat ratio method

• 作者: Alisson Macendo Amaral Frederico Antonio Loureiro Soares Lucas Melo Vellame Marconi Batista Teixeira
• 来源期刊: 林业研究（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: ORIGINAL PAPERS
• 页码范围: 1457-1466
• 页数: 10页
• 语种: 英文

摘要

The tropical arboreal species Brazilian mahog-any ( Swietenia macrophylla ) is very important economically and ecologically, for which understanding ecophysiological variables such as sap flow will improve understanding of the species and its cultivation. This paper aims to measure uncertainties (U) involved in the application of the heat ratio method for determining sap flow in Brazilian mahogany using sets of heating probes and thermometers installed on plants of 18 months of age, cultivated in Yellow Latosol, under a weighing lysimeter and located in a protected environment. The uncertainty in sap flow was calculated as the combina-tion of uncertainty in the thermal diffusivity ( U k ), conductive section ( U Sc ) and corrected sap velocity ( U Vc ). U k had greater weight in determining the flow of sap in Brazilian mahogany, when compared to U Sc and U Vc . The thermal diffusivity dur-ing the cycle, or period evaluated, must be adjusted to improve the accuracy of the heat ratio method because the sap flow overestimated transpiration by 15.0％. When soil water was optimal In addition, the vapor pressure deficit linearly and indirectly influenced the SF with a difference of 14.6％.