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 

机构地区：[1]Federal Institute North of Minas Gerais(IFNMG),Campus Arinos,MG-202 Road,Km 407,Arinos,Minas Gerais 38.680-000,Brazil [2]Federal Institute of Goiano(IF Goiano),Campus Rio Verde,Sul Goiana Road,Mailbox 66,Rio Verde,Goiás 75.901-970,Brazil [3]Center for Agricultural Sciences,Biological and Environmental,Department of Water Engineering and Soil,Federal University of Bahia Reconcavo(UFRB),Rui Barbosa Street,710,Cruz das Almas,Bahia 44380-000,Brazil

出　　处：《Journal of Forestry Research》2021年第4期1457-1466,共10页林业研究（英文版）

基　　金：supported by the Ministry of Science,Technology,Innovation,Communication(MCTIC);the Foundation for Research Support of Goias State(FAPEG);the National Council for Scientific and Technological Development (CNPq);the Federal Institute Goiano (IF Goiano);the Federal University of B ahia Reconcavo (UFRB)。

摘　　要：The tropical arboreal species Brazilian mahogany(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 combination 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 during 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%.

关 键 词：Heat pulse DIFFUSIVITY Reliability TRANSPIRATION Vapor pressure deficit 

分 类 号：S718.5[农业科学—林学]