Performance Analysis for the Domestic TDP Sensor forM easuring Sap Flow in Trees

Taking who le??tree we ighing method (MBW ) as criterion, and compared w ith sim ilar sensormade by Dynamax (mdTDP) , the performance o f domestic TDP sensor ( cfTDP) were assessed by measuring the sap flow (SF )and transp iration rate (TR ) of Ligustrum leucadendra and Quercus variabilis as testmaterials. The results are as fo llows: ( 1) TheTR o f had good correlation w ith SF derived from the cfTDP method and therew as no sign ificant differ??ence betw een them (P < 0. 05) . The linear correlat ion coefficient betw een the average value o fTR and that ofSF in 30m inutes w as 0. 90 ( n= 215), the maximum was 0. 99 daily. Them ax ima,l m inima l and average values of re lat ive error betw een the to talTR and the totalSF da ily w ere 13. 3% , 0. 5% and 8. 7% respective ly. ( 2) The da ily sap fluxdensity value derived from the cfTDP method had complete consistencyw ith that derived from mdTDP method.