Estimation of Transpiration Water Consumption Characteristics and Water Consumption per Unit Area of Differ-ent Coniferous and Broadleaf Trees
To investigate the transpiration water consumption patterns of individual coniferous and broadleaf tree species,this study focused on the main afforestation species in Xiong'an New Area,Hebei Province:the coniferous tree Pinus tabuli-formis and the broadleaf tree Catalpa bungei.We used the thermal dissipation probe(TDP)method to monitor the trunk sap flow rates in the stems of both species.Additionally,we measured various tree factors,including crown width,diame-ter at breast height(DBH),crown height,and crown projection area,to analyze the correlation between water consump-tion and these tree factors.The measured tree factors were then fitted to water consumption data to establish equations rela-ting different tree factors to transpiration water consumption.The results showed that:(1)The sap flow rates and daily wa-ter consumption of P.tabuliformis and C.bungei exhibited a single-peaked curve with higher rates during the day and low-er rates at night,regardless of their crown projection area.Overall,as the crown projection area increased,both sap flow rates and water consumption also increased,with the average daily water consumption of C.bungei being higher than that of P.tabuliformis.(2)Water consumption for both species showed a highly significant positive correlation with crown projec-tion area,crown width,and DBH(P＜0.01).The crown projection area had a strong correlation with daily cumulative wa-ter consumption and demonstrated good fitting results.The correlation coefficients for daily cumulative water consumption a-gainst crown projection area were 0.773 for P.tabuliformis and 0.901 for C.bungei,with determination coefficients(R2)of 0.596 and 0.811,respectively.The average daily cumulative water consumption per unit crown projection area for P.tabul-iformis and C.bungei were 0.290 6 kg·m-2·d-1 and 0.302 3 kg·m-2·d-1,respectively.
Pinus tabuliformisCatalpa bungeiSap flow rateTranspiration water consumptionUnmanned aerial vehicle technologyCrown projection area
万方数据
维普
