不同水肥处理下鸡心果树液流变化特征及其响应机制OA

To investigate the sap flow dynamics of Malus'Jinxiu'and its response mechanisms to environment,3 irrigation amounts of low water(S1),medium water(S2)and high water(S3),and 3 fertilization levels of low fertilizer(F1),medium fertilizer(F2)and high fertilizer(F3)were set up.Sap flow sensors were used to continuously monitor the sap flow rate of X.stenosepala trees.Simultaneously,environmental factors were monitored using a weather station and soil moisture sensors.The results showed that,before irrigation and fertilization,the diurnal variation of sap flow in all treatments exhibited a bimodal pattern,while after irrigation and fertilization,it followed a step-like pattern.The sap flow rate peaked during the fruit expansion stage.Air temperature was the primary factor influencing sap flow.Before irrigation and fertilization,sap flow correlated most strongly with soil water content at a depth of 60 cm;after irrigation and fertilization,the strongest correlation was with soil water content at 20 cm.The ranking of sap flow rates from highest to lowest was:S2F3>S2F2>S3F2＞S1F2>S2F1.Under the same irrigation level,sap flow increased with fertilizer level;under the same fertilization level,sap flow was highest in S2F2 treatment,followed by S3F2 treatment,and sap flow was lowest in S1F2 treatment.In conclusion,while the sap flow variation trends under different water and fertilizer treatments were similar,the differences in sap flow rates were significant.Above results provided scientific basis for improving water and fertilizer use efficiency and optimizing water management in the region.