Stem Sap Flow and Water Consumption of Chestnut During Growth Season
[Objective]This study analyzed the characteristics of transpiration water consumption of chestnut(Castanea mollissima Bl.),so as to provide a theoretical reference for the formulation of scientific and reasonable water management measures in chestnut orchards.[Method]The thermal diffusion probe method was used to continuously monitor the stem flow rate of Dabanhong chestnut continuously during the whole growing season from March 1,2022 to March 1,2023,and seven related environmental factors(solar radiation,air relative humidity,air temperature,wind speed,vapor pressure deficit,soil temperature,and soil relative humidity)were observed simultaneously to analyze the stem flow rules and water consumption characteristics of chestnut trees and their correlation with environmental factors.[Result]The obvious stem flow of chestnut trunk started on May 3 and ended on October 26,which lasted for 176 days.The diurnal variation of stem flow rate of chestnut showed a single-peak curve in sunny days during the whole growing season.The daily start and peak time of stem flow rate in June,July and August were earlier than those in May,September and October,while the decline time was later than those in May,September and October,so that the peak duration of stem flow rate in June,July and August was longer than that in May,September and October.The daily average stem flow rate,daily average water consumption and monthly water consumption in the whole growing season of chestnut were ranked from high to low as August＞July＞June＞September＞May＞October,the significance test showed that there was no significant difference between July and August,but it was significantly higher than other months.The nocturnal sap flow percentage was ranked from high to low as October＞September＞May＞June＞July＞August,and the significance test showed that October,September and May were significantly higher than June,July and August.The stem sap flow rate of chestnut during the whole growing season was significantly positively correlated with solar radiation,water vapor pressure deficit,air temperature and wind speed,and significantly negatively correlated with air relative humidity.Six regression models of stem flow rate from May to October and seven environmental factors were established.[Conclusion]The obvious stem flow of chestnut began at the beginning of May and ended at the end of October.The key water demand period of chestnut was July to August.Regression models of chestnut sap flow rate and environmental factors,which could be used to estimate the water requirement of plants in different months and the whole growing season through environmental factors.
国家科技期刊平台
NSTL
万方数据
维普
