A Study on the Rule of Sap Flow in Camphor Tree and Its Relation to Meteorological Factors
In order to understand and master the mechanism of evaportranspiration of camphor trees aiming at making better use of water,the rule of sap flow in camphor tree was analyzed through the experimental data,which were measured by thermal dissipation sap flow sensor,SF-L sensor in every 30 minutes,combined with the corresponding meteorological factors in the analysis of the rule of the correlations between camphor tree sap flow and meteorological factors was carried out.The results showed that:(1)the sap flow in camphor tree changed timely.The diurnal gross sap flow per unit sapwood in July and August was the highest,then there was a decrease trend since September and it reached its minimum in January,and then rose again till April.It demonstrated a single-peak curve in sunny days and a multimodal distribution or irregular change in overcast and rainy days.The monthly-average diurnal variations reached the highest in July and the lowest in January and went up in March and April.(2)The sap flow velocity of camphor tree in the daytime had a significantly positive correlation with VPD,solar radiation and temperature,and a negative correlation with related humidity while there was no significant correlation with precipitation.At night,the sap flow velocity of camphor tree showed no significant correlation with solar radiation,wheras the correlation with the other factorswas the same as in the daytime.The correlation coefficients turned out to be higher in the daytime than at night,and higher in the growing seasons than in the non-growing seasons.
sap flowcorrelationmeteorological factorscamphor tree
国家科技期刊平台
NSTL
万方数据
维普
