SF-L probe based on the thermal diffusion method was used to continuously monitor the sap flow of Picea wilsonii and relational environmental factors at the same time in the Xinglong Mountain,including meteorological factors,soil electrical conductivity,soil temperature and humidity,so as to study the relationship between sap flow of P.wilsonii and its related environmental influencing factors during the study period.The results showed that sap flow manifested a single peak curve under different time scales;sap flow start time and peak exsiting time lagged on cloudy days.During the growing season,the total transpiration was 273.79 mm,with the daily transpiration being 1.49±0.71 mm.Nocturnal sap flow existed and was quite significantly related to daytime sap flow.The main environmental factors affecting sap flow on hourly and daily scales were soil electrical conductivity and air temperature,which could ex-plain the change in sap flow by 78.4%and 81.1%,respectively,and vapor pressure deficit was the main environmental factor influencing sap flow on monthly scale,can explain the change of sapflow of 97.3%.
sap flowenvironmental factorthermal dissipation probePicea wilsonii
维普
万方数据
