干季核桃树干液流特征及其与气象因子的关系

Stock Sap Flow Characters of Juglans regia and Relationship with Meteorological Factors in Dry Season

Juglans regia is an important economic tree species.Observation of its stock sap flow was carried by SF100 heat pulse recorder in dry season(April-July) in area of conversion farmland for forest and surrounding meteorological factors such as air temperature,air relative humidity and radiation intensity were monitored in-phase.Experimental plot locates in Pingshan,Hebei.This study would offer some references for vegetation restoration.The results showed that the Juglans regia stock sap flow changed obviously between day and night,which followed a single peak type curve.Variation amplitude was big in sunny day and little in cloudy day;In April-May,sap flow was big and little in June-July because of soil water stress;Influencing order on stock sap flow flux by meteorological factors was sun radiation>air temperature>relative humidity respectively.

Juglans regia is an important economic tree species. Observation of its stock sap flow was carried by SF100 heat pulse recorder in dry season（April-July） in area of conversion farmland for forest and surrounding meterological factors such as air temperature, air relative humidity and radiation intensity were monitored in-phase. Ex-perimental plot locates in Pingshan, Hebei. This study would offer some references for vegetation restoration. The results showed that the Juglans regia stock sap flow changed obviously between day and night, which followed a single peak type curve. Variation amplitude was big in sunny day and little in cloudy day; In April-May, sap flow was big and little in June-July because of soil water stress ; Influencing order on stock sap flow flux by meteorological factors was sun radiation 〉 air temperature 〉 relative humidity respectively.