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.
This paper investigated spatial distribution of Zanthoxylum bungeanum fine roots,which were sampled by excavating monoliths.The results showed that the root length density,surface area,volume as well as biomass were decreased with an increase in depth from 20 cm to 100 cm.The roots mainly distributed in 0～40 cm in the verticality,and the root length density,surface area,volume as well as biomass amounted to 72.0%,65.6%,59.2% and 57.5% of the corresponding total amount.Minimum and maximum of specific root length were respectively exhibited at 0～10 cm and 70～80 cm in the verticality.In addition,the root horizontal distribution reached to 110 cm,however most fine roots distributed within 50 cm and the horizon.And the root length density and biomass accounted for 71.5% and 76.4% of the total amount respectively.The minimum and the maximum of specific root length were exhibited at 10～20 cm and 70～80 cm in the horizon.
