樟子松树干茎流日变化规律研究

目的]了解樟子松树干中不同深度不同侧面水分流量的日变化规律。方法]选取5株成年樟子松作为试验材料,利用PT4.2茎流仪测定树干东侧和北侧2.6、3.6和4.6 cm处的水分流量。结果]边材区水分流量从早晨6:30快速上升,9:30左右达到峰值,随后开始下降,白天呈现单峰曲线;边材区深处水分运输启动早于浅处,关闭晚于浅处;4.6 cm处流量比2.6 cm处流量高30%左右,而且峰值明显。结论]樟子松树干东侧和北侧的流量,在不同深度和时间段存在一定差异,但其总流量差异不大;边材区深处流量明显高于浅处。

Daily Variational Rule of Stem-sap Flow in Pinus sylvestris var.Mongolica

Objictive]To study the daily change rule of sap fluxatthe differentdepth and side in trunk ofpinus sylvestrisvar.mongolica.Method]Atotal of 5 growup plants were selected as test material,and the sap fluxin the east and north of trunk at 2.6,3.6 and 4.6 cmposition was determined by PT 4.2 type probe.Result] The results showed thatthe stem-sap fluxof sapwood flowed quickly at 6:30 amand reached the maximum at 9:30 am,and then began to descend.The flux presented a single peak during daytime.The sap flow transited earlier in the deep location than in the shallowlocation,butitclosed later.The liquid flux at 4.6 cmwas higher 30 % than thatat 2.6 cm,and the peak was visible.Conclusion]The sap flux of north and east have variance in different depth and time,but there is little difference in total liquid flux,and the sap flux of deep sapwood is distinct higher than that of shallows apwood.