摘要
用热脉冲技术测定了2年生与6年生I-69杨树干液流时空动态的变化与蒸腾耗水量,结果表明:杨树干部液流仅发生在边材部位,同一年轮上各处的流速相近;径向不同位点夜间流速相近,趋于零,而白天变异较大,一般外层流速高于内层,由外向内流速逐渐减低,各处流速都随白天气象因子的变化而波动,整体变化呈现宽峰状曲线。凌晨与傍晚时流速分布出现暂时异常。树干断面流量与日蒸腾耗水量,2年生树分别为3～6L/h与13.6～22.8L,6年生树为20～35L/h与89.2～152.6L。
The dynamics of sap flow in space and time in stem was studied by heat pulse technique in 2- and 6-year-old poplar plantation (Populus deltoides Bartr. cv. 'Lux' ex. I-69/55) in Yinan County,Shandong Province in 1991. The research has revealed that the sap flow occurred in the sapwood of the stem. The sap flow velocity of the same annual ring is similar, but it varied obviously along the diameter direction. The sap flow velocity of the outer ring is higher than that of inner ring in daytime. The sap flow changes with meteorological factors and forms a curve with a widen peak. The quantity of sap flow in stem per hour is 3~6 L/h in 2-year-old tree and 20~35 L/h in 6-year-old tree. The sap flow volume in the stem per day is 13.6~22.8 L/d in 2-year-old tree and 89.2~152.6 L/d in 6-year -old poplar.
出处
《林业科学研究》
CSCD
北大核心
1993年第4期368-372,共5页
Forest Research
基金
国家自然科学基金
中国林科院科学技术发展基金
关键词
杨树
树干液流
heat pulse technique, sap flow, Populus deltoides
