Studies on Characteristics of Water-consumption for Transpiration of Economic Forest Tree Species

LU Shaowei; DING Jie; LI Shaoning; YANG Chao; ZHANG Dongpo

doi:10.15933/j.cnki.1004-3268.2017.11.020

Abstract：In this study,Ziziphus jujuba,Juglans regia,Crataegus pinnatifida,Armeniaca sibirica,Amygdalus davidiana and Cerasus pseudocerastts were selected to measure the characteristics of water consumption for transpiration of economic forest tree species using the method of potted plants weighing.The results showed that Crataegus pinnatifida,Amygdalus davidiana and Ziziphus jujuba's water consumption were higher than Cerasus pseudocerasus,Armeniaca sibirica,Juglans regia under the condition of sufficient water.The water consumption was respectively (0.090 3 ± 0.002 0),(0.075 5 ± 0.001 7),(0.069 6 ± 0.001 8),(0.046 3 ±0.001 3),(0.041 9±0.000 8),(0.030 8 ±0.000 5) g/(cm2 · d).Crataegus pinnatifida'water consumption was 2.93 times higher than Juglans regia.The water consumption in daytime took up 78％-89％ of the whole day and was significantly higher than that of night.Ziziphus jujuba'daily variation of transpiration rate(Tr) and photosynthetic rate(Pn) were unimodal curve(peak appeared at 11:00 or so),and other species were bimodal curve (peak appeared at about 11:00 and 15:00).Each tree's water use efficiency was highest in the early morning.Tree's photosynthetic rate (Pn) showed highest in July.The relationship of Tr was Crataegus pinnatifida [(3.34 ± 0.92) mmol/(m2 ·s)] ＞ Amygdalus davidiana [(3.22 ± 0.94) mmol/(m2 · s)] ＞ Ziziphus jujuba [(2.94 ± 1.14) mmol/(m2 · s)] ＞ Cerasus pseudocerasus [(2.33 ± 0.84) mmol/(m2 · s)] ＞ Armeniaca sibirica [(2.32 ± 0.77) mmol/(m2 · s)] ＞ Juglans regia [(2.27 ± 0.76) mmol/(m2 · s)].Tr and stomatal conductance (Gs) and photosynthetic active radiation(PAR) had significant linear positive correlation.