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当前位置: 首页 > 文章 > CO2浓度升高对4种乔木幼树水力结构的影响 生态学杂志 2017,36 (7) 1769-1776
Position: Home > Articles > Influences of elevated CO2 concentration on hydraulic architecture of seedlings of 4 tree species Chinese Journal of Ecology 2017,36 (7) 1769-1776

CO2浓度升高对4种乔木幼树水力结构的影响

作  者：
刘娟娟;张建国;李吉跃;查巍巍
单  位：
中国林业科学研究院林业研究所
关键词：
CO2浓度增加;导水率;比导率;叶比导率;安全性;有效性
摘  要：
以油松(Pinus tabuliformis)、侧柏(Platycladus orientalis)、元宝枫(Acer truncatum)和刺槐(Robinia pseudoacacia)幼树为研究对象,采用改良冲洗法测定不同分枝级和茎段所在区域的水力结构参数,研究CO2浓度升高对4个树种水力结构及水分运输安全性和有效性的影响.结果表明:CO2浓度升高,4个树种在3个分枝级(0、1和2级分枝)的比导率(Ks)和叶比导率(LSC)增加,而侧柏和刺槐在3个分枝的导水率损失(PLC)均下降,油松2级和元宝枫0和1级分枝的PLC下降,其中2级分枝的参数变化最为显著,侧柏、油松和刺槐2级分枝的Ks升高了12.8%、19.6%和51.24%,PLC下降了11.80%、9.6%和51.01%,而元宝枫2级分枝的K和PLC均升高.CO2浓度升高对油松和侧柏非限速区的导水率(Kh)的提高大于限速区,元宝枫和刺槐则相反,而PLC不受CO2浓度升高的影响.高CO2浓度对侧柏和元宝枫提高非限速区Ks和LSC大于限速区,油松和刺槐则相反.4个树种在不同分枝级采取不同的方式来适应CO2浓度的升高,采取的生态策略包括:保持较高的水分运输有效性,同时提高有效性和安全性,和减轻安全性而对有效性的折衷;而在不同茎段所在区域采取保持较高的水分运输效率来适应大气CO2浓度的升高.
译  名：
Influences of elevated CO2 concentration on hydraulic architecture of seedlings of 4 tree species
关键词：
elevated CO2 concentration%hydraulic conductivity%specific conductivity%leaf specific conductivity%hydraulic safety%hydraulic efficiency
摘  要：
Hydraulic architecture parameters with relative ramification rate and in different area stem segments under ambient and elevated CO2 concentrations were measured by improved flushing method.The aims were to study the change of hydraulic architecture,hydraulic safety and efficiency under elevated CO2 concentration.Saplings of four tree species (Pinus tabuliformis,Platycladus orientalis,Acer truncatum and Robinia pseudoacacia) had been exposed to ambient and elevated CO2 concentration for 13 months.The results showed that xylem specific conductivity (Ks) and leaf specific conductivity (LSC) increased in all the ramifications under elevated CO2 concentration.However,the percent loss of hydraulic conductivity (PLC) decreased in P.orientalis and R.pseudoacacia in all the ramifications,and PLC only decreased in branch 2 of P.tabuliformis and in branch 0 and 1 of A.truncatum.Ks increased and PLC decreased in branch 2 of P.tabuliformis and R.pseudoacacia.In P.orientalis,P.tabuliformis and R.pseudoacacia,Ks increased by 12.8%,19.6% and 51.24% in branch 2 whereas PLC decreased by 11.80%,9.6% and 51.01% under elevated CO2 concentration,respectively.The hydraulic conductivity (Kh) of P.tabuliformis and P.orientalis in the non-restricted area were respectively larger than that in the restricted area,whereas Kh of A.truncatum and R.pseudoacacia were respectively smaller than that in the restricted area.However,the PLC was not significantly affected by elevated CO2 concentration.Ks and LSC of P.orientalis and A.truncatum in the non-restricted area were respectively larger than those in the restricted area,whereas Ks and LSC of P.tabuliformis and R.pseudoacacia were respectively smaller than those in the restricted area.Under elevated CO2 concentration,four tree species with relative ramification showed different strategies to adapt to the changed environment.The strategies included:increasing hydraulic safety and hydraulic efficiency,and decreasing hydraulic security to tradeoff the hydraulic efficiency.However,four tree species in different area stem segments showed different strategies,keeping higher hydraulic efficiency to adapt to the elevated CO2 concentration.

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