二氧化碳和臭氧浓度升高对四季竹矿质养分含量和运输的影响  

Effect of Elevated Carbon Dioxide and Ozone on the Mineral Nutrient Content and Distribution and Transportation in Oligostachyum lubricum

作　　者：庄明浩[1,2] 李迎春[1] 陈双林[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江富阳311400 [2]北京大学环境科学与工程学院,北京100871

出　　处：《西北植物学报》2016年第6期1163-1171,共9页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家林业局林业科学技术推广项目([2014]07);中央级公益性科研院所基本科研业务费专项资金(RISF2014006)

摘　　要：为阐明CO_2和O_3浓度升高对竹子矿质养分含量和运输的影响,以2年生四季竹(Oligostachyum lubricum)为试材,采用开顶式气室(OTCs)设置了环境背景大气[CK,(40±5)nmol·mol^(-1) O_3,(360±20)μmol·mol^(-1) CO_2]、O_3浓度升高[EO,(100±10)nmol·mol^(-1) O_3,(360±20)μmol·mol^(-1) CO_2]、CO_2浓度升高[EC,(40±5)nmol·mol^(-1) O_3,(700±35)μmol·mol^(-1) CO_2]、CO_2和O_3浓度复合升高[EOEC,(100±10)nmol·mol^(-1) O_3,(700±35)μmol·mol^(-1) CO_2]4个处理,测定了竹叶、竹枝、竹秆和竹根的Na+、Fe(^(2+,3+)、Ca^(2+)和Mg^(2+)含量,并分析了矿质营养在器官间的转运情况。结果显示:与CK比较,EO处理显著降低了四季竹植株体内Na+和Fe(^(2+,3+)含量,特别是竹根和竹叶,同时也明显降低Na+和Fe(^(2+,3+)器官间的运输能力。EC处理显著降低了四季竹植株体内Na+含量,而未改变其他矿质元素含量,但其器官中的分配格局和运输能力发生变化,尤其是竹枝向竹叶运输Ca^(2+)和Mg^(2+)的能力增强。EOEC处理显著降低了四季竹植株体内Na+含量,但显著提高了Fe(^(2+,3+)、Ca^(2+)和Mg^(2+)含量及其向上运输能力。研究表明,O_3浓度升高降低了四季竹植株体内矿质养分含量和器官间养分运输能力,在一定程度上影响四季竹的正常生长;CO_2浓度升高通过提高Ca^(2+)和Mg^(2+)向光合器官叶片的运输能力,促进四季竹生长;CO_2和O_3浓度升高复合作用能够通过提高四季竹光合器官竹叶中Fe(^(2+,3+)、Ca^(2+)和Mg^(2+)含量及其向光合器官叶片的运输能力,以维持体内矿质养分元素的平衡,提高四季竹对高浓度CO_2和O_3浓度复合环境下的适应能力。To provide theoretical evidence to aid adaptive management of bamboo plantation operating under the background of climate change,we studied the effects of simulated elevated atmospheric carbon dioxide（CO2）and ozone（O3）concentrations on mineral ion uptake and transportation in bamboo.We chose the biennial Oligostachyum lubricum as experiment material,and employed the open-top chambers（OTCs）test method in conjunction with a split-plot design to simulate the different atmospheric and elevated CO2 and O3concentrations,Control[CK,（40±5）nmol·mol^-1O3,（360±20）μmol·mol^-1CO2];elevated O3[EO,（100±10）nmol·mol^-1O3,（360±20）μmol·mol^-1 CO2];elevated CO2[EC,（40±5）nmol·mol^-1O3,（700±35）μmol·mol^-1CO2]and combinations of elevated CO2 and O3[EOEC,（100±10）nmol·mol^-1O3,（700±35）μmol·mol^-1 CO2].Our results showed that,compared with CK treatment,EO treatment decreased significantly the Na^＋and Fe^2＋,3＋concentrations in O.lubricum,especially leaf and root,and the ions transportation ability among organs,while had no changes for the Ca^2＋and Mg^2＋concentrations.EC treatment had no changes in Fe^2＋,3＋and Ca^2＋and Mg^2＋concentrations with the exception of the decrease significant of Na^＋concentration,but enhanced the Ca^2＋and Mg^2＋transportation ability from branch to leaf.EOEC treatment decreased significantly the Na^＋concentration while increased the Fe^2＋,3＋and Ca^2＋and Mg^2＋concentrations and the transportation ability among organs.Based on these findings,we concluded that elevated ozone influenced the normal growth of O.lubricumby decreasing the concentrations of mineral nutrient and transportation ability among organs;elevated carbon dioxide benefited the growth of O.lubricum by enhanced the Ca^2＋and Mg^2＋transportation ability from other organs to leaf;the combinations of elevated ozone and carbon dioxide increased both the mineral nutrient concentrations and its transportation ability from other organs to leaf,and maintained th

关 键 词：四季竹 臭氧 二氧化碳 矿质养分 选择运输能力 

分 类 号：Q945.12[生物学—植物学] Q945.79