CO_2浓度升高对毛竹器官矿质离子吸收、运输和分配的影响  

Effects of increased concentrations of gas CO_2 on mineral ion uptake, transportation and distribution in Phyllostachys edulis

作　　者：庄明浩[1] 陈双林[1] 李迎春[1] 郭子武[1] 杨清平[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,富阳311400

出　　处：《生态学报》2013年第14期4297-4305,共9页Acta Ecologica Sinica

基　　金：国家林业公益性行业科研专项(201004008);中央级公益性科研院所基本科研业务费专项资金(RISF6915);浙江省省院合作项目(2010SY01)!

摘　　要：为了给大气CO2浓度逐渐升高背景下的毛竹林适应性经营管理提供理论依据,运用开顶式气室(OTCs)模拟大气CO2浓度升高(500、700μmol/mol)情景,以目前环境背景大气为对照,研究了Na+、Fe2+-Fe3+、Ca2+、Mg2+等矿质离子在毛竹器官中吸收、运输和分配的变化规律。结果显示,除CO2浓度700μmol/mol对Ca2+浓度在毛竹器官中大小排序会产生影响外,CO2浓度500、700μmol/mol并未改变毛竹器官中Na+、Fe2+,Fe3+、Mg2+、Ca2+浓度的大小排序。CO2浓度升高对竹叶Fe2+-Fe3+和竹枝Fe2+-Fe3+、Mg2+浓度无明显影响,但对器官的其它矿质离子浓度会有不同程度的影响,竹叶Ca2+和Mg2+、竹枝Na+和Ca2+、竹秆Na+和Ca2+及Mg2+、竹根Na+和Mg2+浓度明显提高,竹叶Na+、竹秆Fe2+-Fe3+、竹根Fe2+-Fe3+和Ca2+浓度明显降低;随着CO2浓度的升高,竹叶Fe2+-Fe3+/Na+、Mg2+/Na+和Ca2+/Na+,竹枝Ca2+/Mg2+及各器官Mg2+/Fe2+-Fe3+、Ca2+/Fe2+-Fe3+均逐渐增大,而竹枝、竹秆、竹根Fe2+-Fe3+/Na+、Mg2+/Na+、Ca2+/Na+和竹叶、竹秆、竹根Ca2+/Mg2+均逐渐减小;CO2浓度升高后除竹根-竹秆SCa,Na、竹秆-竹枝SMg,Fe和竹枝-竹叶SCa,Mg明显下降外,其余的毛竹器官矿质离子向上运输系数变化平缓或明显提高。研究表明CO2浓度升高增强了毛竹立竹根部积累Na+能力和Fe2+-Fe3+、Ca2+和Mg2+的向上选择性运输能力,提高了光合器官竹叶中矿质养分元素浓度,可维持体内矿质养分元素平衡,有利于提高毛竹对高浓度CO2环境的适应能力。In recent years, human activities have caused rapid changes in the atmosphere and climate. In particular, the most important anthropogenic greenhouse gas, carbon dioxide （CO2 ）, has increased from a pre-industrial level of about 270 μmol/mol to a value of 360 μmol/mol reported in 2007. These CO2 levels, which have been increasing since the beginning of the Industrial Revolution, will continue to rise as long as current levels of anthropogenic activity are maintained. In coming years, elevated CO2 levels may alter many aspects of plant production environments. Results on the effects of elevated atmospheric CO2 concentration on plants have already been obtained from some studies, but effects on plant photosynthesis at the physiological and biochemical level remain to be investigated. To provide theoretical evidence to aid adaptive management of bamboo plantations operating under the background of climate change, we studied the effects of simulated increased atmospheric CO2 concentrations on mineral ion uptake, transportation, and distribution in Phyllostachys edulis （moso bamboo）. The open-top chamber （OTC） test method was employed in conjunction with a split-plot design and CO2 concentrations set to 360, 500, and 700 μmol/mol. With the exception of Ca2＋ at CO2 concentrations of 700 μmol/ mol, there was no significant change in ion concentrations （for Na＋, FeE＋-Fe3, Mg2＋, and Ca2＋） with respect to the size of different organs of P. edulis as CO2 concentration was increased. In addition, with the exception of concentrations of Fe2＋- Fe3＋ in leaves and Fe2＋-Fe3＋ and Mg2＋ in branches, which had no significant variation, mineral ion concentrations in various plant organs all changed to some extent with increasing CO2 concentration. In particular, while concentrations of Mg2＋ and Ca2＋ in leaves, Na＋ and Ca2＋ in branches, Na＋, Ca2＋, and Mg2＋ in stems, and Na＋ and Mg2＋ in roots increased significantly, they decreased significantly for Na＋ in leaves, Fe2＋-Fe3＋

关 键 词：毛竹 CO2浓度 离子平衡 选择性运输系数 

分 类 号：S795.7[农业科学—林木遗传育种]