CO_2浓度升高对美洲商陆富积铯及其根际微生物特征的影响  

EFFECT OF ELEVATED CO_2 ON Cs UPTAKE AND MICROBIAL CHARACTERISTICS IN RHIZOSPHERE SOIL OF Phytolacca americana L.

作　　者：张习美[1,2] 唐世荣[1,2] 宋正国[1,2] 冯人伟[1,2] 

机构地区：[1]农业部环境保护科研监测所生态毒理与环境修复研究中心,天津300191 [2]农业部农业环境与农产品安全重点开放实验室,天津300191

出　　处：《核农学报》2010年第6期1255-1261,共7页Journal of Nuclear Agricultural Sciences

基　　金：国家自然科学基金(40773078)

摘　　要：在开顶式气室(OTC)中采用盆栽试验研究了不同Cs污染浓度(0、100、300、500、1000mg/kg)下,CO2浓度(860μl/L)对美洲商陆(Phytolacca americana Linn.)生物量、Cs富集量及根际土壤微生物的影响。结果表明,与正常CO2浓度相比,CO2浓度升高显著增加美洲商陆地上、地下部分的生物量,其增幅分别为3%～30%和6%～56%;也显著提高了美洲商陆地上、地下部分Cs的含量,最大增幅分别为41%和60%。同时,CO2浓度升高还显著增加美洲商陆根际土壤中细菌、放线菌、真菌的数量,其增幅分别为19%～32%、41%～21%、25%～58%。同一CO2浓度条件下,根际土壤微生物总量与美洲商陆总生物量之间存在显著的相关性。植物生物量、Cs吸收量以及根际土壤微生物量增加,意味着CO2浓度升高有利于利用美洲商陆修复Cs污染土壤。In this paper,we used open-top chambers（OTC） to investigate the effects of elevated CO2（860 μl/L） on biomass,cesium（Cs） uptake and soil rhizosphere microorganisms of Phytolacca americana L.growing on soils spiked with various levels of Cs（0,100,300,500 and 1000mg /kg）.The results showed that compared to the ambient CO2,elevated CO2significantly improved not only the aboveground and underground biomass of P.americana by 3%～30% and by 6%～56%,respectively,but also uptake of cesium in the aboveground and underground of P.americana with maximum increase rate by 41% and 60%,respectively.Meanwhile,elevated CO2 could also significantly increased the number of bacteria by 19%～32%,actinomycetes by 41%～21%,and fungi by 25%～58% in the rhizosphere soils of P.americana,respectively..Under the same CO2 level,a significant correlation was noted between the numbers of microorganisms and total biomass of P.americana.Increasing in plant biomass,Cs accumulation,and rhizosphere microorganism biomass implied that elevated CO2 may be favorable to the use of P.americana for phytoremediation of Cs contaminated soil.

关 键 词：CO2浓度升高 Cs 植物修复 美洲商陆 

分 类 号：S567.239[农业科学—中草药栽培]