Page 25 - 《广西植物》2020年第8期
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              Ecological stoichiometry of lead ̄zinc smelting

                           slags ̄remediation plant ̄litter


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   ZHOU Jiajia ꎬ LUO Youfa ꎬ LIU Mingfeng ꎬ WU Xingyu ꎬ SUN Hang ꎬ WU Yonggui                 1ꎬ2ꎬ3∗
        ( 1. College of Resources and Environmental Engineeringꎬ Guizhou Universityꎬ Guiyang 550025ꎬ Chinaꎻ 2. Karst Eco ̄Environmental
             Engineering Research Center of Guizhou Provinceꎬ Guiyang 550025ꎬ Chinaꎻ 3. Graduate Workstation of Environmental
                      Functional Material and Equipment Research and Developmentꎬ Guiyang 550025ꎬ China )
       Abstract: This study aimed to reveal the nutrient cycling and stability mechanisms in slag ̄plant ̄litter system on the
       metal smelting slags yard for many years of ecological restoration. Five dominant plants (Dysphania ambrosioidesꎬ Arundo
       donaxꎬ Robinia pseudoacacaciaꎬ Broussonetia papyrifera and Cryptomeria fortunei) planted on the lead ̄zinc smelting slag
       which had been ecologically restored for six years in Northwest Guizhou were selected as the objective in this study. The
       contents of carbon (C)ꎬ nitrogen (N)ꎬ phosphorus (P) and their stoichiometric characteristics in the organs of these
       dominant plants (fine rootꎬ coarse rootꎬ stemꎬ branch and leaf)ꎬ floor litter and surface waste slag beneath plants (0-10
       cm) were studiedꎬ and their relationships were also determined. The results were as follows: There were significant
       differences in Cꎬ N and P contents between different plants and different vegetative organs(P<0.05). In the herbaceous
       plantsꎬꎬ the average content of C was stem > leaf > root > litterꎬ and in the three treesꎬ trunk > branch > fine root >
       coarse root > leaf > litterꎬ The distributions of N and P in the herbaceous plants were leaf > litter > root > stemꎬ leaf >
       root > litter > stemꎬ while in the three treesꎬ the distribution of N and P was leaf > fine root > litter > coarse root >
       branch > trunk. C content in litter of Cryptomeria fortunei was higher than that in all organs of othersꎬ but the contents of
       N and P showed an opposite rule. The highest concent of N was found in Robinia pseudoacacia. The change of C ∶ N and
       C ∶ P in organs and litter was contrary to the distributions of N and Pꎬ indicating that C ∶ N and C ∶ P were mainly
       affected by the content of N and P. Correlation analysis indicated that N ∶ P of herbaceous plants was affected by N and
       P. N ∶ P in the three arbor components was mainly controlled by N contentꎬ and also affected by P content in branches
       and leaves. Among the N ∶ P leaves of the five plant leavesꎬ only the N ∶ P of leaves in Robinia pseudoacacia was greater
       than 16ꎬ and the growth in the system was restricted by Pꎬ while the growth of the other four plants were mainly restrict ̄
       ed by Nꎬ indicating that Robinia pseudoacacia is more suitable for the waste residue environmentꎬ it was recommended to
       select legumes as pioneer plants in the restoration of barren waste residue yards to improve the substrate nutrient condi ̄
       tions. The contents of Cꎬ N and P in the waste slag were lower than those in organs and litter of the plant. The contents of
       Cꎬ N and P in the surface waste slag of different plants were significantly different (P <0.05). The contents of Cꎬ N and
       P in the residue under herbaceous restoration were lower than those under the three trees. Correlation analysis between
       Nꎬ P and N ∶ P between waste residue and plant ̄litter showed that the N and P contents in fine roots and litter of plants
       were more closely related to the N and P contents and stoichiometric ratio in the waste residue.
       Key words: lead ̄zinc smelting slagꎬ ecological restorationꎬ plant nutrient organꎬ litterꎬ Cꎬ N and Pꎬ ecological
       stoichiometry


       碳(C)是构成植物生命体的骨架元素ꎬ植物通                         机制中发挥重要作用( Fan et al.ꎬ2015)ꎮ 生态化
   过光合作用吸收同化 C 作为其生理生化过程的重                           学计量学( ecological stoichiometry) 结合了生态学
   要能量来源ꎬ氮( N)、磷( P) 是植物的基本营养物                       和化学计量学的基本原理ꎬ是研究多种化学元素
   质及重要生长限制因子(Elser et al.ꎬ2007)ꎮ C、N、               (C、N、P)质量平衡与生态系统能量平衡间相互影
   P 等基本营养元素在植物生长及其各种生理调节                            响的一 种 理 论 ( 王 绍 强 和 于 贵 瑞ꎬ2008)ꎮ 植 物
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