伴矿景天和鹅掌柴间作系统中根系相互作用对植物生长和镉锌吸收的影响  

Root Interactions and Effects on Growth and Cadmium/Zinc Uptake by Sedum plumbizincicola and Schefflera arboricola in Intercropping System

作　　者：孙曦 李柱[1] 彭洪柳 赵婕 朱仁凤 吴龙华[1] SUN Xi;LI Zhu;PENG Hongliu;ZHAO Jie;ZHU Renfeng;WU Longhua(Key Laboratory of Soil Environment and Pollution Remediation,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China;University of Chinese Academy of Sciences,Beijing 100049,China;Jiangsu Fireflying Environmental Science and Technology Company,Nanjing 210008,China)

机构地区：[1]中国科学院土壤环境与污染修复重点实验室(南京土壤研究所),南京210008 [2]中国科学院大学,北京100049 [3]江苏萤火虫环境科技有限公司,南京210008

出　　处：《土壤》2021年第4期771-778,共8页Soils

基　　金：国家自然科学基金杰出青年基金项目(41325003)资助。

摘　　要：为明确不同物种根系间的相互作用对植物生长和重金属元素吸收的影响,以Cd、Zn超积累植物伴矿景天与花卉植物鹅掌柴为材料,研究二者根系相互作用及对植物生长和Cd、Zn的影响。结果发现,二者根系具有相互抑制生长的作用。单作条件下伴矿景天的Cd、Zn吸收量最高,分别达0.812、19.6 mg/盆;较单作相比,无分隔间作条件下伴矿景天对土壤Cd、Zn吸收降低分别达30.0%和30.6%。两种植物根系改变了土壤养分性质,对土壤钾和磷的利用分别具有竞争和互补作用,但其有效态含量并未降低到亏缺水平,养分竞争可能不是两种植物根系相互作用的主要因素。水培试验表明鹅掌柴根系分泌物对伴矿景天的生长和Cd吸收具有抑制作用。In the current study,a pot intercropping experiment was carried out to study the root interactions between Sedum plumbizincicola and Schefflera arboricola,and the plant growth and cadmium(Cd)/Zinc(Zn)uptake of the intercropping system.When S.plumbizincicola intercropped with S.arboricola,the root-root interaction inhibited the root growth and shoot Cd and Zn uptake of each other.Cd and Zn removal rates of the intercropping system were lower than that of S.plumbizincicola single planting for 30.0%and 30.6%respectively.Soil nutrient properties were changed by the roots of the two plants,and there was competitive and complementary utilization of soil K and P,respectively.Both the concentrations of soil available K and P were not decreased to the deficit level,indicating that nutrient competition may not be the main factor of the root-root interaction of the two species.In a supplementary hydroponic experiment,the root exudates of S.arboricola had an inhibitory effect on the growth and Cd uptake of S.plumbizincicola,indicating the allelopathy inhibition was one of the crucial mechanisms of root-root interaction between the two species likely.

关 键 词：植物吸取修复 间作 伴矿景天 根系相互作用 鹅掌柴 

分 类 号：X53[环境科学与工程—环境工程] S344.2[农业科学—作物栽培与耕作技术]