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小花南芥与玉米间作对Pb化学形态及富集特征的影响
王吉秀1, 李想1, 李祖然2, 祖艳群1, 湛方栋1, 秦丽1, 李博1
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(1.云南农业大学资源与环境学院;2.云南农业大学园林园艺学院)
摘要:
间作植物根与根之间的相互作用影响根际土壤理化性质。目前关于超富集植物与作物间作根际土壤pH是否引起Pb赋存形态的变化,不同赋存形态与超富集植物和作物富集Pb的差异机理尚不清楚。本文设置不同Pb处理浓度,小花南芥和玉米间作,单作为对照的土培试验。结果表明:间作小花南芥和玉米地下部和地上部生物量与单作相比显著增加范围为18.59%~181.08%;间作小花南芥根部醋酸提取态Pb,间作小花南芥茎叶、间作玉米根和茎叶中盐酸提取态主要影响Pb富集量;间作显著降低小花南芥根际土壤溶液、根和茎叶中pH,玉米则相反;间作玉米和小花南芥根中pH都与醋酸提取态有关,玉米茎叶与乙醇提取态有关,小花南芥茎叶与氯化钠提取态有关;间作小花南芥富集系数显著增加,玉米显著降低。本文揭示超富集植物小花南芥吸收富集Pb,降低玉米体内Pb是由于间作改变两种植物根际土壤溶液、根和茎叶中pH引起Pb化学形态不同。
关键词:  间作    富集  化学形态
DOI:
投稿时间:2018-03-20修订日期:2018-11-14
基金项目:
Effects of intercropping of Arabis alpina L .var.parviflora Franch and Zea mays L. on chemical speciation and accumulation characteristics of Pb
Abstract:
The interaction between roots and roots of intercropping plants affects the physical and chemical properties of rhizosphere soil. At present, whether the pH in rhizosphere soil of hyperaccumulator and crop intercropping induces the change of Pb occurrence pattern, the mechanism of the difference between different occurrence forms and Pb accumulation of hyperaccumulator and crop is not clear. In this paper, the intercropping of A. alpina and maize under different Pb concentration conditions, soil monoculture as control group. The results showed that intercropping of maize and A. alpina root and aboveground biomass compared with monoculture was significantly increased in the range of 18.59%~181.08%; intercropping A. alpina root acetic acid extractable Pb, intercropping of A. alpina in stems and leaves, intercropping state of the major effect of Pb enrichment extraction hydrochloric acid corn root and stem and leaf in between; for decrease of A. alpina in rhizosphere soil solution, the root and stem of pH in the leaves of maize, opposite; intercropping maize and A. alpina root pH and acetic acid extraction of corn leaf associated with ethanol extractable, A. alpina stems and leaves with NaCl extractable; intercropping A. alpina enrichment coefficient significantly increased, maize significantly decreased. It is revealed that the absorption and accumulation of Pb by the hyperaccumulator A. alpina, and the reduction of Pb in maize is due to intercropping, which changes the chemical form of Pb in rhizosphere soil solution, pH in roots and stems of two plants.
Key words:  Intercropping  Lead  Accumulation  Chemical Form