小花南芥与玉米间作对Pb的吸收累积特征

Absorption and Accumulation of Pb with Arabis alpina L. and Zea mays in Intercropping System

该研究选择Pb的超富集植物小花南芥(Arabis alpina L.)与玉米,在Pb污染土壤中进行单作、间作试验,研究小花南芥和玉米在不同种植方式下对Pb的吸收和累积特性。结果表明,小花南芥与玉米间作,显著提高了玉米的生物量,降低了小花南芥的生物量;间作提高了小花南芥根和地上部分Pb含量,由单作的762.11 mg/kg、842.10 mg/kg分别增至834.95、923.15 mg/kg,降低玉米根和地上部分Pb含量,由单作的145.80 mg/kg、90.49 mg/kg分别降低到121.42、73.55 mg/kg。与小花南芥单作相比,间作降低了土壤Pb含量。同时,因为小花南芥的作用,活化了土壤Pb,玉米与小花南芥间作土壤有效态Pb含量显著高于玉米单作土壤,更有利于提高Pb污染土壤的修复效率。

In this study,Arabis alpina L. which is a hyperaccumulator and Zea mays were planted in Pb polluted farmland,in order to explore absorption and accumulation of Pb of Arabis alpina L. and Zea mays in intercropping compared with sole cropping. The results showed that the biomass of Zea mays increased significantly and the biomass of Arabis alpina L.decreased significantly in intercropping. Pb content of Arabis alpina L. in roots and overground increased to 834.95 mg/kg and 923.15 mg/kg respectively in intercropping system,but Pb content was 762.11 mg/kg and 842.10 mg/kg respectively in monoculture system. While Pb content of Zea mays in roots and overground decreased to 121.42 mg/kg and 73.55 mg/kg respectively in intercropping system compared with 145.80 mg/kg and 90.49 mg/kg in monoculture system. Anyway the content of the total soil Pb was reduced in intercropping,but the available soil Pb was raised in intercropping than that of monoculture,because of the effect of Arabis alpina L. which could activate Pb,and this was helpful to improve the remediation efficiency of Pb contaminated soil.