氮磷肥施用对保水剂钝化土壤重金属铅镉效果的影响

[目的]探讨氮磷肥施用对保水剂钝化土壤重金属铅镉效果的影响,为揭示土壤水肥保持和重金属污染治理的协调性机制,制定SAP应用技术规程等提供参考。[方法]采用土柱淋溶试验方法,比较添加氮肥和磷肥对SAP钝化土壤铅(Pb)、镉(Cd)效果的影响。[结果]在Pb,Cd复合污染土壤中SAP用量为1.0g/kg时,控氮释磷效果较好,相比无SAP的对照处理,Pb累积淋失量减少5.1%,Cd累积淋失量增加13.6%;氮磷肥添加试验表明,添加氮肥的SAP处理Pb累积淋失量增加76.7%,Cd累积淋失量增加47.6%,添加磷肥的SAP处理Pb累积淋失量减少26.0%,Cd累积淋失量减少20.5%;添加复合氮、磷肥的SAP处理Pb累积淋失量减少2.3%,Cd累积淋失量增加8.3%。[结论]保水剂具有控氮释磷效应,且对土壤中的Pb,Cd有一定钝化作用;氮肥降低SAP钝化Pb,Cd的效果,而磷肥增强SAP钝化Pb,Cd的效果;氮、磷肥复合对SAP钝化Pb的效果影响不显著,但会降低SAP钝化Cd的效果。     

功能性材料对玉米和大豆吸收土壤重金属的影响

通过室内盆栽实验,研究了粉煤灰、沸石、腐殖酸和保水剂等功能性材料对玉米、大豆吸收重金属Pb、Cd的影响。结果表明, 供试功能性材料能有效降低玉米、大豆对重金属污染土壤中重金属Pb、Cd的吸收,复合材料效果优于单个材料,复合材料以粉煤灰+保水剂+腐殖酸+沸石、粉煤灰+保水剂+腐殖酸为最佳。     

施肥对铅镉污染土壤上芥菜铅镉含量及生理的影响

盆栽试验研究了不同化学肥料组合处理对铅镉污染土壤上芥菜(Brassica juncea)Pb、Cd含量及其生理特性的影响。结果表明, 与对照相比, 各肥料处理在显著提高芥菜生物量的基础上, 显著降低了芥菜地上部Cd含量(P<0.05), 其中碳酸氢铵+磷酸二氢铵+硫酸钾处理的效果最佳, 芥菜Cd含量仅为对照的41.0%; 施肥处理提高了芥菜地上部Pb含量, 但Pb没有健康风险; 施肥提高了叶菜的叶绿素含量, 但丙二醛、脯氨酸、细胞质膜透性与芥菜地上部Pb、Cd含量无显著相关性。重金属污染土壤施肥处理是一种值得推广的降低叶菜有害重金属含量的有效技术。     

重金属铅镉对玉米生长及土壤微生物的影响

采用温室盆栽土培方法,研究了土壤中不同浓度重金属铅（Pb,0-800 mg.kg^-1）、镉（Cd,0-50 mg.kg^-1）单一及其复合处理对玉米（Zea mays L.）生长及土壤微生物（细菌、放线菌、真菌）数量的影响。结果表明,在重金属Pb、Cd单一及其复合处理下,玉米的株高、干重均低于对照,重金属Pb、Cd处理对玉米的生长存在负面影响。重金属Pb、Cd单一处理抑制细菌、真菌的生长,中低浓度Pb（≤300 mg.kg^-1）、Cd（≤10 mg.kg^-1）单一处理促进放线菌数量的增加,高浓度（Pb≥800 mg.kg^-1、Cd≥50 mg.kg^-1）则呈现抑制效应;Pb、Cd复合在高中低浓度下都抑制土壤微生物生长,减少微生物数量。玉米株高同土壤微生物之间相关性不显著;玉米干重同土壤细菌、真菌显著相关,同土壤放线菌之间相关性不显著。     

石灰水对混合试剂洗脱土壤重金属淋洗效果的影响

为了探索石灰水对混合试剂(MC)洗脱后土壤中重金属的淋洗效果,对重金属污染土壤进行了盆栽淋洗试验研究。结果表明:石灰水淋洗MC洗脱土壤,淋出液中Cd、Zn、Pb和Cu浓度均显著高于去离子水淋洗MC洗脱土壤,这主要由于石灰水提高土壤pH,释放土壤所吸附的络合态重金属,这种现象在酸性污染土壤中表现更明显。对于酸性污染土壤,可采用MC+石灰水+去离子水依次进行淋洗处理,其Cd和Zn去除率与MC+去离子水+去离子水依次淋洗处理相比提高22.6%和28.8%;对于中性重金属污染土壤,两处理间重金属去除率差异不显著。石灰水淋洗可提高土壤重金属去除率,并提高土壤pH,改善MC洗脱对土壤的酸化,有利于淋洗后土壤的农业利用。     

生物炭对铜矿区污染土壤微生物活性及香根草富集铜、镉、铅的影响

矿区土壤易发生重金属污染,是土地资源利用和维护的一大难题。以铜矿区污染土壤为研究对象,按质量比添加0,1%,2%,4%,10% (w/w)的生物炭,进行香根草室内盆栽试验。研究添加生物炭对土壤pH和微生物活性、香根草富集与转运重金属的影响,探明重金属形态含量与生物炭、微生物活性的相关性,旨在为生物炭与香根草联合修复矿区重金属污染土壤提供理论参考。结果表明:生物炭的添加能提高土壤pH,显著提高土壤FDA水解酶、蔗糖酶和脲酶活性,显著促进土壤基础呼吸,但对土壤微生物量碳无显著影响;生物炭的添加使香根草生物量显著增大,降低土壤Cu和Pb的有效态占比,Cd的变化与此相反;添加生物炭促进香根草对Cd和Pb的富集,降低香根草对Cu的富集,减少Cu、Cd和Pb在香根草体内的转运,因此香根草可作为Cu、Cd和Pb的稳定化植物。土壤蔗糖酶活性与香根草叶片Cu、Cd和Pb含量、有效态和残渣态Cu含量呈显著正相关,土壤基础呼吸与叶片Cu、Cd和Pb含量、有效态Cu、Pb含量呈显著负相关,而与有效态Cd含量呈显著正相关。总之,生物炭可减弱矿区土壤重金属对香根草生长的毒害作用,并促进香根草对重金属的富集,两者结合可改善铜矿区污染土壤的理化性质和微生物活性,有利于重金属污染土壤修复,改善土壤质量。     

铅镉高污染土壤的钝化材料筛选及其修复效果初探

本研究以重金属高污染农田土壤(全Pb含量为1 277 mg/kg,全Cd含量为39.0 mg/kg)为研究对象,通过土培试验和玉米苗期盆栽试验,探讨海泡石、石灰、腐植酸、钙镁磷肥、磷矿粉、生物质炭等常用稳定材料不同剂量及复配组合对高污染土壤重金属的钝化修复效应。土培试验结果表明,石灰对Pb和Cd钝化效果最好,其次是海泡石,但两者表现为较高添加量处理间没有显著差异;而低剂量生物质炭和腐植酸显著增加土壤有效态Pb和Cd含量,高剂量生物质炭具有较好的钝化效果。盆栽试验表明,海泡石与石灰配施钝化效果较好,与对照相比,土壤氯化钙提取态Pb、Cd含量分别降低了97.5%、81.4%;玉米根和地上部Cd含量分别降低48.5%、34.0%,Pb含量分别降低35.6%、29.6%;但海泡石与磷材料配施显著增加玉米根Pb含量,对玉米Cd吸收没有显著影响。以上结果表明,重金属高污染农田土壤添加合适的改良剂,可较大幅度降低土壤重金属有效性和植物重金属吸收性。     

长期化肥配施不同有机肥对土壤和玉米中重金属累积的影响

  【目的】  明确长期化肥配施有机肥对重金属元素在土壤和农作物籽粒、秸秆中积累的影响及其环境效应,为安全高效施肥提供科学依据。  【方法】  在北京市农林科学院新型肥料长期定位试验站进行了为期10年的田间试验,其种植模式为冬小麦–夏玉米轮作,试验处理为不施肥 (CK)、单施化肥 (NPK)、氮磷钾 + 鸡粪堆肥的有机肥料 (NPKJF)、氮磷钾 + 污泥堆肥的有机肥料 (NPKWN)、氮磷钾 + 垃圾堆肥的有机肥料 (NPKLJ) 和氮磷钾 + 秸秆粉碎还田 (NPKJG) 共6个处理,施肥处理依据等氮量施肥原则,每季作物施 N 180 kg/hm2、P₂O₅ 90.0 kg/hm2、K₂O 90.0 kg/hm2。在玉米收获后测定了玉米秸秆、籽粒和0—20 cm耕层土壤中重金属全量。  【结果】  添加污泥处理显著提高了土壤中Cd、Hg、As、Cu、Zn的含量,单因子污染指数分别比对照提高了45.10%、150.00%、104.00%、44.60%、65.80%。不同施肥处理对土壤中全量Cd、Cr、Hg、Cu、Zn存在一定的富集效果。各处理重金属单项污染指数在0.02～0.46,远小于1,综合污染指数为0.23～0.36,均小于0.7,试验区土壤重金属均为无污染等级。施用有机废弃物堆肥的处理玉米籽粒Cd、Cu、Zn含量比对照显著增加,各处理间Hg、As、Cr、Pb、Ni含量差异不显著,连续10年定位施肥后试验站土壤以及玉米籽粒中重金属含量均未超标。同一作物不同部位对重金属的富集能力不同,玉米秸秆对重金属的富集能力大于籽粒。玉米籽粒中Pb、Cu、Zn含量与土壤Pb、Cu、Zn含量存在正相关性,玉米秸秆中Cd、Hg、Cr、Ni含量与土壤中Cd、Hg、Cr、Ni含量呈正相关或者显著负相关。  【结论】  在施氮总量不变的前提下,连续施用供试有机堆肥10年后,土壤重金属含量均未超标,土壤重金属单项污染指数在0.02～0.46,综合污染指数为0.23～0.36,无污染风险。只有污泥堆肥需要加强土壤Cd的监测。玉米秸秆对重金属的富集能力大于籽粒。玉米籽粒中Pb、Cu、Zn含量与土壤相应重金属含量存在正相关性,秸秆中Cd、Pb、Hg、Zn与Cr、Ni含量与土壤中相应重金属含量呈正相关,而秸秆中Cr、Ni含量与土壤中相应重金属含量呈负相关。     

改良剂对烟草吸收土壤中镉铅影响的研究

采用盆栽试验，研究3种改良刺对减少烟草吸收土壤重金属的效应。烟草生长在外源添加重金属达Pb300mg kg^-1和Cd 0.1mg kg^-1的污染土壤上，通过添加3种土壤改良剂，测定分析烟草在不同生长时期不同部位的生物量及重金属含量，探讨3种改良剂埘减少烟草吸收土壤重金属的效果。结果表明：Pb的转移系数小于Cd，说明这两种重金属在烟草体内的迁移能力是Cd〉Pb；与对照处理相比，所有修复剂处理的土壤重金属残留量较多；3种改良剂均在不同程度上减少了烟草不同部位重金属（Cd和Pb）的含量，且增加了烟草的生物量，都起到了一定的改良效果，本试验得到改良剂优劣顺序为：凹凸棒土〉骨粉〉活性炭。     

河北板蓝根产地土壤-植物中镉铅汞砷含量特征及其污染评价

采用野外调查和室内分析相结合的方法,研究了河北省安国市和蔚县板蓝根产地土壤-植物中Cd、Pb、Hg、As含量特征及其在菘蓝中的累积特性,并对板蓝根产地土壤和草药中Cd、Pb、Hg、As污染状况进行了评价,为该地区安全、合理地发展中草药生产提供数据支撑和科学依据。结果表明,安国市和蔚县板蓝根产地土壤中重金属Cd、Pb、Hg、As含量差异不大,土壤重金属含量的变异系数在11.70%~97.65%。以《土壤环境质量标准》(GB 15618—1995)一级标准值进行评价,综合污染指数评价结果显示45%板蓝根种植区土壤Cd、Pb、Hg、As污染等级为警戒限,其他处于清洁水平;而以《土壤环境质量标准》二级标准值进行评价,种植区单项污染指数及综合污染指数结果均0.7,土壤环境清洁。此外,菘蓝地上部(大青叶)Cd、Pb、Hg、As平均含量分别为0.22 mg·kg~(-1)、0.89 mg·kg~(-1)、0.04 mg·kg~(-1)、0.25 mg·kg~(-1),对重金属的富集能力表现为CdHgPbAs;菘蓝地下部(板蓝根)Cd、Pb、Hg、As含量均值分别为0.14 mg·kg~(-1)、0.57 mg·kg~(-1)、0.04 mg·kg~(-1)、0.26 mg·kg~(-1),对重金属的富集能力表现为CdHgAsPb。所有菘蓝样品中Pb、Hg、As含量均未超出《药用植物及制剂进口绿色行业标准》(WM2—2001),大青叶9.09%样品中Cd超标,且Cd平均污染指数0.7,属警戒限污染等级。因此,在中药材GAP(良好的农业规范)产地环境质量评价时,除板蓝根产地土壤完全符合土壤环境质量二级标准外,也不应忽视板蓝根和大青叶吸收和累积重金属的自身特性。     

配施硫基肥对夏玉米镉铅累积的阻控效应

该文以府河流域污灌区农田为研究对象,通过田间小区试验研究了5种施肥措施对土壤重金属镉(Cd)、铅(Pb)有效性以及夏玉米(Zea mays L.)对Cd、Pb富集和转运能力的影响。结果表明:与农民常规施肥(CK)相比,尿素、磷酸二铵和氯化钾配施(N-P-K)以及腐殖酸复合肥、尿素和磷酸二铵配施(HA-N-P)的表层土壤Cd、Pb有效性以及夏玉米对Cd、Pb的富集和迁移能力差异均不显著(P0.05)。然而,腐殖酸复合肥、硫酸铵和磷酸二铵配施(HA-S-P)以及硫酸铵、磷酸二铵和硫酸钾配施(S-P-K)2种施肥措施的表层土壤有效Cd含量分别比CK降低了10.60%和6.36%,表层土壤有效Pb含量分别比CK降低了11.49%和6.00%。此外,HA-S-P处理和S-P-K处理夏玉米Pb转运系数分别比CK降低了50.33%和77.10%,且夏玉米籽粒Pb含量分别比CK降低了59.75%和80.43%(P0.05),但各处理间夏玉米对Cd的转运和富集能力差异并不显著,这说明施用硫基肥可有效抑制夏玉米对Pb的富集和转运,但并未影响其对Cd的富集和转运。综上所述,该污灌区轻度Cd、Pb复合污染农田土壤种植夏玉米建议硫酸铵、磷酸二铵和硫酸钾配施,或者腐殖酸复合肥、硫酸铵和磷酸二铵配施。     

In-Situ Immobilization of Cadmium and Lead by Different Amendments in Two Contaminated Soils

Different soil amendments, including 1% zeolite, 1% bentonite,5% Penghu soil (PHS), 5% Penghu soil + 1% manganese oxide (PHS + MO), 1% MO, and 1.5% silicate slag (SS), were used to immobilize Cd and Pb in two contaminated soils evaluated by single and sequential extractions and by uptake of Chinese cabbage (Brassica Chinensis L.). Results indicated that the PHS and MO significantly (p < 0.05) reduced the 0.1 M HCl extractable Cd and Pb in the two contaminated soils. Allamendment treatments did not change the organic and residual amounts of Cd and Pb in soils A and B, but the PHS andPHS + MOtreatments significantly reduced the exchangeable amounts of Cdand Pb in the two soils as measured by sequential extraction. Thecombination of PHS and MO amendments was associated with ahigh pH value and negative soil surface charge showed the best immobilizing efficiency of Cd and Pb in this study. All soil amendments investigated did not increase the dry matter weight of the plant, and most of them decreased the uptake of Cd and Pb, especially for the PHS and MO. The PHS and MO treatments reduced the extractability of Cd and Pb in two soils and theiruptake by the plant, but only the Pb content in Chinese cabbagefrom the amended soils was less than the background levels of heavy metals in leaf vegetables of Taiwan.     

Effects of Co-Application of Zeolites and Vermicompost on Speciation and Phytoavailability of Cadmium,Lead, and Zinc in a Contaminated Soil

In this study, we investigated, with pot experiments, whether combined application of zeolites and vermicompost is more effective than single application on plant growth and heavy metals’ uptake in a heavy metal contaminated soil. The results showed that co-application of these amendments decreased zinc (Zn) and cadmium (Cd) availability by their redistribution from plant available forms to organic matter and metal oxide associated fractions. While, the addition of vermicompost and zeolites increased the lead (Pb) concentration significantly in the soluble/exchangeable form as compared with the control. Applying vermicompost individually or in combination with zeolites markedly increased plant biomass. Single zeolites and vermicompost reduced Zn and Pb contents of corn roots and shoots compared to un-treated soil, but less compared to the combined zeolite and vermicompost treatments. The results obtained suggest that co-application of zeolites and vermicompost could be an option for immobilizing Cd, Pb, and Zn in heavy metal contaminated soils.     

丛枝菌根真菌对蚕豆秸秆降解及玉米养分和镉铅吸收的影响

  【目的】   丛枝菌根真菌(arbuscular mycorrhizal fungi,AMF) 有利于作物对养分的吸收。在镉、铅污染的土壤中,作物常将镉、铅积累在秸秆中,随着秸秆的还田而释放回土壤。探究前茬蚕豆秸秆还田和丛枝菌根真菌 单施或联合施用对土壤肥力、后茬玉米的矿质养分与镉、铅吸收的影响,为AMF 在调控污染农田轮作体系矿质养分与镉铅累积的生态功能提供新认识。   【方法】   采用四室隔板分室系统进行蚕豆秸秆降解试验,供试土壤和蚕豆秸秆均来源于云南省会泽铅锌矿区污染区,土壤全镉和铅含量分别为4.5和269.0 mg/kg,蚕豆秸秆镉和铅含量分别为1.9和10.9 mg/kg。将蚕豆秸秆粉碎至粒径0.5～2.0 mm装入尼龙袋中,埋于土壤内进行腐解培养试验。玉米盆栽试验设4个处理:污染土壤对照 (CK)、接种AMF菌根 (AMF)、添加蚕豆秸秆 (SI)、接种AMF菌根同时添加蚕豆秸秆 (SI+AMF)。分析AMF对蚕豆秸秆降解、矿质养分 (N、P、K) 与镉铅释放、土壤速效养分含量、玉米生长、矿质营养和镉铅吸收的影响。   【结果】   接种AMF显著提高蚕豆秸秆的降解量、矿质养分和镉铅释放量,促进蚕豆秸秆降解。与AMF处理相比,AMF+SI处理玉米根系的AMF侵染率提高了12%。SI处理显著增加土壤速效养分含量和玉米植株钾含量,降低玉米根部的镉含量,但对玉米株高和生物量没有显著影响。接种AMF、SI+AMF处理显著提高土壤速效氮、磷、钾含量,增加玉米氮、磷、钾含量与吸收量,显著提高玉米株高和生物量,同时显著降低土壤有效态镉、铅含量和玉米植株镉、铅含量。双因素分析表明,接种AMF和添加秸秆对土壤速效氮、磷、钾含量影响显著,但接种AMF对植株矿质元素吸收量、土壤有效态镉、铅含量和植株镉、铅含量作用显著,接种AMF与添加秸秆对各测定指标没有显著的交互作用。   【结论】   AMF能促进前茬秸秆降解、养分和镉铅的释放。接种AMF在提高土壤氮、磷、钾养分含量,降低有效态镉、铅含量,提高玉米对氮、磷、钾的吸收,降低镉和铅在玉米植株内的积累量等方面,均显示出良好的应用前景。虽然接种AMF与秸秆还田没有表现出显著的交互作用,但秸秆还田可增加AMF在玉米根部的侵染率,因此,在使用AMF菌剂时应考虑秸秆还田。     

Phytoextraction of Pb and Cd from a contaminated agricultural soil using different EDTA application regimes: Laboratory versus field scale measures of efficiency

Enhanced phytoextraction of heavy metals using chelating agents and agricultural crops is widely discussed as a remediation technique for agricultural soils contaminated with low mobile heavy metals. In this study, phytoextraction efficiency of Zea mays after single and split applications of EDTA was tested on the laboratory and the field scale. EDTA effectively increased the mobility of target heavy metals (Pb and Cd) in the soil solution. Split applications provided generally lower water-soluble levels of Pb and Cd both in the pot and the field experiment. Therefore, the risk of groundwater contamination may be reduced after split applications. Higher Pb and Cd mobilisation after single applications increased plant stress, phytotoxicity and reduced plant dry above-ground biomass production compared to corresponding split doses. Single doses enhanced plant uptake of Pb and Cd and the phytoremediation efficiency compared to corresponding split doses. Results of plant dry above-ground biomass and heavy metal uptake obtained from the pot experiment could be to some extent verified in the field experiment. Plant uptake of Pb and Cd was lower and biomass production dropped after EDTA additions in the field experiment. Remediation factors in the field experiment were in general significantly lower than in the pot experiment mainly due to the much higher mass of soil per plant under field conditions. This highlights the limitations when going from the lab to the field scale. The low phytoremediation efficiency in the field and the mobilisation of high amounts of Pb and Cd down the soil profile may make the use of EDTA and Z. mays not suitable for the remediation of severely heavy metal contaminated soils in a reasonable time frame and may result in substantial groundwater pollution under used crop management.     

污染土壤上水稻生长及对Pb、Cd和As的吸收

通过温室盆栽试验研究了Pb、Cd和As于中国土壤环境质量标准III级水平(Pb:400 mg/kg;Cd:1.0 mg/kg:As:40 mg/kg)时对水稻在3种不同类型土壤上的生长和吸收Pb、Cd及As的影响.结果表明:在红壤上,As处理的稻谷产量显著降低,除Cd处理对稻谷产量影响不大外,其他处理也明显降低了水稻稻谷产量,且 Pb、Cd 的存在加重了As的毒性;对稻草产量只有Pb和Pb-Cd-As两个处理与对照有显著性差异.在乌栅土上,仅As和Pb-Cd-As处理与对照相比明显降低了稻谷产量,而所有复合处理均降低了稻草产量,且对稻草产量影响要大于其对稻谷产量的影响.在青紫泥上各处理影响较小.Cd-As、Pb-Cd和Pbr-Cd-As处理红壤其稻米Cd含量较Cd单独存在时分别增加了15.7%、11.5%和25.6%;红壤上Pb处理显著增加了稻米Pb的含量.但Pb-As处理降低了稻米Pb含量.稻米中重金属含量在3种不同性质土壤上的含量大小顺序为:红壤>青紫泥>乌栅土.     

Humic Acids Increase the Phytoavailability of Cd and Pb to Wheat Plants Cultivated in Freshly Spiked, Contaminated Soil (7 pp)

Background, Aim and Scope   Humic acids (HAs) are the most important humified component of dissolved organic carbon (DOC) present in sewage water used for irrigation. It is well known that HAs affect the toxicity and availability of heavy metals (HMs) in soil-plant systems, and may increase the human exposure to HMs in contaminated soil through plant uptake. This study was conducted to assess the effects of HAs on HM availability, plant growth and HM uptake. Materials and Methods: With wheat (Triticum aestivum) as a test plant, a greenhouse pot experiment was conducted to investigate the effects of HAs in irrigation water on the phytoavailability of cadmium (Cd) and lead (Pb) in soil. Cd and Pb were added to the soil at concentrations of 1.5 and 150 mg/kg, respectively. Wheat seedlings grown in Cd and Pb-contaminated soil were watered with 4 levels of HA solution (0, 140, 280 and 560 mg/kg of HAs, respectively). Results: In control and Pb treatments, both plant biomass and plant HM concentrations increased with increasing concentrations of HAs in the solution. Plant biomass was markedly decreased when metal concentrations in plants increased, particularly in Cd and Cd/Pb treatments. In the soil, extractable metals, and water soluble organic carbon (WSOC) and its fractions significantly increased with increasing HA concentrations. Discussion: The results suggested that the application of HAs in barren soils may improve plant nutrition by mobilizing soil nutrients and providing plants with carbon sources. On the other hand, HAs present in sewage water may increase both the availability and transfer of HMs in the soil-plant continuum and subsequently increase human exposure to HMs in polluted soil. Conclusions. Conclusions: HA solution as irrigation water significantly increased HM availability to plants cultivated in the HM-amended soil and may increase the environmental risk of sewage irrigation. Recommendations and Perspectives: These results suggested that, when assessing the effect of sewage irrigation on soil quality, HAs contained in sewage water should be taken into consideration.     

间作对不同品种玉米和大叶井口边草吸收积累重金属的影响

采用土壤盆栽试验,研究砷（As）超积累植物大叶井口边草（PteriscreticaL.）与玉米品种云瑞6号（ZeamaysL.Yunrui6）、云瑞8号（ZeamaysL.Yunrui8）、云瑞88号（ZeamaysL.Yunrui88）间作对其吸收积累重金属的影响。结果表明,不同玉米品种对大叶井口边草的生物量都有一定的抑制作用,均不同程度地降低了其生物量。与玉米间作显著提高了大叶井口边草地上部和根部对As、Cd的吸收,同时显著降低了地上部对Pb的吸收,而地下部对Pb的吸收却有明显增加,尤其以云瑞8号的间作效应最显著。与单作相比,间作能显著提高玉米各器官重金属含量,只有云瑞88号的茎中As含量明显降低,由单作的310.89mg.kg-1降低至间作的145.86mg.kg-1。研究初步表明,大叶井口边草与云瑞8号间作可提高修复As、Cd、Pb污染土壤的效率。