烟草生物炭(TB)单独和与矿物添加剂组合的功效:氢氧化钙(CH),钙基膨润土(CB)和天然沸石(NZ),关于Pb的固定化,Cd,Cu和Zn,通过减少其(生物)对植物的可用性进行了调查。土壤是从铜关污染(TG-C)收集的,丰县重污染(FX-HC)和丰县轻污染(FX-LC)田,陕西省,中国。污染的表层土壤用低成本改良剂处理,施用量为1%,并用大白菜(BrassicacampestrisL.)在温室条件下栽培。结果表明,在FX-LC土壤中,所有改良剂(p<0.05)可能最大程度地降低了DTPA可提取的Pb82.53,Cd31.52和Cu75.0%,而在FX-HC土壤中,Zn含量为62.21%,TB+CH含量高于对照。与未经改良的处理(TBCH除外)相比,添加改良剂明显增加了甘蓝型油菜的干生物量。此外,这些修正案显着增加了植物芽的吸收,即在FX-HC土壤中,单独使用TB的Cd为10.51%,使用TB+CB的Cd为11.51%,同样,在FX-LC中,Cd在TB+CH中增长了5.15%,在TB+NZ中增长了22.19%,分别。在相同的趋势中,TG-C中的TBCH在植物芽中的Cu吸收为19.30%,而FX-LC土壤中TB+NZ为43.90TB+CH和19.24%。另一方面,与对照相比,通过TB观察到植物根部的Cu积累,TB+CH和TB+CB治疗,TG-C土壤中TB+CH的最大吸收量为62.41%。因此,除TB+CH处理外,所有改良剂的叶绿素含量都可能比对照处理增加,由于土壤EC的变化,pH值,但在应用修正剂后增加了CEC值。这个盆栽实验的结果是有希望的,但它们还需要通过长期的田间试验来证实。
The efficacy of tobacco biochar (TB) alone and in combined with mineral additives: Ca-hydroxide (CH), Ca-bentonite (CB) and natural zeolite (NZ), on immobilization of Pb, Cd, Cu and Zn, via reduce its (bio) availability to plants were investigated. The soils were collected from Tongguan contaminated (TG-C), Fengxian heavily contaminated (FX-HC) and Fengxian lightly contaminated (FX-LC) fields, Shaanxi province,
China. The contaminated top soils were treated with low-cost amendments with an application rate of 1% and cultivated by Chinese cabbage (Brassica campestris L.) under greenhouse condition. Results showed that the all amendments (p < 0.05) potentially maximum reduced the DTPA-extractable Pb 82.53, Cd 31.52 and Cu 75.0% with TB + NZ in FX-LC soil, while in case of Zn 62.21% with TB + CH in FX-HC soil than control. The addition of amendments clearly increased dry biomass of Brassica campestris L. as compared with un-amended treatment (except TB + CH). Furthermore, these amendments markedly increased the uptake by plant shoot viz, Cd 10.51% with TB alone and 11.51% with TB + CB in FX-HC soil, similarly in FX-LC Cd increased 5.15% with TB + CH and 22.19% with TB + NZ, respectively. In same trend the Cu uptake in plant shoot was 19.30% with TB + CH in TG-C, whereas 43.90 TB + CH and 19.24% with TB + NZ in FX-LC soil. On the other hand as compared to control Cu accumulation in plant root was observed by TB, TB + CH and TB + CB treatments, while maximum uptake was 62.41% with TB + CH in TG-C soil. Consequently, except TB + CH treatment the chlorophyll content potentially increased in all amendment than control treatment, because of changes in soil EC, pH but increased CEC values after application of amendments. The results of this pot experiment are promising but they will further need to be confirmed with long-term field experiments.