Wang Quan, Awasthi Mukesh Kumar, Ren Xiuna, Zhao Junchao, Li Ronghua, Shen Feng, Zhang Zengqiang
College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, People's Republic of China.
Department of Biotechnology, Amicable Knowledge Solution University, Satna, India.
Environ Sci Pollut Res Int. 2017 Jun;24(18):15645-15654. doi: 10.1007/s11356-017-9212-1. Epub 2017 May 18.
In this study, greenhouse pot experiment was carried out to investigate the Cu and Zn mobility and their accumulations in pakchoi (Brassica chinensis L.) and Chinese cabbage (Brassica rapachinensis L.) growth in Ca-bentonite-pig manure co-compost (CBC)-soil system during three consecutive planting. Five composts (0, 2.5, 5, 7.5, and 10% Ca-bentonite-pig manure co-composts) amended soil with 5% (w/w) application rate and compared to control without any additive. The results showed that the addition of CBC increased the biomass and chlorophyll content of pakchoi, and the maximum overall yield was found in 7.5% CBC treatment (12.89 ± 0.25 g), while when compared with the 0% CBC (15.89 ± 0.52 g) treatment, the Ca-bentonite amendment slightly decreased the Chinese cabbage yield (14.65 ± 0.11-15.41 ± 1.97 g). Additionally, compared to the 0% CBC treatment (11.81 ± 0.57-25.75 ± 0.89 mg/kg), the Ca-bentonite amendments showed a positive effect on restraining the diethylene triamine penta-acetic acid Zn mobilization (4.43 ± 0.41-12.48 ± 2.54 mg/kg) in pakchoi and Chinese cabbage; beside this, no obvious effect was observed on DTPA-Cu. Furthermore, there were great potential impacts for plant-available Zn in Ca-bentonite amended treatments during the consecutive planting, which decreased the content of Zn in plants. DTPA extraction results showed significantly higher Cu and Zn contents in compost-soil mixture, but its availability for grown plant was not confirmed during the consecutive planting, because of the consecutive decrease heavy metals contents in crops. Overall, the Ca-bentonite could be a useful additive for restricting the heavy metal mobility and increase the pakchoi yield.
在本研究中，进行了温室盆栽试验，以研究在连续三次种植期间，钙基膨润土-猪粪共堆肥（CBC）-土壤体系中铜和锌的迁移性及其在小白菜（Brassica chinensis L.）和大白菜（Brassica rapachinensis L.）生长过程中的积累情况。以5%（w/w）的施用量将五种堆肥（0、2.5%、5%、7.5%和10%的钙基膨润土-猪粪共堆肥）添加到土壤中，并与未添加任何添加剂的对照进行比较。结果表明，添加CBC增加了小白菜的生物量和叶绿素含量，在7.5% CBC处理中获得了最高总产量（12.89 ± 0.25 g），而与0% CBC处理（15.89 ± 0.52 g）相比，钙基膨润土改良剂略微降低了大白菜产量（14.65 ± 0.11 - 15.41 ± 1.97 g）。此外，与0% CBC处理（11.81 ± 0.57 - 25.75 ± 0.89 mg/kg）相比，钙基膨润土改良剂对抑制小白菜和大白菜中二乙烯三胺五乙酸锌的迁移（4.43 ± 0.41 - 12.48 ± 2.54 mg/kg）具有积极作用；除此之外，对二乙烯三胺五乙酸铜未观察到明显影响。此外，在连续种植期间，钙基膨润土改良处理对植物有效锌有很大潜在影响，这降低了植物中锌的含量。二乙烯三胺五乙酸提取结果表明，堆肥-土壤混合物中铜和锌含量显著更高，但由于作物中重金属含量持续下降，在连续种植期间未证实其对生长植物的有效性。总体而言，钙基膨润土可能是一种有用的添加剂，可限制重金属迁移并提高小白菜产量。
