Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, Guangzhou, 510642, China; Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing, 100012, China.
Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, Guangzhou, 510642, China; Life Science and Technology School, Lingnan Normal University, Zhanjiang, 524048, China.
Chemosphere. 2021 Jan;262:127718. doi: 10.1016/j.chemosphere.2020.127718. Epub 2020 Jul 22.
A soil microcosm experiment was carried out to quantify the transfer of cadmium (Cd) and lead (Pb) in a multi-species soil system (MS·3). Red earth from Jiangxi (S1), fluvo-aquic soil from Henan (S2), fluvo-aquic soil from Beijing (S3), and black soil from Heilongjiang (S4) were used for soil column packing with S1, S3, or S4 as the 20-50 cm layer and S2, which was Cd- and Pb-contaminated, as the top 0-20 cm layer. For each soil combination, four treatments were set up: CK (no wheat and no earthworm), W (only wheat), E (only earthworm), and E + W (earthworm and wheat). The results showed that the coexistence of earthworm with wheat reduced Cd and Pb contents in wheat plants and earthworms, and increased plant biomass, but had no significant effect on the survival rate and mean weight change rate of earthworms. Total Cd and Pb decreased remarkably in the 0-20 cm layer while increased in the 20-50 cm layer, and approximately 32.8%-51.1% of Cd and 0.35%-7.0% of Pb migrated down into the 20-50 cm soil layers from the 0-20 cm soil layers. The migration varied between the treatments from S2 to S1, S2, and S3. In S2-S1 and S2-S4 columns, the amount of Cd migration decreased when the earthworms coexisted with wheat, while in S2-S3 column, there was no significant difference on such amount regardless of the coexistence of earthworms with wheat. Taken together, the results indicated that the migration of Cd and Pb was not only associated with wheat and earthworm, but also depended on soil types.
进行了一项土壤微宇宙实验，以量化多物种土壤系统（MS·3）中镉（Cd）和铅（Pb）的迁移。江西红壤（S1）、河南潮土（S2）、北京潮土（S3）和黑龙江黑土（S4）用于土壤柱包装，S1、S3 或 S4 作为 20-50cm 层，S2 是 Cd 和 Pb 污染的，作为顶部 0-20cm 层。对于每种土壤组合，设置了四个处理：CK（无小麦和无蚯蚓）、W（仅小麦）、E（仅蚯蚓）和 E+W（蚯蚓和小麦）。结果表明，蚯蚓与小麦共存降低了小麦植株和蚯蚓体内的 Cd 和 Pb 含量，增加了植物生物量，但对蚯蚓的存活率和平均体重变化率没有显著影响。0-20cm 层中的总 Cd 和 Pb 含量显著降低，而 20-50cm 层中的含量增加，约 32.8%-51.1%的 Cd 和 0.35%-7.0%的 Pb 从 0-20cm 土层迁移到 20-50cm 土层。处理之间从 S2 到 S1、S2 和 S3 的迁移情况有所不同。在 S2-S1 和 S2-S4 柱中，当蚯蚓与小麦共存时，Cd 的迁移量减少，而在 S2-S3 柱中，无论蚯蚓是否与小麦共存，Cd 的迁移量都没有显著差异。总的来说，结果表明 Cd 和 Pb 的迁移不仅与小麦和蚯蚓有关，还取决于土壤类型。
