Laboratoire d'Ecologie Alpine, UMR CNRS-UGA-USMB 5553, Univ. Grenoble Alpes, CS 40700, 38058 Grenoble Cedex, France.
Laboratoire d'Ecologie Alpine, UMR CNRS-UGA-USMB 5553, Univ. Grenoble Alpes, CS 40700, 38058 Grenoble Cedex, France; Ecole de la Nature et du Paysage, INSA Centre Val de Loire, 9 Rue Chocolaterie, 41000 Blois, France; CNRS, CITERES, UMR 7324, 37200 Tours, France.
J Hazard Mater. 2017 Jun 5;331:226-234. doi: 10.1016/j.jhazmat.2017.02.056. Epub 2017 Feb 28.
The persistent organochlorine pesticides (OCPs) in soils are suspected to disturb soil biogeochemical cycles. This study addressed the dynamic changes in soil functionality under lindane and chlordecone exposures with or without maize plant. Decreases in soil ammonium concentration, potential nitrogen mineralization and microbial biomass were only OCP-influenced in bulk soils. OCPs appeared to inhibit the ammonification step. With plants, soil functionality under OCP stress was similar to controls demonstrating the plant influence to ensure the efficiency of C- and N-turnover in soils. Moreover, OCPs did not impact the microbial community physiological profile in all tested conditions. However, microbial community structure was OCP-modified only in the presence of plants. Abundances of gram-negative and saprophytic fungi increased (up to +93% and +55%, respectively) suggesting a plant stimulation of nutrient turnover and rhizodegradation processes. Nevertheless, intimate microbial/plant interactions appeared to be OCP-impacted with depletions in mycorrhizae and micro/meso-fauna abundances (up to -53% and -56%, respectively) which might have adverse effects on more long-term plant growth (3-4 months). In short-term experiment (28days), maize growth was similar to the control ones, indicating an enhanced plasticity of the soil functioning in the presence of plants, which could efficiently participate to the remediation of OCP-contaminated soils.
土壤中持久性有机氯农药（OCPs）被怀疑会扰乱土壤生物地球化学循环。本研究探讨了在有或没有玉米植物存在的情况下，林丹和十氯酮暴露对土壤功能的动态变化。土壤铵浓度、潜在氮矿化和微生物生物量的减少仅在原状土壤中受到 OCP 的影响。OCPs 似乎抑制了氨化步骤。有了植物，OCP 胁迫下的土壤功能与对照相似，这表明植物的影响确保了土壤中 C 和 N 转化的效率。此外，在所有测试条件下，OCP 都没有影响微生物群落生理特征。然而，只有在有植物存在的情况下，OCP 才会改变微生物群落结构。革兰氏阴性菌和腐生真菌的丰度增加（分别增加了+93%和+55%），这表明植物刺激了养分转化和根际降解过程。然而，微生物/植物的密切相互作用似乎受到 OCP 的影响，菌根和微/中型动物的丰度减少（分别减少了-53%和-56%），这可能对植物的长期生长（3-4 个月）产生不利影响。在短期实验（28 天）中，玉米的生长与对照相似，这表明在植物存在的情况下，土壤功能的可塑性增强，这可以有效地参与到 OCP 污染土壤的修复中。
