ACTA PHYSIOLOGIAE PLANTARUM
·
2021
·Vol. 43
·期 12
·1-11
·
IF 2.354
Shu Xiao,Zhang KeRong,Zhang QuanFa,Wang WeiBo
Acid rain remains a global environmental issue that can indirectly impact plant root growth and health by mediating soil acidification. The impact of acid rain on the roots of Jatropha curcas L., however, has not been thoroughly evaluated to date in soils with a range of buffering capacities. We, therefore, explored the ability of J. curcas roots to tolerate acid rain in a range of soil types by exposing samples to simulated acid rain (SAR) (pH2.5, pH3.5, pH4.5, pH5.6) and then examining the impact of such exposure on root morphology, relative growth rate (RGR root ), nutrient absorption, enzymatic activity, and microbial biomass. Yellow–brown soil (YBS) and purple soil (PS) were found to be better able to buffer SAR-mediated acidification, thereby providing superior benefits to J. curcas root growth as compared to red soil (RS) and yellow soil (YS) under these experimental conditions. SAR (pH 4.5) significantly enhanced Ca, K, and Mg absorption by J. curcas roots, thereby improving their growth characteristics, whereas SAR (pH 2.5) impaired K and Mg absorption and thus suppressed root growth. K and Mg absorption characteristics were regulated by changes in plasma membrane H + -ATPase activity under these different SAR treatment conditions. Morphological and growth (RGR root ) adaptations of J. curcas roots to SAR treatment were associated with superoxide dismutase activity levels therein. SAR (pH 4.5) was sufficient to bolster the rhizosphere microbial activity of J. curcas seedlings, and correlation analyses revealed that root growth was regulated by rhizosphere microbial biomass P content under SAR treatment conditions.
研究领域:
植物学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Guo Chen,Jun Wu,Jing Ma,Min Xu,Lulu Long,Chao Chen,Xiaohong Zhang,Gang Yang,Chun Song,Yinlong Xiao,Peng Gao,Linling Li
Understanding ciprofloxacin (CIP) sorption behavior onto purple soil is essential to minimize the associated environmental risks. However, CIP sorption onto the different components of purple soil and its underlying mechanisms are poorly understood. We performed a sorption experiment using original purple soils (Dayi soil (D ORI ) and Ya'an soil (Y ORI )), soils without dissolved organic matter (DOM) (D IOM and Y IOM : insoluble organic matter remaining), and soils without organic matter (OM) (D M and Y M : minerals remaining) to explore the CIP sorption behavior. Compared with D ORI and Y ORI , the CIP sorption capacity of D M and Y M decreased by 67.1% and 75.7%, indicating that the CIP sorption capacity was mainly contributed by OM. Compared with D ORI and Y ORI , the CIP sorption capacity of D IOM and Y IOM increased by 17.1% and 12.6%, suggesting that DOM in soil affected CIP sorption in purple soil. Redshifts and blueshifts confirmed that H-bonds and π-π interaction dominated the CIP sorption onto OM. CIP sorption was fitted by the Langmuir model, indicating monomolecular sorption. Compared with D ORI and Y ORI , the K L of D M and Y M was higher, implying that CIP sorption was faster and easier on minerals than on OM. Compared with K + , Ca 2+ had a stronger hydration capacity but lower CIP sorption capacity in D M , suggesting that the stronger hydration capacity of cations was not conducive to CIP adsorption onto minerals and proving that the hydrophobic effect drove CIP adsorption. These mechanistic insights have important implications for understanding CIP sorption in purple soil.
研究领域:
环境科学
·
土壤学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2024
·Vol. 11
·期 6
·2568-2576
·
IF 5.8
Jiameng Liu,Tianchi Cao,Lin Duan,Shengkai Xu,Min Li,Tong Zhang,Wei Chen
Nanoparticulates released from surface soils may significantly affect contaminant fate and transport. Here, we show that nanoscale soil particles can markedly enhance the transport of BDE-209 (one of the most commonly detected polybromodiphenyl ethers (PBDEs) in the environment) in groundwater. Specifically, BDE-209 that is initially associated with three types of soil nanoparticles—including nanoparticles extracted from black soil (Mollisol), purple soil (Inceptisol), and loess soil (Entisol)—remains bound to the nanoparticles when migrating through saturated porous media, regardless of the types of surface coating and heterogeneity (i.e., quartz sand, humic-acid-coated sand, and goethite-coated sand). Accordingly, the mobility of BDE-209 is determined by the mobility of the soil nanoparticles. The nanoparticles of black soils have the highest mobility, whereas those of loess soil display the lowest mobility, because the presence of calcite enhances the deposition of the nanoparticles due to increased particle aggregation and ripening. The coating of humic acid on quartz sand enhances the mobility of all three soil nanoparticles (and therefore, BDE-209) due to increased electrostatic repulsion, steric hindrance, and the blocking of deposition sites, while the coating of goethite subdues the mobility due to decreased electrostatic repulsion and deposition in the primary minimum (i.e., positively charged surface heterogeneity). Findings in this study highlight the important roles of soil nanoparticles in mediating contaminant behaviors and point to the potential risks of PBDE spreading in groundwater, even though the common wisdom is that these chemicals are highly immobile and PBDE contamination is restricted to surface soils.
研究领域:
环境科学
·
污染生态学
·
水文学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）