首页|The propensity for heavy metal accumulation in Ulmus pumila L. and its relationship with rhizosphere soil and total suspended particles in Urumqi, Northwest China ☆
The propensity for heavy metal accumulation in Ulmus pumila L. and its relationship with rhizosphere soil and total suspended particles in Urumqi, Northwest China ☆
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NETL
NSTL
Elsevier
Urban populations in arid regions face increasing risks from long-term exposure to heavy metal pollutants. This study investigates the spatial distribution and interrelationships of seven heavy metals (Mn, Ni, Zn, Cd, Pb, Cu, Cr) across soil, elm tree tissues, and total suspended particulates (TSP) in four functional areas-industrial (IA), traffic (TA), park (PA), and residential (RA)-in Urumqi, a typical oasis city in northwestern China. Total heavy metal concentrations in soil were highest in IA (303 mg/kg) and lowest in RA (219 mg/kg). In elm tissues, metals accumulated most in bark and roots, followed by leaves and branches. Cr was predominantly enriched in roots (124.79 +/- 38.76 mg/kg), while Mn and Pb were preferentially accumulated in bark. Cd concentrations in soil exceeded those in other media by up to 38.6 times. In TSP, Cd showed low variability (CV = 6.1 %), whereas Cr exhibited substantial fluctuation (SD = 27.30). A significant root-soil correlation (r = 0.48, p = 0.008) and enrichment factor of 1.37 indicated selective uptake of Cr and Ni. Leaf-branch correlations increased with urbanization intensity, peaking in TA (r = 0.913, p < 0.001). Regression analysis showed that soil concentrations explained 85.9 % of heavy metal content in plants. Sequential extraction revealed residual fractions as dominant across all media. This study provides the first systematic analysis of multi-media (soil, plant, atmosphere) to address critical gaps in understanding organ-specific accumulation and pollution mitigation efficacy of Ulmus pumila L.
NETL
NSTL
Elsevier
